ODOSTOMIA CONOÏDEA, Brocchi, sp. (Turbo). Station VII. Logs 3, 9, 11, 12, 18, 21, 28, 31, 33, 42, 50, [55]; depth, 4 or 7 to 808 fathoms. This species, the type of the genus Odostomia, is well represented in the dredgings. Var. AUSTRALIS, Jeffreys. Log 33. A single specimen. Although I am quite convinced of the propriety of subdividing the group of shells which Jeffreys included in the genus Odostomia, none the less do I agree in the main with his last remarks on the subject which appeared in the "Porcupine" Reports. Far too great value has been placed upon solitary characters, such as the presence or absence of sculpture or of columellar fold. I have specimens of Pyrgulina indistincta, Montagu, from Salona Bay, Greece, showing gradations from typically sculptured shells, to others quite smooth. In some species, e.g., Eulimella commutata, Monts., the columellar fold is very variable as to its presence or absence. Obviously, then, characters such as these, which are not of specific value, cannot furnish bases for generic subdivisions when taken alone. But the peculiarities of the fold and sculpture, when taken in conjunction with other characters, as the form of the shell, the conformation of the apex, the sinuation of the outer lip, afford good ground on which to build. 0. CONSPICUA, Alder. [Station VII.] Logs 30, 33. Young specimens only. O. UMBILICARIS, Malm, sp. (Turbonilla). Log 42. A single specimen. I strongly suspect that this species is little more than a local variety of the next. 0. ACUTA, Jeffreys. Station VIII. Logs 9, 11, 28, 42. O. PLICATA, Montagu, sp. (Turbo). Logs 35, 62, E. 0. TURRITA, Hanley. Logs 6, 28, 35, 63. Var. NANA, Marshall. O. UNIDENTATA, (Montagu), auct. Logs 11, 17, 21, 22, 28, 33, 34, 55, 63, D; depth, 10 or 20 to 808 fathoms. Montagu's Turbo unidentatus apparently included the present and at least one other species, Brachystomia eulimoides, Hanley. In his remarks Montagu notes that the shell has usually a tinge of purple, or rose colour at the tip, and mentions that it was obtained alive on Pecten maximus from deep water. Being acquainted with the latter fact, he must have found eulimoides, the form which so usually is associated with the Pecten: the apex of the species under consideration has only a dull bluish colour, whilst eulimoides is always tinged with either orange or rose. It is worth noting that Turton, Fleming, Macgillivray, Martin, and Véramy all identified the species associated with Pecten as Montagu's unidentata. BRACHYSTOMIA EULIMOIDES, Hanley, sp. (Odostomia). Stations II., VIII. Logs 28, 31, 33, 63, A. Var. RISSOIDES, Hanley, var. (Odostomia). Logs 6, 25, 35, E, F. Var. ALBELLA, Lovén, var. (Turbonilla). Log 6. Some years ago I ventured to affirm that Clark was right in uniting these forms. Since then I have examined very many examples of the various forms and am still further confirmed in my opinion. [B. SUBOBLONGA, Jeffreys, sp. (Odostomia). Log 37, Mr. Nichols fide Mr. J. T. Marshall]. SPIRALINA, nov. gen. (non Spiralina, Gümbel, 1862, Spirolina, Lam., 1804). S. SPIRALIS, Montagu, sp. (Turbo). = Station VIII. Logs 6, 9, 11, 12, 17, 18, 22, 28, 33, 34, 35, 55, 63; depth, 4 to 110 fathoms. This species is a member of a group of closely allied forms widely distributed. Its affinities are all with the Brachystomia group, from which it differs in being sculptured with strong, straight, longitudinal costæ abruptly terminated (or in some forms abruptly reduced in size to thread-like strix) at the periphery by the first of a series of spiral stria which encircle the base. JORDANIELLA, nov. gen. J. NIVOSA, Montagu, sp. (Turbo). Log 6, 25, F. This species is remarkably rare in the material examined. The Turbo nivosus of Montagu and the Odostomia truncatula of Jeffreys belong to a very distinct group for which I suggest the name Jordaniella. Mr. Jordan's name is appropriately associated with O. truncatula, he being the first to recognize its peculiarities. ONDINA DIVISA, J. Adams, sp. (Turbo) = Odostomia insculpta, auct. Logs 6, 9, 12, 18, 22, 28, 33, 34, 35, 42, 63; depth, 4 to 79 fathoms. The specific name divisa ought unquestionably to be adopted: Adams' description, brief as it is, applies perfectly to the present species and to it alone. Gray's generic name Auriculina (1847) was preoccupied by Gratel in 1838. Consequently De Folin's Ondina, 1870 stands. O. DIAPHANA, Jeffreys, sp. (Odostomia). Logs 6, 12, 22, 25, 33; depth, 5 to 521 fathoms. 0. Warreni, Thompson, sp. (Rissoa). Station VIII. PYRGULINA INTERSTINCTA, Montagu, sp. (Turbo). [Station VI.] Logs 6, 12, 28, 33, 34, 35, 63, A; depth, 4 to 55 fathoms. Montagu's type, judging from his description and measurements, is evidently the small slender form which Jeffreys called the variety suturalis, supposing it to be the Rissoa striata, afterwards R. suturalis, of Philippi. The more robust form which Jeffreys took as his type may perhaps be recognized in Brown's Jaminea obtusa, in which case the form should be called var. obtusa, Brown. Both forms occur in the dredgings. P. DECUSSATA, Montagu, sp. (Turbo). Station VI. Logs 6, 25, 26, 33, 35; depth, 4 to 52 fathoms. P. INDISTINCTA, Montagu, sp. (Turbo). Station VIII. Logs 3, 9, 11, 12, 28, [33], 39, 42, 63, 70, 73; depth, 7 to 80 fathoms. The majority of the specimens are broader than the type form, with more convex whorls and finer sculpture. They differ from the var. brevior, Jeffreys, in their large size. In the material from logs 12, 39, and 42, there occurred specimens of a remarkable form perhaps referable to the present species. The shells are small, the largest measuring only 2.2 mm. the longitudinal ribs are stronger than those of indistincta, the spiral striæ are three only in number on the body whorl, two on each of the upper whorls. The whorls are flattened. There is no trace of a columellar fold. Its apex is bluntly truncated like that of indistincta and not small and oblique like that of clathrata which latter species it closely resembles in sculpture. None of the numerous specimens of indistincta approach it. The two forms appear quite distinct. I have specimens of this puzzling form from the Mediterranean. It appears to be distinct from both indistincta and clathrata, but until a good series can be obtained, it may be considered a variety of the former and designated var. SIMULANS. LIOSTOMIA CLAVULA, Lovén, sp. (Turbonilla). Logs 9, 11, 12, 18, 21, 22, 28, 34, 42, 55, 63, 64, depth 5 or 6 to 79 fathoms. This species, usually accounted a rarity, occurred in surprising abundance, especially in the dredgings. from the mouth of Kenmare River. The great majority of the specimens are of the form of Lovén's type which has not been recorded, so far as I am aware, from British waters. His description and the dimensions (4 mm.) agree entirely with my observations of these shells. There are, however, a few examples of a form so unlike the type that they would assuredly be considered specifically distinct did not intermediate gradations occur. This varietal form, which has the peculiarities of ordinary British specimens markedly exaggerated, deserve a special name, and I would suggest as a suitable appellation— Var. ROBUSTA, var. nov. Shell having the form of a truncated cone, instead of being almost cylindrical, of thicker texture than the type, with a larger umbilicus, and a sub-angulated periphery. Height 1.5 mm. Breadth 75 mm. NEMIA DOLIOLIFORMIS, Jeffreys, sp. (Odostomia). Log 28. Two or three broken specimens. TURBONILLA LACTEA, Linné, sp. (Turbo). Logs [33], 50, E. Remarkably rare. Linné's name may perhaps stand, although it is noteworthy that the Marquis of Monterosato rejects it. T. PUSILLA, Phillippi, sp. (Chemnitzia), non Odostomia pusilla, Jeffreys. Station VIII. Log 42. This, like the former species, is only represented by a fragmentary specimen or two. Var. LACTOIDES (Monterosato MS.). This form, characterised by its regularly conical outline and broad base, represents one extreme of a series, at the other end of which is T. delicata, Monterosato. Every intermediate gradation exists between the two. Like so many other common and widely ranging species T. pusilla varies greatly, and to attempt to separate the more marked varieties as distinct species is both unscientific and confusing. EULIMELLA SCILLE, Scacchi, sp. (Melania). Stations [VII], VIII. Logs 21, 33; depth, 40 to at least 370 fathoms. Eulimella is, as Professor Verrill has pointed out, scarcely worthy of separation from Turbonilla. Both typically have the same microscopic spiral striæ and all other characters in common. Turbonilla differs only in its longitudinal ribs. These are absent on the lower whorls in some species, and are wanting on the upper half of the shell in a form I have from Delos. They consequently form a poor character on which to base a genus. E. COMMUTATA, Monterosato, 1815. = acicula, Philippi, 1836, non Lamarck, Logs 9, 11, 12, 16, 22, 26, 28, 33, 42, 50, 53, 55, 63, 70; depth 7-120 fathoms. The specimens found exhibit a good deal of variation in their characters. Var. VENTRICOSA, Forbes v. Logs 17, 18, 20, 33, 53; depth, 524-110 fathoms. No intermediate specimens occurred connecting the variety and type. These appear to have become distinct in the district investigated. They are easily and completely connected in certain other British areas. E. NITIDISSIMA, Montagu, sp. (Turbo). Station VIII. Logs 6, 15, 25, 40, 62. Very rare in the dredgings examined. PYRGOSTELIS INTERRUPTA, Totten, sp. (Turbonilla). [Station III.] Logs 18, 30, 42. A few fragmentary examples. P. SCALARIS, Philippi, sp. (Melania). Log 6. A single broken specimen. Var. RUFESCENS, Forbes, v. Log 50. |