Most probably some will be found to correspond with the Tennessee fish, as ours were chiefly obtained in North Mississippi, near Oxford, and not remote from the Tennessee line. One species of the Chologaster, at least, has been taken in Adams and other southern counties of the State. An undescribed species of the Lepidosteus, or Alligator Gar, not yet seen by Prof. Agassiz, has been obtained, and a specimen about three feet in length is preserved in the collection of the Rev. Benjamin Chase, of Natchez. The Taxidermist, who procured and preserved it for Mr. Chase, named it the black gar, in contradistinction to the other species which are not so dark. In general form and appearance of the head and body, it resembles the L. spatula nearly. The distinctive characteristic of the species is found in the biordinate disposition of the rows of scales, which range in opposite directions from the extremities, those from the posterior end taking a direction contrary to that in other species; and the rows from the head and tail meeting about midway of the body, gives the line of junction a zigzag, or serrated appearance. For this species I propose the name of the accomplished and zealous cultivator of Natural History, who possesses it. It is, therefore, added to our catalogue, and will be known as the Lepidosteus Chaseii, of Wailes. Doubtless our catalogue of the fishes of the southwest will hereafter be much enlarged. INVERTEBRATA, Class L—MOLLUSCA, OR SHELL-FISH. Of this class my observations enable me to give but little more than a catalogue of the family Unionidse, or fresh-water mussle, and this is as yet imperfect. Our collections embrace the following species:— Remarks.—Of our list of Uniones, the Mississippiensis and Porrectus are newly determined species, and have been figured and described by Conrad, in the Journal of the Academy of Natural Sciences. The trapezoides is the most common and widely dispersed species. The purpuratus (Ater, or lugubris), Anadontoides (or teres), and the Silliquoides are abundant. Of the Univalves, we have the Paludina, Lymnsea, Planorbis, and Melania, Succinea. The paludina only is found in any abundance. The melanias appear to be very rare. The lymnaea and succinea occur in the fossil state, associated with the helices in the mastodon bone-beds. Helices, or Snails. Among those now found living, Those found fossil, are— I enumerate the following:— Helix albolabris. Helix alternata. concava. auriculata. elevata. fraterna. profunda. hirsuta. perspectiva. interna. palliata. pulchella. Sayi. tridentata. thyroides. helicina. CRUSTACEANS. Our collection in this department is yet very limited. I enumerate at present only the following:— SCIENTIFIC NAME. POPULAR NAME. Loligo punctata. Cuttle fish. Polyphemus occidentales. Horse-foot crab. Lupa dicantha. Common edible crab. Gelasimus vocans. Fiddler crab. Ocypode arenaria. Small sand-crab. SCIENTIFIC NAME. Pagurus longicarpus. Pseudocarcinus mercenaria. Cambarus leprosus, ? Agaz. "fluviatilis. "fossor. Peneus setiferus. POPULAR NAME. Hermit crab. Sea prawn, or shrimp. Class II—ARTICULATA, OR INSECTS. Class III.—EADIATA—STAR-FISH, ETC. These classes of the Invertebrata must, for the present, be wholly omitted. VII. FLORA. A Systematic and comprehensive catalogue of the Botany of the State cannot, with propriety, be undertaken until the close of the survey. At present, only a popular and familiar synopsis of some of the most useful and ornamental of our trees and plants will be attempted, without regard to classification or arrangement in a scientific form. I. FOKEST-TKEES. POPULAR NAME. Apple, crab "white It u Candleberry, Cherry, Cucumber-tree, Chestnut, Chinquepin, Cottonwood, SCIENTIFIC NAME. Pyrus coronaria. "accuminata. "spicta. "pumila. |