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Amphipoda, 268, 286; characters of, 287;

heart of, 287.

Amphisbona, 526.

Amphisbænidæ, 526.

Amphitherium, 627, 641.
Amphitragulus, 686.

Amphiuma, 492, 495, 497.

Amplexus, 166.
Ampullaria, 390, 398.

Anacanthini, 467.
Anaconda, 522.

Anallantoidea, 440.

Analogy, 21.

Anamniota, 440.

Anarthropoda, 240.
Anas, 582.

Anatidæ, 582. 584.

Anatinida, 385, 386.
Anchitherium, 669, 670.
Ancyloceras, 416, 417.
Ancylotherium, 649.
Ancylus, 398.

Andrias, 497.

Androphores, 124.

Anelasma, 291.

Angelina, 282.

Angler, 465.

Anguillula, 231, 232.

Anguillulida, 232.

Anguis, 526, 527.

Ani, 596.

Animals and Plants, differences between,

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Apoda (Cirripedia), 267, 276; (Amphi-

bia), 493; (Fishes), 465, 467.

Apodemata, 263.

Aporosa (Corals), 155, 175.

Appendicularia, 366, 369.

Apsilus, 234.

Aptenodytes, 579.

Aptera, 324, 327.

Apterygida, 572, 574.

Apteryx, 556, 558, 567, 572, 573, 574, 575.
Apus, 39, 280, 297.

Aquiferous system (see Water-vascular
system).

Arachnactis, 146, 148, 171.

Arachnida, 259; characters of, 298; so-
mite of, 298; organs of the mouth of,
299; respiratory process of, 301; distri-
bution of, in time, 310.

Araine, 596.

Araneida, characters of, 308; webs of,
310; distribution of, in time, 310.
Arcade, 381, 385.

Arcella, 63, 64.

Arcellina, 64.

Archæocidaris, 191, 212.

Archaeopteryx, 553, 570, 571, 608, 609.
Archegosaurus, 503.

Architarbus, 310.

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Argonauta, 352, 401; shell of, 408, 409;
reproductive process of, 406, 410; hec-
tocotylus of, 406.
Argonautida, 409.
Aristotle's Lantern, 188.
Ark-shells, 385.

Armadillos, 616, 627, 644, 645, 647.
Arms of Star-fishes, 193; of Ophiuroidea,
196; of Crinoidea, 200; of Comatula,
203; of Cystoidea, 205; of Brachiopoda,
372; of Cuttle-fishes, 401; of Nautilus,
402, 414.

Artemia, 280.
Arthrogastra, 307.

Arthropoda, 240; characters and divisions
of, 258.

Articulata, 258.

Articulata (Brachiopoda), 375, 376.

Artiodactyla, 663, 670.

Arvicola, 715.

Asaphus, 282.

Ascuris, 230, 231, 232, 233.

Ascidians, solitary, social, and compound,

368, 369.

Ascidioida (see Tunicata).

Ascoceras, 416.

Asellus, 289.

A sinus, 668.

Asiphonida (Lamellibranchiata), 385, 386.

Aspidisca, 88.

Aspidorhynchus, 473.

Astacus, 291.

Asplanchna, 236.

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Barbadoes Earth, 75.

Barbel, 466.

Barbets, 598

Barnacles, 271, 272, 274.

Barrier-reefs, 172, 173, 174.

Bascanion, 521.

Basiliscus, 529.

Bathybius, 60.

Bathycrinus, 202, 210.

Batides, 478, 479.

Batrachia, 498.

Bats, 543, 617, 618, 620 et seq.

Beaked Rays, 480.

Bear, 698, 701, 702, 709.

Bear-animalcules, 304.

Bearded Vulture, 607.
Beaver, 714.

Bed-bug, 332.

Bee-eaters, 603, 604.

Bees, parthenogenesis of, 37; communi-

ties of, 342.

Belemnites, structure of, 412.
Belemnitida, 411, 412, 419.
Belinurus, 297.

Bellerophina, 398.

Bellerophon, 398.

Belodon, 537.

Beluga, 473.
Benturong, 705.
Berardius, 661.
Beroe, 170.

Beroida, 170.

Bighorn Sheep, 684.

Bimana, general characters of, 736.
Binomial nomenclature, 29.
Biology, definition of, 1.

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Botaurus, 587.

Bot-flies, 338.

Bothriocephalus, 217, 22).
Botryllus, 363, 367, 369.
Bourgueticrinus, 201.
Bovide, 682, 684, 687.
Bower-birds, 601.
Box-slaters, 289.
Brachiolaria, 195.

Brachiopoda, 349, 350, 351, 354; general
characters of, 370; shell of, 370-372;
arms of, 372; atrial system of, 373;
nervous system of, 374; divisions of,
375, 376; distribution of, in space, 376;
in time, ib.; development of, 375.
Brachiuna, 269.

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Ca ca, intestinal (of Birds), 562.
Caca, pyloric (of Fishes), 455.
Cæciliæ, 492, 494, 495, 505.
Caiman, 535, 536.
Cake-urchins, 188, 190.
Calamaries, 410, 411.
Calamoichthys, 469, 473.
Calcarea (Sponges), 85.
Calcarina, 72.
Calceola, 165, 166.
Calcispongia, 78, 82, 85.
Calice (Corals), 152.
Californian Vulture, 603.
Calling Crabs, 295.
Calling Hares, 713.
Callithrix, 731.

Callograptus, 141.

Callorhynchus, 477.

Calveria, 190, 212.

Calycophoridae, 120; polypites of, ib.;
reproduction of, 122; development of,
ib.; distribution of, 141.

Calyptoblastic Hydroids, 114.

Calyptræide, 394.

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Calyx (of Vorticella), 91; (of Crinoids),

199, 210.

Camelida, 624, 676, 677, 678, 686.

Camelopardalidæ, 677, 681.

Camelopardalis, 681.

Camelus, 677, 678.

Campanularia, 119.

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Chevrotains, 677, 678.

Chigoe, 336.

Chilognatha,

313.

Chilopoda, 313.

Chimera, 477, 478.
Chimeride, 477.
Chimpanzee, 734, 735.
Chinchilla, 714.
Chinchillide, 714.
Chirocephalus, 280.
Chirodota, 209.
Chirotes, 524, 526.
Chiton, 352.

Chitonide, 394.
Chlamydosaurus, 529.
Chlamydotherium, 651.
Chlamyphorus, 647, 648.
Chlorophyll in animals, 13.
Cholapus, 515, 644, 647.
Chondropterigidæ, 457, 475.
Chondrosteida, 473.
Chondrosteus, 485.

Chorda dorsalis (see Notochord).

Chromatophores, 401.

Chrysalis, 325.

Chrysaora, 134.

Clepsine, 247.
Climacograptus, 142.
Cliona, 85.
Clisiophyllum, 166.
Clistenterata, 375.
Clitellum, 248.

Cloaca, of Rotifera, 235; of Insecta, 321;
of Tunicata, 365; of Amphibia, 493;
of Reptiles, 508; of Birds, 563; of Mono-
tremes, 629, 630.

Clotho, 521.
Clupeidae, 466.
Clymenia, 415.
Clupeaster, 184.
Clytia, 34, 110
Chemiornis, 584.
Cnidæ, 100.
Coati, 702.
Cobra, 521.

Coccide, 330, 331.
Coccinellida, 345.

Coccoliths, 74.
Coccospheres, 74.

Coccosteus, 474, 475, 485.

Coccothraustes, 601.
Coccus, 331.
Coccygus, 596.

Cockle, 386.

Cockatoo, 596.

Cockroach, 332, 333.

Cocoon, 326.

Cod, 467.

98;

Chrysochloris, 723.

Chrysopa, 334.

Chub, 466.

Chylaqueous canals (Medus), 127.

Chylaqueous fluid, of Rotifera, 235; of

Annelida, 244, 252.

Chylific stomach of Insects, 321.

Chyme-mass of Infusoria, 89.

Cicada, 331, 332.

Cicindelida, 345.

Ciconia, 587.
Ciconina, 587.

Cidaris, 185.

Cilia, of Sponges, 79; of Infusoria, 89, 91;
of Actinozoa, 143; of Ctenophora, 167,
169; of Echinus, 188; of Annelides,
244.

Ciliata (Infusoria), SS.
Cimex, 332.

Cinclides, 147.

Cimolornis, 583.

Cirrhi, of Annelides, 243, 252; of Cirri-
pedia, 273; of Brachiopoda, 372; of
Lancelet, 458.

Cirrhopoda (see Cirripedia).

Cirripedia, 41, 267; general characters of,

271; development of, 272; shell of,
273, 274; reproduction of, 275; divi-
sions of, 275, 276; distribution of, in
time, 297.

Cirrostomi (see Pharyngobranchii).
Civet, 705.

Cladocera, 268; characters of, 279.
Clamatores, 590.

Clangula, 582

Classification, 23 29.

Clavatella, 110.

Cleodora, 399, 400.

Codonella, 89.

Colenterata, 86; characters of,

thread-cells of, 100; divisions of, 101.

Cœlogenys, 718.

Coenenchyma, 154.

Conccium, 355.

Cœnosare, 103; of Oceanic Hydrozoa,

120;
125.

of Physalia, 123; of Velella,

Conurus, 220.

Coleoptera, 318, 327, 323; mouth of, 319;

characters of, 344; sections of, 345.
Collembola, 329.

Collocalia, 604.

Collosphæra, 76.
Colobus, 731, 732.
Colossochelys, 515.
Coluber, 521, 523.
Colubrina, 521.
Columba, 592.

Columbacei, 590, 593.

Columbida, 593.

Columella, of Corals, 152; of the shells of

Gasteropoda, 392.

Column, of Actinidæ, 146.
Colymbidæ, 580.
Colymbus, 559, 580.
Comarocystites, 205.
Comaster, 203.

Comatula, 202, 203. 209, 211.
Compsognathus, 545.

Conchicolites, 255.

Conchifera, (sce Lamellibranchiata).

Condor, 608.

Condylura, 722.

Comida, 394.

Conirostres, 599.

Conodonts, 485.

Conosmilia, 166, 175.

Contractile vesicle, of Protozoa, 55; of

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