. Le royaume des animaux : organisé après son organisation ; formant une histoire naturelle des animaux et d'introduction à l'anatomie comparée. Zoologie. et l'un ou dix, Décapodes armés de seiche. Le Ocfopod tribu se compose des deux familles Testacea NxtcUi^nd v ; à l'ex appartient au genre Argonauta, Mth (peut-être) le genre fossile Bdlerophon ; à ce dernier le genre Octopus, représenté dans la figure précédente (2) que le rampage sur la rive avec sa bouche vers le bas. La tribu des Décapodes, qui comprend la plus grande proportion de l'actuel Cephalopoda, est di- visée en quatre familles ,-le Teut

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. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. and the Decapod a, or ten-armed Cuttle-fish. The Ocfopod tribe consists of the two families Testacea v^nd NxtcUi; to the former belongs the genus Argonauta, mth (perhaps) the fossil genus Bdlerophon ; to the latter the genus Octopus, represented in the preceding figure (2) as creeping on the shore with its mouth downwards. The Decapod tribe, which includes the greater proportion of the existing Cephalopoda, is di- vided into four families ;—the Teuthida: or Calamaries, including the genera Loligo, Sepioteuthis, Chiychoteuthis, Sepiola, Cranchia, and Loli- gopsis (Fig. 3) ; the Sepiadcc, or common Cuttle-fish, comprised under the single genus Sepia ; the Spindidw, consisting of the single genus Spirula, which is a Decapodous Cephalopod, with an internal spiral chambered shell, furnished wth a siphon ; and the Belcmnitida:, a group known only by fossil remains, but determined from these to have been Decapodous Cephalopods, possessing conical chambered shells of which a description has been given in the text. From cer- tain markings on the surface of these shells, and from the fact that distinct remains of an ink-bag have been frequently met with in the last or largest chamber of the cone, it has been argued that, not. withstanding the strong resemblance of the shell to that of many genera allied to the true Nautilus and belonging to the Tetrabrati- chiate group, the animal must have been Dibranchiate, and must have included the shell, together with its massive sheath, in the same manner as the Cuttle-fish includes the "pounce-bone." The Nau- tilus possesses no ink-bag, its power of completely withdravidng the body into its shell rendering such a means of protection unneces- sary ; and the ink-bag seems to be wanting in the several fossil Fig. 3 loliooi'sis. genera, whose shells bear a strong resemblance to that

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• bookauthorwe
• bookcentury1800
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• booksubjectzoology