. Cuvier's animal kingdom : arranged according to its organization. Animals. The Bursatelles, Blainv.,â The lateral crests arc united in front, so as only to leave an oval opening for the water to pass to the branchifc which are also destitute of a covering cloak. It is, how- ever, probable that this genus should be allowed to lapse into the Notarchus.* The Aceres, {Akera, Muller)â Have the branchiae covered like the preceding genera, but their tentacula are so much shortened, widened, and sepa- rated, that there seems to be none at all, or rather they form together a large, fleshy, and nearly
. Cuvier's animal kingdom : arranged according to its organization. Animals. The Bursatelles, Blainv.,â The lateral crests arc united in front, so as only to leave an oval opening for the water to pass to the branchifc which are also destitute of a covering cloak. It is, how- ever, probable that this genus should be allowed to lapse into the Notarchus.* The Aceres, {Akera, Muller)â Have the branchiae covered like the preceding genera, but their tentacula are so much shortened, widened, and sepa- rated, that there seems to be none at all, or rather they form together a large, fleshy, and nearly square buckler, under which the eyes are placed. Moreover, their her- maphroditism, the position of their sexual organs, the complexity and structure of the stomach, the purple liquid which several of them shed, all approximate them to the Aplysiae. The shell, in such as have one, is more or less convolute, with a slight obliquity, without a visible spire, and the mouth has neither sinus nor canal ; but as the Fig. ! Leaciiii. columclla is coHvcx and protubcrant, the mouth has a crescent-like shape, and the part opposite to the spire is always widest and rounded. When the shell is buried in the cloak, ]M. de Lamarck names the genus BullÅa. The shell has few whorls, and is too small to contain the animal. The Biilltca aperta. Lam., is an example which is found in almost every sea, where it lives on oozy bottoms. "When the shell is [external], covered with a thin epidermis nnd sufficiently roomy, 51. de Lamarck allows them to retain the old name Bulla. The Bulla Ufinaria, ampulla, and /ii/datis are examples, [distinguished not only by the characters of the shells, but by peculiarities in the armature of the stomach, which two or three roniparatively laro;e osseous pieces or jaws of different shapes in each. Of those of B. lignaria, Gioeni constituted a genus to which he assigned ^":â i/'"-âBuii^aiiperta. his own name ; it is the Tr
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Keywords: ., bookcentury1800, bookdecade1840, bookpublishe, booksubjectanimals
