The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . —Area ACEPHALA TESTACEA. NucuLA, Ilas the teeth of the liingc in a broken Ihie. The form of the shell is elongated and narrowed towardsthe posterior end. We do not know the animal, but it is probably not much unlike that of the pr(;-ccding genus. For a long time we have placed here the Trii/onict, Drug., so remarkable for their hinge, which i»furnished with two plates en chevron, crenulated on both surfaces, and each penetrating into twocaviti
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . —Area ACEPHALA TESTACEA. NucuLA, Ilas the teeth of the liingc in a broken Ihie. The form of the shell is elongated and narrowed towardsthe posterior end. We do not know the animal, but it is probably not much unlike that of the pr(;-ccding genus. For a long time we have placed here the Trii/onict, Drug., so remarkable for their hinge, which i»furnished with two plates en chevron, crenulated on both surfaces, and each penetrating into twocavities, or rather between four plates of the opposite side, similarly crenulated on their internal sur-faces. From the marks on the inside of the valves we inferred that the animal had not tubes, of anylength at least; and MM. Quni and Oaymard having discovered it alive, we find, in fact, that, likethe Arcacea;, it has an open cloak without any separate orifices, not even one for the anus. Its footis large, truncate, and hooked at its anterior part. The recent Trigoniae resend)le the Cockles in thefigure of their shell, ami in the manner in which it
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1840, booksubjectanimals
