The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . ACEPHALA TESTACEA. 375 NucuLA, Lain.—Has the teeth of the hinge in a broken Hne. 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 pre-ceding genus. For a long time we have placed here the Triyonioi, Brug., so remarkable for their hinge, which isfurnished with two plates en chevron, crenulated on both surfaces, and each penetrating into twocavities, or rather bet
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . ACEPHALA TESTACEA. 375 NucuLA, Lain.—Has the teeth of the hinge in a broken Hne. 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 pre-ceding genus. For a long time we have placed here the Triyonioi, Brug., so remarkable for their hinge, which isfurnished 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. Quoi and Gaymard 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 huge, truncate, and hooked at its anterior part. The recent Trigoniai resemble the Cockles in thefigure of their shell, and in the manner in which it i
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
