. Cuvier's animal kingdom : arranged according to its organization. Animals. Fit'. 158.—The Testacella. The Parmacella, Cuv.— Has a membranous cloak, with loose margins, situated [upon a gibbosity] in the middle of the back, and containing, in its posterior part, an oblong flat shell, which exhibits the mere vestige of a spiue. The respiratory aperture, and the anus, are under the right side of the middle of the cloak. The first known species was from Mesopotamia (Par. Olivieri,C\i\.); but we have now one from Brazil, and some others from India. In the terrestrial Pulmonea with a perfect and e
. Cuvier's animal kingdom : arranged according to its organization. Animals. Fit'. 158.—The Testacella. The Parmacella, Cuv.— Has a membranous cloak, with loose margins, situated [upon a gibbosity] in the middle of the back, and containing, in its posterior part, an oblong flat shell, which exhibits the mere vestige of a spiue. The respiratory aperture, and the anus, are under the right side of the middle of the cloak. The first known species was from Mesopotamia (Par. Olivieri,C\i\.); but we have now one from Brazil, and some others from India. In the terrestrial Pulmonea with a perfect and exterior shell, the margin of its aperture is in general thickened and reverted in the adult. Linnaeus referred to his genus Helix,— Every species in which the aperture of the shell (somewhat encroached upon by the projection of the penultimate whorl) assumes a crescent-like figure. When this lunated aperture is wider than it is deep, the shells belong to Helix, Brug. & Lam. In some, the shell is globular. Everybody knows the edible Snail (Hel. pomatia, Linn.), common in gardens and vineyards, and esteemed as a delicacy in some departments ; and the common Snail (Hel. nemoralis, Linn.), remarkable for the vividness and variety of its colours, and very hurtful to garden stuffs in wet seasons. There is no one who has not heard of the curious experi- ments, showing to what extent they can reproduce amputated parts. Other species have a depressed shell, or one with a flattened spire ; and we ought not to pass over without notice such as have interiorly projecting ribs, nor those in which the last whorl is abruptly turned up in the adult [so that the aperture appears in the same plane as the spire], and then assumes an irregular plicated form,—hence denominated Anastoma-\ by Lamarck. The Vitrina, Drap. (Helico-Limax, Feruss.), are Helices with an extremely thin subspiral shell, without an um- bilicus and with an ample aperture, whose margin is sharp and even. The body of
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