Archive image from page 360 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 GASTEROPODA PULMONEA. 349 We ougpht to arrange near them some Helices which, without having a double-edged cloak, are equally incapable of retreating- within their shell. Helix rufa and brevipes, Ferus., are examples. When the depth of the aperture is greater than its width, as is always the case in shells with an oblong or elon- gated spire, they are the terrestrial/}«///«/of Brug., which it appears necessary to subdivide as fol
Archive image from page 360 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 GASTEROPODA PULMONEA. 349 We ougpht to arrange near them some Helices which, without having a double-edged cloak, are equally incapable of retreating- within their shell. Helix rufa and brevipes, Ferus., are examples. When the depth of the aperture is greater than its width, as is always the case in shells with an oblong or elon- gated spire, they are the terrestrial/}«///«/of Brug., which it appears necessary to subdivide as follows :—The liulimus. Lam., have an oval rim, thickened in the adult, but without denticulations. In tropical countries, there are some large and beautiful species ; some remarkable for the size of their eggs [equal to that of a Pigeon], and with an equally solid shell ; and others for their reversed shells. In our own country there are several of small or moderate size, and one of them (Helix decollata, Gm.) has the singular habit of breaking off in succession the whorls from its spire. This example has been (juoted as a proof that the muscles of the animal can be voluntarily detached from the shell ; for a time does come when this Bulimus preserves no more than a single whorl of all those it possessed at the beginning of the decollation. T\\e Pupa, ham., have an obtusely-pointed shell, whose last whorl is narrower than the penultimate, whence it has an elliptical, or sometimes a cylindrical form. The mouth is surrounded by a thickened rim, and en- croached upon, on the side of the spire, by the penultimate whorl. The species are very small, living in moist stations, amongst mosses, &c. There is sometimes no toothlet in the aperture, but oftener there is one or more either on tlie projecting part of the penultimate whorl, or within the outer margin. [The genera Vertigo, Mull., and Ahca, Jeffreys, appear to have been separated from Pupa on too slight grounds ; for the inferi
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