Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 ACHATINA.—ONCHTDIUM. 41 to lodge the entire animal {jig. 26): the shell is thin and translucent, and obtains its name from a supposed resemblance to amber: they live upon plants that grow along the margins of rivulets and brooks. 19. The genus of ACHATINA {jig. 27) is composed of Fi^. 26. large snails, which, AMBRETTE. in Warm countries, feed on shrubs; they have an oblong shell with the opening wider than it is high, without a thickened lip, and truncate
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 ACHATINA.—ONCHTDIUM. 41 to lodge the entire animal {jig. 26): the shell is thin and translucent, and obtains its name from a supposed resemblance to amber: they live upon plants that grow along the margins of rivulets and brooks. 19. The genus of ACHATINA {jig. 27) is composed of Fi^. 26. large snails, which, AMBRETTE. in Warm countries, feed on shrubs; they have an oblong shell with the opening wider than it is high, without a thickened lip, and truncate at the extremity of the colu- mella, a disposition somewhat analo- gous to that of the shell of most ma- rine gasteropods. 20. The family of Pulmonea AauATiCA have but two tentacles {jig. 18, page 33); their mode of respiration obliges them to come fre- quently to the surface of the water to breathe : they cannot keep at great depths, and they ordinarily live in fresh waters, or near coasts. 21. As in the preceding family, we find here mollusks without a shell, and others that are provided with one: the first form tho genus of Onchidiinn {fig. 28), which have a very straight and very extensible elongated body; they inhabit the fresh waters of
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