The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . , Cuv., and depilans, Linn.; and the shores of foreigncountries possess several others. The Dolabella, Lam.—Differs only from Aplysia in the position of the branchiae at the posterior extremity of the body, whichresembles a truncated cone. The lateral crest fits close to the branchial apparatus, leaving merely anarrow groove. The shell is species are found in the Mediterranean and in the Indian Ocean. The Notarchus, Cuv.—lias the lateral crests
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . , Cuv., and depilans, Linn.; and the shores of foreigncountries possess several others. The Dolabella, Lam.—Differs only from Aplysia in the position of the branchiae at the posterior extremity of the body, whichresembles a truncated cone. The lateral crest fits close to the branchial apparatus, leaving merely anarrow groove. The shell is species are found in the Mediterranean and in the Indian Ocean. The Notarchus, Cuv.—lias the lateral crests united and covering the back, leaving merely a longitudinal fissure to conductwater to the branchiae. These have no cloak to cover them, but in other respects they resemble thebranchiai of the Aplysia; and the organization of the two genera is otherwise similar. In * The same as the Lamellaria of Montagu, [a name which the Botanists have usurped,] and the Berthellit ot Blaiiiville. [This genus, Pleu-robranch^a. Umbrella, Spirtcella,and Siphonia, are placed in the preceding order by Rang.] GASTEROPODA TECTIBRANCHIATA. 355 fjS^. The Bursatelles, Blainv.,— The lateral crests are united in front, so as only to leavean oval opening for the water to pass to the branchiaewhich are also destitute of a covering cloak. It is, how-ever, probable that this genus should be allowed to lapseinto the Notarchus.* The Aceres, {Akera, Muller)—Ilavethebranchias covered like the preceding genera, buttheir tentacula are so much shortened, widened, and sepa-rated, that there seems to be none at all, or rather theyform together a large, fleshy, and nearly square buckler,under which the eyes are placed. Moreover, their her-^^^^ maphroditism, the position of their sexual organs, thecomplexity and structure of the stomach, the purple liquidwhich several of them shed, all approximate them to theAplysias. The shell, in such as have one, is more or lessconvolute, with a slight obliquity, without a
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
