SIGARETUS. 



TESTA suborbicularis, subauriformis, depressa, 

 spira submarginali, vix prominula. Apertura 

 Integra, dilatata, altitudine latitudinem su- 

 perante ; marginibus supern^ disjunctis : labio 

 interne brevi, spiraliter intorto* 



A Genus of internal shells, which we judge from the 

 slight acquaintance we have with it, to helong to the 

 same family with Lamarck's Bullcea, Aplysia, and Dola- 

 hella, hut placed hy him in the Macrostomes^ near to Ha- 

 liotis, evidently on account of its general form and its 

 dilated aperture. As far as the differences in the shells 

 themselves warrant it, our opinion is decidedly against 

 the separation of Blainville's Cryptostoma from this Ge- 

 nus ; nor do we think the animals sufficiently different to 

 render the propriety of separating them very clear. 



In general form, the Sigareti are rather orhicular, 

 ear-shaped, and depressed, mostly with a nearly marginal, 

 scarcely prominent, sometimes very compressed spire. 

 The aperture is entire, much dilated, longer than wide ; 

 its edges disunited at the upper extremity, owing to the 

 outer lip embracing in its increment the lower part of the 

 last volution, of which there are two or three at most : 

 inner lip short, spirally twisted, in general a very little 

 reflected at its upper part, hut sometimes so much so, as 

 to form a small umbilicus. Two muscular impressions 

 may generally be traced, one at the upper and the other 

 at the lower extremity, and rather within the mouth. 



The Sigareti are marine; only a few species are 

 known, none of them inhabitants of our coasts. Adanson 

 arranged them with Haliotis 3 from which, however, they 



