GENUS XXV. STROMBUS. U5 



The shells of the last division, of which Linnaeus describes only 

 four, together \\i\\\ S. Oniscus, can scarcely be said to have 

 an additional hollow ; at least, if they have any, it is very ob- 

 scure ; whereas it is very large and conspicuovis in most of the 

 species. The mouths of the tapering Strombi agree very nearly 

 ^\iVa some of the tapering 3Inrices. 



I cannot find that the animals of these shells are described 

 bv any author except Adanson, and he only takes notice of 

 that of one species, which he says is almost like the animal of 

 the Mw'ices ; but as Strombus Gigm is so common a shell, 

 most probably the animal is known to many. 



Linnaeus has described 29 species, Gmelin has added 23, 

 and Dr. Turton 2. Total, 53. 



Lamarck has divided tliis genus into three, as follow : 

 Strombus. Shell ventricose ; the base terminating in a short 

 hollow or truncated canal ; the right lip enlarges with 

 age into a wing, entire or with only one lobe, having at 

 the lower part a hollow or groove distinct from that at 

 the base (see Strombus pugilis, f. 85). 

 Pterocera. Shell ventricose ; the base terminating in a 

 lengthened canal ; the right lip dilating with age into a 

 digitated wing, and having a hollow groove near the 

 base (see Strombus Lambis, f. 86). 

 RosTELLARiA. Shell fusiform; the base terminating in a 

 canal like a sharp beak ; the right lip entire or toothed, 

 more or less dilating with age into a wing, and hav- 

 q2 



