QENUS XXIII. VOLUTA. 107 



other genus of Univalves contains several species that have 

 teeth on the pillar lip, this becomes very indeterminate and un- 

 certain. Many of the Buccina in Linnaeus's second division, 

 as tuberosum, Testiculus, &c. have very conspicuous teeth on 

 the pillar : so also have some of the Strombi, as Chrragra, &c. ; 

 and many among- the Murices, as Tritonis, Tulipa, &c. ; also 

 several among the Trochi, as dolabratus ; and Turbo, as JJva ; 

 also Helix, as Scarabceus ; and Nerita, as grossa, &c. 



There are not many of the animals known, but the few that 

 are, vary very considerably from one another (see Adanson). 



The lines and marks are denominated the same as in other 

 spiral shells. 



Linneeus describes 46 species, Gmelin has added 96, Dr. 

 Turton 2. Total, 144. 



Linnasus makes five divisions. 



The 1st, Apertura integra, 



2nd, Cylindroidece, 4th, Fusiformes, 



3rd, Ovatce, 5th, Ventricosce. 



Perhaps the last division may not improperly be considered 

 as the true Voluta. They seem to be sufficiently different from 

 the rest, and from every other genus, to be esteemed a genus of 

 themselves : in these the pillar is twisted with oblique folds ; the 

 last whorl is very large, bearing no proportion to the others; the 

 aperture broad, with a hollow at the end furthest from the spire ; 

 outer lip thin, margin acute ; spire often covered, or nearly so, 

 with the outer whorl. The animal is very remarkable ; the foot 

 is so large, that the shell covers only about one-fourth part of 



p2 



