102 UNIVALVES MUREX. 



Fuscatus — Clouded. Xuberculatus — Tuberculated. 



Tor ulosus — Ringed. Gibbosus — Gi b bous. 



Radiila — Rayed. Atratus — Blackish. 



Asper — Rough. *Contrarius — Reverse. 



Granulatus — Grained. Eburneus — Ivory. 



*Decolatus — Decapitated. Conditus — Mottled Oil-jar. 



Molluccanus — Molucca. Clava — Club-shaped. 



Minimus — Small. Hexagonus — Hexagonal 



^trigilatnS'—Strigilated. *Minutissimus — Minute. 



TROCHUS.—Top-Shell. 



Animal — aLimax: Shell univalve, spiral, more or less co- 

 nic; aperture somewhat angular or rounded , the upper 

 side transverse and contracted; pillar placed obliqneli/. 



This genus contains one hundred and thirty-three spe- 

 cies. The leading characteristic consists in its conical 

 shape, which prevails with few exceptions throughout 

 the genus: some, however, are so nearly allied to the 

 Turbo, that frequent mistakes arise in their classifica- 

 tion. 



Among those Trochi which have their pillar perforated 

 or umbilicated, may be mentioned the T. niloticus, T. ma- 

 culatus, T. perspectivus, T. Hybridus, and T. Pharao- 

 nis. 



Though some of this genus have their surfaces almost 

 smooth, yet the greater number are covered with knobs, 

 spines, tuberculations, or undulations, of which the T. So- 

 laris, and T. imperialis, are striking examples : the former 

 has its margin beset with long spines, placed at regular 



