So GENERA OF SHELLS. 



of its whole length : the last whorl being but little 

 larger than the preceding one, the shell has the form of 

 an elongated pyramid: surface generally striated or 

 tubercular and sometimes varicose. 



C. giganteum, palustre, sulcatum, telescopium, ebeninum, 

 nodulosum, vulgatum, obeliscus, granulatuni, aluco, echina- 

 tum, erythraeonense, muricatum, radula, crassum, decolla- 

 tum, obtusum, seniigranosum, asperum, lineatum, vertagus, 

 fasciatum, subulatum, hétéroclites, zonale, seniiferrugineuni, 

 torulosuui, tuberculatum, morus, ocellatum, litteratum, atra- 

 tum,eburneum, punctatum, lima, perversum, — muscarum, 

 septemstriatum, ferrugineum, dislocatum. 



Pleurotoma. Shell either turreted or fusi- 

 form ; terminated inferiorly by a straight canal 

 more or less elongated. Lip at its upper part 

 having a fissure or emargination. 



P. imperialis, auriculifera, muricata, echinata, flavidula, 

 interrupta, crenularis, cincta, unizonalis, lineata, spirata, 

 fascialis, bimargiuata, buccinoides, cingulifera, virgo, baby- 

 lonia, undosa, marmorata, tigrina, crispa, albina, nodifera. 



TuRBiNELLA. Shell turbinated or subfusi- 

 form, channelled at base. Columella with three 

 to five compressed, transverse plaits. 



Distinguished from voluta by the canal at the base 

 of the aperture : h'om murex by having no varices, 

 and from fasciolaria by the direction of the folds on 

 the columella. 



T. scolymus, rapa, napus, pyrum, pugillaris, rhinoceros, 

 cornigeraj ceramica, capitellum, mitis, globulus, leucozona- 

 lis, rustica, cingulifera, polygona, carinifera, infundibulum, 

 craticulata, lineata, nassatula, triserialis, variolaris, ocellata. 



