250 ROSTRIFERA. 



fabula, Soiv. Nussatula, Linn. 



festivus, Chem. pertusus, Hwass. 



glans, Hicass. spectabilis, J. Adams. 



granulatus, Linn. strigatus, Hwass. 



hieroglyphicus, Bud. tendiueus, Hwass. 



luteus, Brod. terebra, Born. 



mitratus, Hwass. vimineus, Reeve. 



nucleus, Reeve. violaceus, Reeve. 



Genus BIBAPHUS, Philippi. 



Shell involute, subcylindiical, covered with a thin epi- 

 dermis ; spire acute ; aperture narrow, linear, abruptly 

 truncate in front ; columella simple ; inner lip none ; 

 outer lip thickened, rectilinear, and abbreviate anteriorly. 



Ea^. D. edentulus, Swainson, pi. 26, fig. 7. 



The only species of this genus known was considered 

 by Swainson to be a toothless species of his genus Co- 

 nalix, and by Reeve it has been considered a Cone. The 

 general form and truncate columella resemble Terehellum, 

 and were it not for the absence of plaits it might be 

 regarded as a Cylindra. 



Sub-order ROSTRIFERA. 



Head moderate, with a more or less elongated, pro- 

 duced, contractile, transversely-annulated rostrum ; ten- 

 tacles subulate, far apart, on the sides of the rostrum. 

 Lingual membrane often very long, extending far into the 

 body of the animal. 



The rostrum is only furnished with contractile muscles, 

 and varies in length and shape ; in Struthiolaria it is 

 very long and conical-subulate, but it is not retractile. 



