CASSIDULUS. 81 



Sub-gen. siPHO, Klein (Atractus, Agassiz. Fusus, Lam. 

 Tritonofusus, Bed). 



Shell thin ; canal produced and recurved. 



Islandica, Chem. pygmaea, Gould. 



latericia, Gould. ventricosa, Gray. 



pulla, Reeve. 



Genus CASSIDULUS, Hurapluey. 



Operculum solid, claw-like, nucleus apical. 



Shell pyviform, solid ; spire short, nodulose, spin}' ; 

 aperture oval, oblong ; canal short, open ; columella smooth ; 

 outer lip simple. 



^yn. Galeodes, Bolten. Melongena, Schum. Mancinella, 

 Mus. Berl. 



Ex. Casper, Martini, pi. 9, fig. 1. Operculum, C. 

 asper, fig. 1, a, I, h. Shell, C. melongena, Linnaus, 

 fig. 1, c. 



In this genus the head of the animal is greatly elongated, 

 with the tentacles at the end ; there is, however, no ros- 

 trum, but a retractile proboscis ; the tentacles are small, 

 and the eyes are sessile at their outer bases. The Cassiduli 

 are found chiefly in the Eastern Seas ; a few, however, are 

 from Mexico, the West Indies, and California. 



S])ecies of Cassidulus. 

 melongena, Linn. patulus, Brod. and Soiv. 



VOf.. I. Jw 



