104 TRITONIIDiE. 



obscurum, Reeve. sculptile, Reeve. 



parvura, C. B. Adams. siphonatum, Reeve. 



pictum, Reeve. Sowerbii, Reeve. 



pygmoeum, Zam. tessellatum, Reeve. 



Quoyi, Reeve. testaceum, Bon. 



reticulatum, Blainv. tortuosum, Reeve. 



rude, Meusch. truncatum, Hinds. 



scalariforme, Brod. verrucosum, Reeve. 



Sub-gen. lagena, Klein. 

 Shell ventricose, thin ; whorls rounded, varices obsolete. 



cancellatum, Lam. rostratum. Mart. 



clandestinum, Chem. Wiegmanni, Anton. 



Gregonense, Say. 



Sub-gen. argobuccinum, Klein. 



Shell ventricose, solid ; whorls rounded, varices few ; canal short ; 

 outer lip dentated internally. 



rude, Brod. scabrura, King. 



Genus DISTORSIO, Bolten. 



Shell subturreted ; whorls distorted ; aperture irregular, 

 contracted, ringent ; canal recurved ; inner lip dilated, 

 lamellar, rugosely indented ; columella excavated, verru- 

 cosely plicate ; outer lip sinuous, internally plicato-dentate. 



Syn. Persona, Montf. Distorta, ScJium. Distortrix, 

 LinJc. 



Ex. D. cancellina, Deshapes^ pi. 11, fig. 2. Operculum, 

 D. anus, Linnaeus, fig. 2, a, 2, b. Shell D. anus, fig. 2, c. 



These remarkable shells are at once recognised by the 

 ringent aspect of their mouths, from which circumstance 



