108 NASSIN^. 



spire elevated, apex acute ; aperture large, oval, emarginate 

 in front ; canal wide, truncated, dorsally more or less 

 tumid ; columella smooth ; inner lip expanded ; outer lip 

 usually thin, smooth internally. 



Ex. B. undatum, Linnaus, pi. 11, fig. 4. Operculum, 

 B. undatum, fig. 4, «, 4, b. Shell, B. undatum, fig. 4, c. 



Spi. Tritonium, 0. Fahr., not Linh. Halia, Macgill., 

 not Bisso. 



The species of Buccinum are not very numerous, and are 

 found chiefly in the polar regions of both northern and 

 southern hemispheres ; the shells of the males are generally 

 smaller and less ventricose than those of the females. 

 The Whelk {B. undatuni) is dredged for the market and 

 vised as bait by fishermen. 



Species of Buccinum. 



acumiuatum, Brod. imperiale, Reeve. 



angulosum, Gray. Labradorense, Keeve. 



boreale. Leach. Lamarck ii, Kien. 



ciliaturO; Fabr. jDyramidale, Reeve. 



cretaceum, Reeve. scalariforme, Bech. 



Dalei, Sow. sericatum, Uancock. 



Donovani, Gray. teuebrosum, Hancock. 



efFusum, Reeve. tenue. Gray. 



glaciale, Linn. tortuosum, Reeve. 



Groenlandicum, Ilancoch. tubulosum, Reeve. 



Ilumphreysianum, Bennet. undatum, Linn. 



bydropbanum, Hancock. Zealandicum, Reeve. 



Sub-fam. NASSIN^. 



Operculum ovate, acute, nucleus apical, the margin 

 entire or serrated. 



The eyes in some of the genera are near the base of the 



