Tritonia varicosa, Purpura picfa. 365 



Seven or eight striae on the lower extremity, and none on the 

 upper. 



Icon. tab. xiii. fig. 6. 



Mus. nost. 



7. Tritonia varicosa. 



Testa co7iica, albida rufo maculata^ varicibus subtribus albis : 

 anfractibus 7, planiusculis, decussatis : apertura purpuredy 

 utrinque dentata ; columella extus alba. 



Shell conic, whitish with rufous marks, with two or three white 

 varices: volutions seven, flattish and decussate : aperture purple, 

 toothed on each side ; pillar white externally. 



Length six-tenths of an inch; breadth four-tenths. 



Our notice was first attracted to this species, by Mr. Griffith. 

 They are dredged up in a particular spot in Torbay, always pre- 

 serving their exact character as distinct from Tr. macula^ which 

 is never found with it. All the varieties of the latter species have 

 the throat white, with a dark purple spot in the centre of the 

 base. 



We have ventured to change the generic name of Lamarck, 

 from Triton to Tritonia^ the former appellation having been given 

 by Linne, to a family of naked moUusca. 



Icon. tab. xiii. fig. 7. 



Mus. nost. Griffiths. 



8. Purpura picta. 



Testa ovato'oblonga, nitidd, albida lituris ochraceis : anfractibus 

 8, decussatis: labro Icevi. 



Shell oval oblong, glossy, whitish with ochraceous blotches ; 

 volutions eight, decussate : outer lip smooth. 



Length four-tenths of an inch; breadth hardly two. 



Some of this species we dredged up in the British Channel. 

 From the pointed termination of the pillar, they appear to belong 

 to this genus rather than to Buccinum or to Fusu'^. When 



