TUREITELLA.— Plate IV. 



Banks' Turkitella. Shell pyramidally tui-reted, thick, 

 rather swollen and obtusely angled at the base, whorls 

 fifteen in number, very minutely granulously reticu- 

 lated throughout, concave, encircled with a middli' 

 ridge and other irregular smaller ones, rounded at the 

 lower edge, sutui-es indistinct, columella peculiarly 

 produced in a twisted manner, aperture somewhat 

 square; ash-olive, mottled with black and white, 

 ridges articulated with black. 



Gray, MSS. Brit. Mus. 



Ilab. Panama (dredged from sandy mud at the depth of 

 ten fathoms) ; Cuming. 

 A solid pyramidal sheB in which the whorls are convex 

 in the middle, rounded at the lower edge, and encircled 

 with neatly articulated ridges, one of which is central and 

 prominent. 



