268 PYRAMIDELLID^. 



presenting such perceptible marks of distinctness from 

 all except unidentata (and Its sculpture seems to forbid 

 its annexation to that polymorphous shell), that we are 

 unwillino- to omit it, although almost equally averse to de- 

 scribing a new species from a single and not fully charac- 

 terised example. 



It is of a produced conical figure, strong, shining (per- 

 haps from attrition), and of a snow-white hue ; the princi- 

 pal whorls are very minutely, but distinctly, encircled 

 throughout with closely disposed regular spiral striulae, 

 which becoming rather stronger upon the base of the body- 

 whorl cause the intervening spaces to assume the appear- 

 ance of fine and depressed costellae. There are at most 

 only five volutions, which rapidly taper to a blunt apex 

 (not, however, a flattened one as in insciilpfa), are more or 

 less high, of quick longitudinal increase, and not planulate, 

 but a little convex : they become a little more rounded, 

 perhaps, above the profound Impressed sutural line. The 

 body is subangulated at its periphery ; its basal declination 

 is rather gradual, and more or less flattened. There is no 

 trace of an umbilicus. The mouth is oval-acute, and 

 occupies two-fifths of the total length of the shell ; no 

 sculpture is apparent upon the throat, but the lip, which 

 is straightish above, does not seem fully formed, hence the 

 internal smoothness may not be constant. The pillar-lip 

 seems moi*e or less straight, and is appressed and not much 

 reflected. The fold is strong, subcentral, and distinct. 

 The length, which is rather more than double the breadth, 

 is only the tenth of an inch. It came from Northumber- 

 land. 



