ODOSTOMIA. 263 



0. coNSPicuA, Alder. 



Not pure white ; whorls more or less rounded ; throat with 

 raised spiral crena3 ; fold very strong. 



Plate XCV. fig. 6. 



Odostomia unidentata, Hanley, Brit. Marine Conch, p. xxxv. f. 11. 

 „ conspicua. Alder, Trans. Tyneside Nat. Club, 1850. 



Of this shell we have only seen a single good specimen ; 

 hence we cannot but entertain some doubts not alone 

 as to what features must be regarded as of permanent 

 specific value, but even as to its distinctness from the pre- 

 ceding shell. 



The few individuals we have examined, are of a fulvous 

 or livid flesh-colour, and in general aspect greatly resemble 

 aeufa, but are larger, stronger, and with rounder volutions. 

 Of these, which are eight in number, the body or final 

 turn is not so angulated at the periphery as in acuta, and 

 its basal slope is less sudden ; hence, too, the mouth, 

 which is moderately large and nearly oval, is rather more 

 produced at the base. The pillar lip is less-reflected and 

 less strongly arched ; the fold is rather above the middle of 

 the inner lip ; the umbilicus is not so distinct. The chief 

 peculiarity, however, rests in the throat, which is furnished 

 with a somewhat remote series of raised crena3, which are 

 not produced, as in conoidea, into spiral lyrse. Three lines 

 and a half was the length of the largest specimen, which 

 measured a line and a third across at the base. 



Dredged in deep water off Whitburn ; Douglas, Isle of 

 Man (Alder); dead upon the shore at Herm, near Guernsey 

 (Metcalfe). 



