170 PLEUROTOMA. 



C. B. Adams changed the name of this species to fieevei 

 because he had previously described a shell under the name of 

 violacea, but as the latter is a Bela, Hinds' name ma}' stand. 

 P. vertebrata, E. A. Smith (figs. 29, 29 a), is probably synony- 

 mous. 



P. DECLIVIS, Martens. PL 4, fig. 41. 



Shell multicarinate, the carinae stronger and fewer than in the 

 preceding species ; canal somewhat more produced and narrowed ; 

 sinus shallow ; columella not plicate ; color light reddish fulvous. 



L. 33, diam. 11 mill. 



Japan. 

 P. FILOSA, Marrat. 



Shell acuminately turreted ; whorls convex, with numerous 

 prominent revolving carinae, the interstices narrow, obliquely 

 longitudinally striated; white, the apex tinged with fuscous; 

 canal very short ; sinus ample. (No dimensions.) 



W. Africa. 



A white shell, corded with transverse, thread-like bands. The 

 Pl.violacea, Hinds, Pl.crispata, Crist, et Jan., and several others 

 are similarly corded and closely allied shells. 



The above is an unfigured species, which I have not seen. 



P. RETUSISPIBATA, E. A. Smith. 



An unfigured species, L. 7'75, diam. 2'5 mill. Habitat unknown ; 

 it is said to have for its nearest relative "P. violacea, Hinds, 

 from which it differs in form somewhat ; the apex is blunter, and 

 there is but a single nodose liration around the middle of each 

 whorl, whereas Hinds' species possesses two." Columella with 

 two minute plications. 



P. COGNATA, E. A. Smith. 



Unfigured. L. 24, diam. 7 mill. Australia. Differs from P. 

 violacea, to which it is closely related in color (being luteous 

 white, purple-tinged towards the apex, the carinae white), in the 

 number of carinae, twelve, and more produced spire. " It is still 

 more nearly allied to P. vallata, Gould, from which it differs only 

 in size and the presence of only one plication on the columella, 

 whereas P. vallata possesses two. It may be merely the adult 

 of the latter species." 



