APPENDIX. 623 



now subjoin, it appears to differ sufficiently to entitle it to be 

 kept distinct. 



Operculum non-spiral. 



Shell obovate, smooth; spire short, very obtuse, apex not ele- 

 vated, whorls rapidly increasing ; aperture transverse, semi-lunar, 

 angulated above, rounded below, width almost equalling the 

 height, margins disunited, the columellar margin straight. 



Ex. E. mirabilis, J. Midler. 



Found parasitic on Synapta digitata, one of the HolothuriidcB, 

 at Trieste. 



Vol. i. p 204. Genus CYPR^A. 



Sub-gen, naria, Gray. 



Shell with the front of the columella narrow, dilated into a 

 sharp-toothed ridge, with a distinct fold in front, separated from 

 the teeth by a deep groove. C. irrorata is an example. 



Genus PELICAPJA, Gray. 



(Fam. APORRHAID^.) 



Shell spiral; spire of adult covered with an enamel coat; 

 aperture ovate ; outer lip sinuous, sharp-edged. 



Ex. P. scutulata, Martini (vermis, Gray), pi. 137, fig. 7. 

 Operculum, P. scutulata, fig. 7, a. 



Genus CLE A, H. and A. Adams. 



(Sub-fam. melanopsin.e.) 



Shell bucciniform, ovate, covered with a brown-black, horny 

 epidermis ; spire as long as the aperture, apex decollated, whorls 

 rather convex, transversely striated ; aperture oblong-ovate, with 

 a distinct notch in front ; columella abruptly truncate, with a 

 single oblique, spiral fold anteriorly ; outer lip simple, the mar- 

 gin somewhat reflexed, and thickened internally. 



Ex. C. nigricans, A. Adams, pi. 137, fig. 8. 



