132 Descriptions of New Species of Shells. 



virente ; spira parum elevata, apice obtusiuscula ; anfr. 4, celeriter accre- 

 scentibus, convexis ; sutura profunda ; umbilico mediocri, profundo ; 

 apertura subobliqua, circulari, perist. simplice, continue, recto, marginibus 

 approxirnatis: operculo corneo, tenui, arctispiro, extus concaviusculo ; 

 anfr. 8. 



Shell umbilicate, orbiculate, and somewhat conical, rather 

 thin, with oblique hardly perceptible stride of growth ; color 

 of a light greenish-yellow, verging towards olive ; spire not 

 much elevated, with the apex rather obtuse ; whorls 4, rapidly 

 increasing, convex, suture deep, umbilicus moderate, deep ; 

 aperture somewhat oblique, circular, its outline hardly broken 

 by the penult whorl ; peristome simple, continuous, straight, 

 its margins approximate : operculum horny, thin, a little con- 

 cave without, closely spiral, with 8J- whorls united by inconspi- 

 cuous sutures. 



Greater diam. 0.45 inch (11 millim.). Lesser diam. 0.40 inch 

 (10 millim.). Height 0.24 inch (6 millim.). 



Length of aperture 0.21 inch (5 millim.). 



Habitat. Guadaloupe. 



Obs. In size and form this species approaches C. asperulum 

 Sow., but differs entirely in its surface. In color and general 

 habit it is related to 0. translucidum Sow., but is more depressed. 

 Its opercnlum is also quite different from that of either of the 

 above s} '-ics, and would bring it within the proposed artificial 

 subgenus Cyclophorus. Its natural affinities, however, would 

 bring it much nearer to species which have been placed in the 

 equally artificial subgenus Cyclotus. Mr. Bland has kindly 

 afforded me the opportunity of describing this shell, which was 

 communicated to him by Henry Krebs, Esq., of St. Thomas, 

 W. I., who gives M. Duchaissaing as authority for the above 

 habitat. 



