3G 



Subgenus Calypeopsis, Less. 

 Cyatlio intemo integro, lateialiter adlia?rente. 



Calyptr;ea kadiata. Cal. tcstd conico-orbiculari, alblhi fusco ra- 

 diatd, strlis longiluditialiliis crehris ; limbo crenulato ; apiceacuto, 

 suhreciirvo ; cynllio depresso : diam. I , nlt. ^V poli. 



Ilab. in America Meridionali. (Bay of Caraccas.) 



The cup of tliis pretty species is pressed in, as it were, on one side, 

 and adheres to the shell not oniy by its apex, but also by a lateral 

 seani, which scarcely reaches to tbe rim of the cup. The apex of the 

 younger specimens, both externaliy and internally, is generally of a 

 rich brovvn, and there can be little doubt that when first produced 

 they are entirely of that colour. 



Found in sandy mud, on dead shells, at a depth of from seven to 

 eight fathoms. — W. J. B. 



CALYPTiiiEA iMBKiCATA. Cal. testd olhidd, crassd, subconicd, ovatd, 

 costis longiludinnlibuset sqiiamis tronsversis imbricatd ; apice snh- 

 incurvo, acuto ; limbo crena to ; cyalho depresso : diam. 1, Uit. į, 

 alt. ; poli. 



Hab. ad Panamam. 



Found on stones, in sandv mud, at a depth of from six to ten fa- 

 thoms W. J. B. 



Calyptr.ea LiGNAnrA. Cal. testd crassd,fuscd, deformi, striis cor- 

 rugutd; apice proniinentesubadunco, acuto, posteriore : long. lx\, 

 lat. ^, alt. į poli. 



Hab. in America Centrali. (Real Liejos.) 



The mnjority of individuals of this s))ecies have their shells so de- 

 fornied that thcy set description at defiance : the comparatively well- 

 formed shell occurs so rarely that it may be almost considered as the 

 e.vception to the rule. When in this last-mentioned statė, the circum- 

 ference of the shell is an irregular, somevvhat rounded oval, and it 

 rises into a shape somevvh;it resembling the back of Ancylus,\v'\i\\ the 

 <T/jex very sharp and indining downward.s. The shell in this shape is 

 generally less corrugated than it is in deformed individuals, though 

 some of those are comparatively smooth ; but in both statės the shell 

 is striated immediately under the apex, and is for the most part cor- 

 rugated on the other side of it. 



Found under stones. 



Var. n. Enormiter conica, cyatho valdfe profundo. 



This variety is often one inch and six eighths in heiglit, and its cup 

 nearly one inch deep, while the diameter of the shell at the aperture 

 does not exceed one inch. 



Found on shells at the Island of Chiloe, in sandy mud, at the depth 

 of four fathoms. — W. J. B. 



CALYPTRiEA TENUis. Cūl. testd irregulūri, tenui, subdiaphand, ere- 

 herrime slrintiU albidd interdum fusco pallide strigatd : diam. 1 

 circ, alt. -^ poli. 

 Hab. ad Peruvise oras. (Samanco Bay.) 



Found on living shells, in muddy sand, at a de])th of nine fathoms. 

 — \V. J. B. 



