37 



ORD. VI. COELOPNOA OPERCULATA Mke. 

 (Phaueropneumona Gray.) 



FAM. II. CYCLOSTOMACEA Mkc. 



16. CYCLOSTOMA Lam. (aunularia Schum.) 



1. Cyclostomc-u Cumingii G. B. Sowerhy. 



C. testa orbiculari, subdepressa , albicante, epidermidc 

 fusca; spira elevatiuscula, cornea; anfractibus quinqne vel 

 sex, rotundatis, spiraliter sulcatis; sutura subdecurrente; 

 apertura fere circulari, obliqua, alba, superne subacuminata, 

 peritremate simplici subincrassato ; umbilico maximo; oper- 

 culo cornco, tenui, spirali, anfractibus plurimis, margine 

 fimbriato. 



Long. lyL- poll., lat. 2 poll. 



Legit H. Cuming in insula Tumaco Americae meri- 

 dionalis. 



Proceedings. 1832. p. 32. 



2. Cylostoma succineum G. B. Sowerbt/. 



C. testa parva, orbiculato-pyramidali, laevi, succinea; 

 anfractibus quinque rotundatis; sutm-a distincta; apertui'a 

 rotundata, margine basali intcrna angulata; peritremate 

 tenui, acuto; umbllico parvo, margine carinato. 



Long. ^ poll., lat. ^V P^^''- 



Legit H. Cuming in Polynesia (Opara). 



Proceedings. 1832. p. 32. 



3. Cyclostoma minutissimum G. B. So- 

 werby. 



C. testa globoso-pyramidali, fulva, apice nigro; an- 

 fractibus tribus rotmidatis; sutura profunda; apertura circu- 

 lari; peritremate acuto; umbilico nullo; operculo corneo. 



Mensura desideratur. Est autem gcneris hucusque mi- 

 nima species. 



Legit H. Cuming in insula Pitcaini. 



Procccdings. 1832. p. 32. 



