222 CiEcuM. 



Undetermined Species. 

 C. LiRATOCiNCTUM and C. HEPTAGONUM, Carp. Mazatlan. 



Of the latter species Folin has described vars. hexagonum and 

 octogonum. 



C. iMBRiCATUM, Carp. West Indies. 



C. INFIMUM (Aspinwall), C. mirificum, C. uncinatum, Folin. 



Section V. Ar'mata. 

 C. SPINOSUM, Folin. (Description and figure inaccessible to me). 



Undetermined Species of Csecum. 



I am unable to refer the following species to their appropriate 

 sections : — 



C. triornatum, C. abbreviatum, C. instructum, C. contractum, 

 C. VESTiTUM, of de Folin. 



C. FASCiATUM, and var. intaminata, de Folin. Mediterranean. 



C. Syriacum, de Folin. Tripoli.^ in Syria. 



C. viTREUM,and var. subornata, C. inclinatum, C. marginatum, 

 de Folin. Gape Verde Is. 



C. viciNUM, C. CRASSUM, C. Senegambianum, Folin. W. Africa. 



C. formulosum, and vars. decussatum, marmoratum and sul- 

 catum, de Folin. Bahamas. 



C. sepimentum, de Folin. Sandivich Is. 



C. sepimentum, var. arcuatum, de Folin, Tahiti. 



C. INFLATUM, C. variegatum, and var. minima, de Folin. 



Hong Kong. 



C. Chinense, de Folin. China, Australia. 



Subgenus Meioceras, Carpenter, 1858. 



C. nitidum, Stimpson. PL 67, fig. 13. 



Shell smooth, shining, whitish or light brown, inflated in the 

 middle, contracted towards the aperture, aperture oblique, sep- 

 tum submucronate, the mucro convexly rounded ; operculum 

 concave, 5-whorled. Length, '088 mill. 



Florida, West Indies. 



Carpenter describes a species under the name of nitidum, 

 Bean MS., which appears to be identical. 



