62 PROCEEDINGS OF TEE NATIONAL MUSEUM. vol. 68. 



The following species fall into this subgenus, in five groups: 

 The group of Chondropoma raveni: 



Cistula raveni Crosse Curacoa. 



Cylostoma serraticosta Weinland Haiti. 



Colobostylus rollei Weinland Haiti. 



The group of Chondropoma semilahre: 



Cyclostoma semilabre Lamarck Haiti. 



Chondropoma navassense Tryon Navassa. 



Cyclostoma {Chondropoma) blandiim Pfeiffer Santo Domingo. 



Cyclostoma (Chondropoma) blauneri Shuttleworth Porto Rico. 



Cyclostoma {Chondropoma) sivifii Shuttleworth Porto Rico. 



Chondropoma brownianuvi Weinland .Haiti. 



Chondropoma hjalmersoni Pfeiffer Bahamas. 



Cyclostoma moestum (Shuttleworth) Pfeiffer Matanzas. 



Chondropoma garceanum Tone Matanzas. 



Cyclostoma revocatum Gundlach Eastern Cuba. 



Chondropoma vnlcoxi Pilsbry and Henderson Central Cuba. 



Chondropoma ernesti Pfeiffer Eastern Cuba. 



The group of Chondroporna irradians: 



Cyclostoma irradians (Shuttleworth) Pfeiffer Matanzas. 



Cyclostoma grunneri Pfeiffer Honduras. 



The group of Cliondropoma jnctum: 



Cyclostoma pictum Pfeiffer Matanzas. 



Chondropoma yucayum (Presas) Pfeiffer Matanzas. 



Cyclostoma dissolutum Poey Isle of Pines. 



Cyclostoma pfeifferianum Poey Havana. 



Cyclostoma poeyanum Orbigny Havana. 



Chondropoma tenuilirata Pfeiffer Havana. 



Cyclostoma perlatum Gundlach Matanzas. 



Cyclostoma laetum (Gutierrez) Poey Eastern Cuba. 



The group of Chondropoma ohesum: 



Truncatclla obesum Menke Matanzas. 



Chondropoma carenasense Pilsbry and Henderson Central Cuba. 



Chondropoma carenasense guantananiensis Torre Eastern Cuba. 



Chondropoma oxytremum (Gundlach) Pfeiffer Eastern Cuba. 



Chondropoma solidulum (Gundlach) Pfeiffer Eastern Cuba. 



Chondropoma solidulum tanamcnsis Torre Eastern Cuba. 



Cyclostoma {Chondropoma) simplex Pfeiffer Santo Domingo. 



Chondropoma caribbeum Clapp Swan Island. 



Chondropoma marginalbum (Gundlach) Pfeiffer Eastern Cuba. 



Cyclostoma {Chondropoma) hisslingianum Weinland Haiti. 



Ctenopoma bryanti Pfeiffer Bahamas. 



Cyclostoma rufilabre (Beck) Potiez and Michaud Lesser Antilles. 



Chondropoma julieni Pfeiffer Sombrero Island. 



Chondropoma ignea Reeve Lesser Antilles. 



CHONDROTHYRA, new genus. 



Shell ranging in form from turbinate to elongate-conic. The 

 sculpture in varying intensity may consist of axial ribs only, or of 



