66 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.58. 



Type of the subgenus. — Cyclostoma umhricola Weinland. 

 Of this subgenus the type species only is known. It comes from 

 Haiti. 



PARACHONDRELLA, new subgenus. 



Shell elongate-conic, marked by axial ribs, spiral sculpture con- 

 fined to the umbilicus. Operculum typically Parachondroid. 

 Type of the subgenus. — Cyclostoma fecunda C. B. Adams. 

 The following species are now referred to this subgenus : 



Turbo columna Wood Jamaica. 



Cyclostoma adamsi Pfeiffer Jamaica. 



Cyclostoma avena C. B. Adams Jamaica. 



Cyclostoma fecunda C. B . Adams Jamaica. 



Cyclostoma fecunda distincta C. B . Adams " Jamaica. 



Cyclostoma armata 0. B . Adams Jamaica. 



Cyclostoma maritima C. B . Adams Jamaica. 



Cyclostoma maritima aurora C. B . Adams Jamaica. 



Subgenus PARACHONDRIA Dall. 

 1,905. Parachondria Dall, Proc. Malac. Sec. London, vol. 6, p. 209. 



Shell elongate-conic, marked by strong axial and spiral threads. 

 Operculum typically Parachondroid. 



Type of the subgenus. — Turbo fascia Wood. 



The following species are now referred to this subgenus. They fall 

 into two groups as follows: 



The group of Parachondria fascia: 



Turbo fascia Wood Jamaica. 



Cyclostoma fascia proxima C. B. Adams Jamaica. 



Cyclostoma harklyana Chitty Jamaica. 



Cyclostoma simulans C . B . Adams Jamaica. 



Cjjclostoma angu^tae C. B. Adams Jamaica. 



The group of Parachondria dentilobata: 



Cyclostoma quartemata Lamarck Haiti . 



Cyclostoma hydii Weinland Inagua. 



Cyclostoma pupaeformis Sowerby Haiti. 



Cyclostoma aminensis Pfeiffer Santo Domingo. 



Cyclostoma emilianum Weinland Haiti, 



Cistula capillacea Pfeiffer Santo Domingo. 



Cyclostoma cinclidodes Pfeiffer Santo Domingo . 



Cyclostoma dentilobata Weinland Haiti. 



Cyclostoma tappaniana C. B. Adams Jamaica. 



Parachondria (Parachondria) gonavicola, new species Haiti. 



PARACHONDROPS, new subgenus. 



Shell ranging in shape from elongate-ovate to elongate-conic. 

 The axial sculpture consists of slender sublamellar riblets, which are 

 rendered wavy or articulate by the ill-defined spiral sculpture. 

 Operculum typically Parachondroid. 



