74 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.58. 



The group of Annularella bertini: 



Choanopoma hertini Maltzan 1 iaiti. 



Choanopoma bertini gracillima Maltzan Haiti. 



ANNULAROPS, new subgenus. 



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

 Axial riblets sublamellar, rendered articulate by the spiral scuplture. 

 Parietal wall perforated by a breathing pore near the posterior angle. 

 Operculum typically Aimularid. 



Type of the subgenus. — Choanapoma blaini (Gundlach) PfeiflFor. 



The following are now referred to this subgenus : 



Choanopoma sauvaUei (Gur dlach ) Pfeiffer Western Cuba. 



Cyclostoma sordidum (Gundlach) Poey Western Cuba. 



Choanopoma tryoni Ai'ango Western Cuba. 



Choanopoma blaini (Gundlach) Pfeiffer Western Cuba. 



ANNULARODES, new subgenus. 



Shell elongate-ovate, marked by regular nonarticulate axial ribs 

 and fine spiral threads; breatliing pore provided with an external 

 siphon. Operculum typically Annularid. 



Type of the subgenus. — Choanopoma uncinatum Arango. 



The type species is the only one known of this group at present. 

 It comes from Central Cuba. 



Genus BLAESOSPIRA Crosse. 



1890. Blaesospira Crosse, Journ. Conchyl., vol. 38, p. 280. 

 Shell ranging in form from ovate-conic to elongate-conic. All the 

 whorls or only the last portion of the last whorl may be solute. The 

 axial sculpture consists of distantly spaced ribs, between which finer 

 axial threads are present. The spiral sculptm-e consists of a series of 

 spiral cords that form strong hollow tubercles at their junction with 

 the axial ribs. Operculum with the calcified spiral lamella rising 

 vertically from the whorls. 



Ti/pe of the genus. — Cyclostoma (Choanopoma) echinus (Wright) 

 Pfeiffer. " 



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

 mto two groups as follows: 



The group of Blaesospira echinus: 



Cyclostoma (Choanopoma) echinus (Wright) Pfeiffer Western Cuba. 



The group of Blaesospira preirei: 



Cyclostoma pretrei Orbigny Western Cuba. 



ABBOTTELLA, new genus. 



Shell depressed, helicoid, marked by axial ribs between which finer 

 w&xj axial threads are present. The spu*al sculpture consists of 



