No. 2327. THE ANNULARIIDAE— HENDERSON AND BARTSCH. 73 



The group of Annularia lincina: 



Turbo lincina Linnaeus Jamaica. 



Cydostoma lima C. B. Adams Jamaica, 



Cydostoma lima blandiana C. B. Adams Jamaica. 



Cydostoma pisuvi C. B. Adams Jamaica. 



The group of Annularia illustris: 



Cydostoma minium Gundlach Eastern Cuba. 



Choanopoma bebini (Arango) Pfeiffer Western Cuba. 



Cydostoma tractum Gundlach Western Cuba. 



Choanopoma jiguanensis Pfeiffer Eastern Cuba. 



Cydostoma perplicatum Gundlach Cuba. 



Cydostoma arangiannm Gundlach Eastern Cuba. 



Cydostomn decussatum Lamarck Porto Rico. 



Cydostoma ( Choanopoma) senticosum Shuttleworth Porto Rico. 



Cydostoma sulculosum Ferussac Porto Rico. 



Cydostoma trodilearis Pfeiffer Mexico. 



Choanopoma storchi Pfeiffer Eastern Cuba. 



Cydostoma largillierti Pfeiffer Yucatan. 



Cydostoma mordax C. B. Adams Jamaica. 



Cydostomxi inailta Poey Central Cuba. 



Cydostoma illustris Poey Central Cuba. 



Cydostoma saultae Sowerby Jamaica. 



The group of Annularia lachneri: 



Choanopoma lachneri Pfeiffer Eastern Cuba. 



Choanopoma blandi Weinland Haiti. 



ANNULARITA, new subgenus. 



Shell ovate-conic, marked by both axial ri])lets and spiral threads. 

 Peristome not expanded into a broad thin disk, but much thickenod, 

 slightly flaring to a thin edge. Operculum typically Annularid. 

 Type of the subgenus. — Cydostoma majusculum Morelet, 

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

 It comes from western Cuba. 



ANNULARELLA, new subgenus. 



Shell ranging in form from turbinate to elongate-ovate. The axial 

 sculpture consists of sublamellar axial ribs between which finer 

 threads parallelling these are present. The spiral sculpture varies 

 considerably in strength in different species. Operculum typically 

 Annularid. 



Type of the subgenus. — Cydostoma (Choanopoma) yunquense 

 Pfeiffer. 



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

 into two groups as follows: 



The group of Annularella yunquense: 



Choanopoma yunquense Pfeiffer Eastern Cuba. 



Annularia pseudalatum, Torre Eastern Cuba. 



