No. 2327. THE ANNVLARIIDAE— HENDERSON AND BARTSCH. 67 



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

 The following species are now referred to this subgenus: 



Cyclostoma campbelli C. B. Adams Jamaica. 



Cyclostoma sheppardiana C. B. Adams Jamaica. 



Rhytidopomafraterminor Pilsbrj- and Brown Jamaica. 



Ctenopoma nigriculum (Gundlach) Pfeiffer Eastern Cuba. 



Ctenopoma jeannereti Pfeiffer Eastern Cuba. 



Cyclostoma wilkinsoni C. B. Adams Jamaica. 



Tudora lurida (Gundlach) Pfeiffer Eastern Cuba. 



Genus OPISTHOSIPHON Ball. 



1905. Opisthosiphon Dall, Proc. Malac. Soc. London, vol. 6, p. 209. 



Shell ranging in shape from turbinate to elongate-conic, marked 

 by axial ribs and spiral tlireads. In the subgenus Opisthosiphona 

 the latter are confined to the umbilicus, while in Opisthosiphon 

 they are found both on the spire and base. All members of this 

 genus have a breathing siphon situated on the angle formed by the 

 junction of the parietal and outer walls a little behind the peristome. 

 In some forms this siphon is a mere upright tube; in others, it is 

 flexed and bent to pass through the chink formed behind the peristome 

 when the last whorl is solute, the breathing pore thus communicat- 

 ing with the hollow axis. In some forms where the w^horl is not 

 solute, the siphon is reflected backward. Operculum typically 

 Parachondroid. 



Type of the genus. — Cyclostoma hahamense Shuttleworth. 



OPISTHOSIPHONA, new subgenus. 



Shell ranging from turbinate to elongate-conic. Spire and base 

 marked by axial riblets; spiral threads confined to the umbilicus. 

 Breathing siphon present. Operculum typically Parachondroid. 



Type of the subgenus. — Cyclostoma moreletiana Petit. 



The following species are now referred to this subgenus. They 

 fall into two groups, as follows : 



The group of Opisthosiphona moreletianum,: 



Cyclostoma moreletianuvi Petit Isle of Pines. 



Cyclostoma pupoides Morelet Isle of Pines. 



Tudora excurrens (Gundlach) Pfeiffer Eastern Cuba. 



Opisthosiphon berryi Clapp Eastern Cuba. 



Opisthosiphon {Opisthosiphona) berryi semiapertus Torre and Henderson 



Eastern Cuba. 

 Opisthosiphon (Opisthosiphona) paredonensis Torre and Henderson . .Eastern Cuba. 



Opisthosiphon (Opisthosiphona) obturatus Torre and Henderson Eastern Cuba. 



Opisthosiphon (Opisthosiphona) subobturatus Torre and Henderson . .Eastern Cuba. 



Opisthosiphon (Opisthosiphona) apertus Torre and Henderson Eastern Cuba. 



Opisthosiphon (Opisthosiphona) bioscai Torre and Henderson Eastern Cuba. 



Opisthosiphon (Opisthosiphona) salustii Torre and Henderson Eastern Cuba. 



Opisthosiphon (Opisthosiphona) occultus Torre and Henderson Eastern Cuba. 



Opisthosiphon (Opisthosiphona) trincheracensis Torre and Henderson .Eastern Cuba. 



