HISPANIOLAN AND BAHAMAN ANNULARIIDAE 201 



differentiated. This race has the whorls a little more rotund than the 

 typical Cuban forms; it is also one of the obsoletely axially sculptured 

 forms. 



Subgenus Chondropomisca Torre and Bartsch 

 1938. Chondropomisca Torre and Bartsch, Proc. U. S. Nat. Mus., vol. 85, p. 375. 



Small shells, varying from ovate to broadly ovate in outline, with 

 the spiral threads a little stronger than the axial riblets, the junctions 

 of the two forming sharply pointed cusps. The summit of the whorls 

 is rendered finely denticulated by the axial riblets. Peristome double, the 

 outer only moderately expanded. 



Type species.- Cyclostoma (Chondropoma) rufopictum 'Gundlach' 

 Pfeiffer= Chondropoma (Chondropomisca) rufopictum ('Gundlach' 

 Pfeiffer). 



This subgenus was created by Torre and Bartsch for a group of 

 east Cuban land shells characterized as above. The extension of the 

 group into the Bahamas is interesting. Little Inagua and Providenciales 

 of the Caicos Atoll lie in a northeasterly direction from eastern Cuba. 

 No members of this subgenus have been reported from Haiti or the 

 Dominican Republic. 



KEY TO THE BAHAMAN SPECIES OF CHONDROPOMISCA 



Axial ribs heavy and distantly spaced providencialense 



Axial ribs not heavy or distantly spaced saccharinetense 



OHONDBOPOMA (CHONDKOPOMISCA) PROVIDENCIALENSE, new species 



Plate 32, Figure 2 

 Shell pupoid in outline, white; nuclear whorls decollated, the re- 

 maining postnuclear whorls well rounded, and marked by almost 

 vertical, very strong, rather broad axial ribs, which are rendered den- 

 ticulate by the spiral threads. Of these ribs i8 occur upon the first and 

 22 upon the remaining turns. The spiral sculpture consists of rather 

 feebly developed, broad, rounded, low threads, which are best visual- 

 ized on the ribs by the denticulation they produce there. Of these, six 

 occur between the summit and the suture. Suture strongly constricted, 

 rendered decidedly sinuous by the axial ribs. Periphery inflated. Base 

 short, well rounded, and marked by the continuation of the axial ribs, 

 which extend into the moderately broadly open umbilicus, and by seven 

 spiral cords of about the same strength as those on the spire. Within 

 the umbilicus the spiral sculpture becomes enfeebled. The last whorl is 

 solute for about one-sixth of a turn. Aperture broadly ovate ; peristome 

 simple within at the edge. 



The type (U.S.N.M. No. 390179) I collected on the southeast point 

 of Providenciales, Caicos Group, Bahamas. It has almost 4 whorls re- 

 maining and measures: Length, 9.8 mm.; greater diameter, 5.7 mm.; 

 lesser diameter, 5.2 mm. 



U.S.N.M. No. 536739 contains a topotype from the same source. 



