HISPANIOLAN AND BAHAMAN ANNULARIIDAE 71 



C. Pease at his station 85 on Sr. Del Monte's plantation in a verdant 

 gully near Salvation at about 3,000 feet elevation. 



U.S.N.M. No. 472032 contains 10 specimens collected by Dr. W. L. 

 Abbott 2 miles north of Maniel Viejo in the Sierra de Bahoruco Prov- 

 ince, Dominican Republic, at an elevation of 3,500 feet, which appear 

 to be identical with these. I have figured one of the latter (U.S.N.M. 

 No. 472031), which has 6.6 whorls remaining, having probably lost the 

 first nuclear turn, and measures: Length, 12.3 mm.; greater diameter, 

 7.2 mm.; lesser diameter, 5.7 mm. 



This subspecies is easily distinguished from Chondropoma (Chondro- 

 poma) vanattae verettense by the fact that the last whorl is solute for 

 about one-fifteenth of a turn. 



CHONDROPOMA (CHONDROPOMA) VANATTAE VERETTENSE, new subspecies 



Plate 12, Figure 5 



This race was collected by Dr. W. L. Abbott at Fonds Verettes south- 

 west of the western end of Lake Enriquillo, Haiti. 



The type, U.S.N.M. No. 472033, has 5.5 whorls remaining, having 

 probably lost the first nuclear turn, and measures: Length, i3 mm.; 

 greater diameter, 7.3 mm. ; lesser diameter, 5.9 mm. 



This race is easily distinguished from C. (C.) v. vanattae by the fact 

 that the last whorl is adnate to the preceding turn on the parietal wall. 



U.S.N.M. No. 472034 contains 31 topotypes. 



U.S.N.M. No. 402543 contains i specimen collected by C. R. Orcutt 

 south of Fonds Verettes on the trail to Bodarie on the north slope. 



Subfamily Rhytidopominae Henderson and Bartsch 



1920. Rhytidopominae Henderson and Bartsch, Proc. U. S. Nat. Mus., vol. 58, 

 pp. 64-65. 

 Shell ranging from elongate-conic through ovate to turbinate. Axial 

 ribs are always present ; they may vary from mere threads to lamellae ; 

 they may terminate simply; they may become expanded at the summit 

 into broad denticles or even fused there into hollow cusps or tufts. Spiral 

 threads may be present on spire, base, and umbilicus or in the umbilicus 

 only, or they may be even entirely absent. The last whorl may be adnate 

 or solute and the umbilicus may be open or closed. The operculum has 

 as a basis a chondroid plate composed of several whorls, the outer sur- 

 face of which bears numerous retractively slanting, raised lamellae, 

 which vary greatly in strength in the different genera. They may ex- 

 tend completely across each whorl or they may cover only a part of 

 it, as in Opisthosiphon. These lamellae may or may not be fused on 

 their inner and outer termination, and the free edge may be fused to 

 form a pseudolamella. They may be rather distantly spaced or they may 

 be almost fused at their edge. Special devices for breathing when the 



