CUBAN ANNUUARIIDAE — TORRE AND BARTSCH 159 



RHYTIDOPOMA PINENSE COLOMBENSE. new subspecies 



Plate 11, Figure 10 



This race comes from the Sierra de Colombo. It is distinguished 

 readily from the other subspecies in that the spiral cords in the 

 umbilicus are few and much stronger than in the other races. 



The type, U.S.N.Al. No. 355579, has 88 axial ribs on the first of the 

 remaining turns, 118 on the second, and 130 on the last; it has a little 

 more than 4 whorls remaining and measures: Length, 10.3 mm.; 

 greater diameter, 5.5 mm.; lesser diameter, 4.6 mm. 



KHYTIDOPOMA PINENSE ERGASTULUM, new subspeciea 



Plate 11, Figure 16 



This race comes from the Presidio side of the Sierra de Caballos. 

 The closely spaced axial ribs, combined with the weak spiral cords in 

 the umbilicus, will differentiate this race from the others. 



The type, U.S.N.M. No. 355581, has 82 axial riblets on the first 

 of the remaining turns, 92 on the second, and 114 on the last whorl. 

 It has 3.7 whorls remaining and measures: Length, 9.7 mm.; greater 

 diameter, 5.0 mm.; lesser diameter, 4.3 mm. 



RHYTIDOPOMA PINENSE PINENSE, new subspecies 



Plate 11, Figure 17 



This subspecies comes from the Sierra de Casas, where we collected 

 it from one end of the range to the other. It is distinguished from R. 

 pinense colombense in having many more spiral threads in the umbilicus 

 and from R. pinense ergastulum in having the axial ribs stronger and 

 more distantly spaced. 



The type, U.S.N.M. No. 355576, was collected by Bartsch at the 

 south end of the west side of the Sierra de Casas. There are 52 axial 

 ribs on the first of the remaining turns and 84 on the last whorl ; it has 

 4 whorls remaining and measures: Length, 11.3 mm. ; greater diameter, 

 5.7 mm.; lesser diameter, 5.0 mm. 



RHYTIDOPOMA CLATHRATUM (Gould) 



Shell elongate-conic, flesh colored. Nuclear whorls a little more 

 than 2, inflated, well rounded, microscopically granulose, forming a 

 mammillated apex, the last turn showing the beginning of the post- 

 nuclear sculpture. Postnuclear whorls somewhat inflated, well 

 rounded, marked by sublamellar or cordlike axial ribs. These ribs 

 are much more strongly developed at the summit, where they are 

 rather irregular and slightly retractively slanting. In two of the 

 subspecies, when the whorls are decollated they prove to be hollow 

 and blisterlilsie. The spiral sculpture consists of obsolete threads, 

 which render the axial ribs slightly wavy. Suture very strongly con- 



