CUBAN SUBFAMILY CHONDROPOMINAE TORRE AND BARTSCH 267 



It comes from Rio Santa Cruz de los Pinas. 



The specimen figured, U.S.N.M. no. 492728, lacks the nuclear 

 whorls. It has 5.3 whorls remaining and measures : Length, 24.3 

 mm; greater diameter, 15.9 mm; lesser diameter, 9.6 mm. 



CHONDROTHYRA (FOVEOTHYRA) FOVEATA TOROENSIS, new subspecies 

 Plate 17, Figure 11 



In this race, which comes from El Toro of the Sierra de Limones, 

 the shell is pale chestnut-brown, with the peristome pale yellow. 

 Faint interrupted spiral lines of brown are present also. The whorls 

 in this race are much more inflated than in the typical race, and the 

 sculpture is in every way much stronger and more pronounced. 



The type, U.S.N.M. no. 492729, has 4.8 whorls remaining and meas- 

 ures : Length, 23.5 mm ; greater diameter, 15.8 mm ; lesser diametex', 

 10.5 mm. 



CHONDROTHYRA (FOVEOTHYRA) NATENSONI, new species 



Plate 17, Figure 8 



Shell small, elongate-ovate, pale yellow, with faint interrupted 

 spiral bands. Nuclear whorls 2, well rounded, smooth, marked with 

 microscopic granulations. Postnuclear whorls inflated, strongly 

 rounded, marked by retractively slanting, sublamellar axial riblets, 

 which are somewhat thickened at the summit and render this slightly 

 crenulated. These threads are rather closely spaced, being about 

 half as wide as the spaces that separate them on the last turn. In 

 addition to this, the whorls are marked by slender spiral threads, 

 which are less than half the width of the spaces that separate them. 

 These render the axial riblets slightly sinuose and feebly nodulose. 

 This sculpture also obtains on the inflated and well-rounded base. 

 Operculum oval; peristome double, the outer flaringly expanded, 

 deeply pitted at the umbilical region and forming a channel on the 

 parietal wall between the inner lip and the parietal wall. The inner 

 peristome is exserted and slightly reflected. Operculum paucispiral, 

 thin, covered with a thick granular calcareous deposit. 



The type, U.S.N.M. no. 468738, was collected by Natenson at the 

 Entronque de Herradura. It has 4 whorls remaining and measures : 

 Length, 14.2 mm; greater diameter, 9.3 mm; lesser diameter, 6.8 mm. 



The small size will easily distinguish this from the other species. 



CHONDROTHYRA (FOVEOTHYRA) CUMBRENSIS, new species 



Shell ovate, wax yellow with interrupted spiral bands of brown. 

 The nuclear Avhorls are decollated in all our specimens. Postnuclear 

 whorls inflated, strongly rounded, marked with sublamellar, retrac- 



