266 PROCEEDINGS OF THE XATIOX.VL MUSEUM vol. 85 



CHONDROTHYRA (FOVEOTHYRA) FOVEATA (Gundlach) Pfeiffer 



Shell elongate-conic, Avhite or orange, unicolor or faintly spirally 

 banded. Peristome white or pale yellow. Nuclear whorls almost 

 2, inflated, strongly rounded, smooth except for fine microscopic 

 granules. Postnuclear whorls also inflated, strongly rounded, and 

 marked by closely spaced, very slender, sublamellar, retractively 

 slanting, axial riblets, which are about one-half the width or less 

 than the spaces that separate them and which render the summits of 

 the whorls minutely crenulated. The spiral sculpture consists of 

 threads of about the same strength as the axial lamellae, but not so 

 elevated, which are of almost the same spacing as the axial riblets. 

 The junction of the spiral threads with the axial riblets renders the 

 latter slightly sinuose and minutely nodulose. Suture well con- 

 stricted; periphery and base inflated, strongly rounded, the latter 

 marked like the spire with the spiral threads a trifle stronger on the 

 umbilical wall. Aperture broadly oval, slightly angulated posteri- 

 orly. Peristome double; the outer very broadly flaringly expanded 

 and marked by poorly developed radial flutings and very slender, 

 weak, concentric lamellae. On the parietal wall this outer peristome 

 is inpinched, and over the umbilical region it is deeply pittedly im- 

 pressed, completely closing and plugging the umbilicus. The inner 

 peristome is slightly exserted and adnate to the outer, projecting 

 only a trifle above this. Operculum thin, corneous with submarginal, 

 nucleus, the outside covered Avith a thin deposit of fine calcareous 

 granules, which become thinner toward the margin, vanishing before 

 reaching this. 



This species comes from Santa Cruz de las Pinas and El Toro, 

 Sierra de Limones. 



KEY TO THE SUBSPECIES OF CHONDROTHYRA (FOVEOTHYRA) FOVEATA 



Shell slender foveata 



Shell stout toroensis 



CHONOROTHYRA (FOVEOTHYRA) FOVEATA FOVEATA (Gundlach) Pfeiffer 

 PlATE 17, FiGURB 9 



1863. Chondropoma fovcatnm (Gundlach) Pficiffer, Malakozool. Blatter, vol. 



10, pp. 185-186. 

 1920. Ch7-ondrothyra (Ohondrotlxyretcfi) foveatum Hendebson and Bartsch, 



Proc. U. S. Nat. Mus., vol. 58, p. 64. 



This subspecies is pale wax yellow with white peristome, marked 

 by obscure interrupted spiral lines of brown. The peristome is much 

 slenderer than in tlie next species and has the whorls less inflated and 

 the sculpture considerably reduced on the last whorl and not nearly 

 so prominent on all the whorls. 



