304 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



The type, U.S.N.M. no. 499582, comes from the west end of El 

 Queque. It is a complete specimen, has 7.5 whorls, and measures: 

 Length, 30.7 mm; greater diameter, 18.8 mm; lesser diameter, 13.2 

 mm. 



The species ranges through the Vinales region. It is also found 

 in Dos Hermanos and Puertecitas. 



CHONDROTHYRETES PARILIS. new species 



Shell elongate-ovate, varying in color from pure milk white 

 through straw-color, horn-color, orange, and dark brown. It may 

 be unicolor, variegated or marbled, usually the latter. The outer, 

 broadly expanded peristome also varies in color from pale yellow 

 to deeper yellow and is rayed in all specimens but the alabastrian 

 form of C. parilis simonis. Nuclear whorls about 2, well rounded, 

 smooth. The postnuclear whorls are moderately rounded and marked 

 by slender retractively curved riblets and spiral threads, the latter 

 considerably stronger than the axial riblets. The junctions of the 

 two form nodules on the early whorls, which become weakened on 

 the later turns. Suture moderately constricted; periphery well 

 rounded. Base short, well rounded. Aperture oval. Peristome 

 double, the outer broadly flaringly expanded and marked by numer- 

 ous slender concentric lamellae adnate to the preceding turns at the 

 posterior angle and deeply cut in the middle of the inner lip. The 

 part posterior to it reflected over and covering the umbilicus. 

 Parietal wall covered by a broad callus. Operculum typically 

 chondropomoid. 



This species ranges through the small mogotes west and south of 

 the Sierra San Andres as well as the Sierra San Andres. 



KEY TO THE SUBSPECIES OF CHONDROTHYRETES PARILIS 



Spiral threads conspicuously white. 



Shell dark brown or red scalaris 



Shell not dark brown or red. 

 Shell horn-color. 



Outer lip conspicuously rayed parilis 



Outer lip not conspicuously rayed simonis 



Spiral threads not conspicuously white. 



Shell dark brown or reddish fossularis 



Shell horn-color amoena 



CHONDROTHYRETES PARILIS SCALARIS, new subspecies 



Plate 23, Figure 1 



This race comes from the Escaleras de San Andres. It is an ex- 

 ceedingly dark race, with rayless orange-colored outer peristome and 

 with the spiral threads white, which gives it a very striking color 

 pattern that readily distinguishes it from all the other races. 



