CUBAN SUBFAMILY CHOXDROPOMINAE TORRE AXD BARTSCH 231 



CHONDROPOMETES (CHONDROTHYROMA) SCOPULORUM, new species 



Shell small, unicolor, white or yellowish white Operculum white 

 or pale reddish. Nuclear whorls about 2, very finely granulose, 

 strongl}" inflated and rounded, continuing the outline of the rest of 

 the spire. Postnuclear whorls inflated, strongly rounded, separated 

 by a well-impressed suture, and marked by retractively curved lamel- 

 lar axial riblets, which are a little more definitely spaced on the 

 early whorls than'the later. Umbilicus varying in width in the dif- 

 ferent races, but always broadly open. Umbilical wall with or with- 

 out spiral threads. Peristome double; the outer broadly expanded 

 and reflected, the inner only slightly expanded and reflected. Oper- 

 culum multispiral with a rather thick callus on the inner four-fifths, 

 which is somewhat fluted, the thickening having a retractive slant. 



The animal of C. {G.) scopulorum perplexum was described by 

 Bartsch in the field from specimens collected at Cueva del Indio, 

 Mogote Colorado, near San Diego Banos, Pinar del Kio Province, 

 June 17, 1928, as follows: Animal pale smoky gray; tentacles almost 

 sooty Avith a subterminal paler band. Snout a little paler than the 

 general coloration of the body ; edge of body at foot flesh-color. Sole 

 of foot flesh-color with a faint smoky flush. The internal anatomy 

 shines through the body wall behind the tentacles with a rosy flush. 

 The short foot is longitudinally medially, deeply cleft, in progres- 

 sion ; the motion of the two sides is alternate. 



This species ranges from the Sierra de Guira, eastward to the 

 Sierra la Cumbre. The Rio San Diego divides the mountains to the 

 east from the mountains to the west. Those to the west of San Diego 

 los Banos harbor C. {C.) scopulorum scopulorum^ while the mogotes 

 to the east of the Rio San Diego harbor C. (0.) scopulorum per- 

 plexum. The Sierra la Cumbre itself harbors C. (0.) scopulorum 

 cumb reuse. 



Distribution of the subspecies of C. (C.) scojmlorwm is sliown in 

 figure 80. 



KEY TO THE SUBSPECIES OF CHONDROPOMETES (CHONDROTHYROMA) 



SCOPULORUM 



Spiral threads in umbilicus fairly strong cumbrense 



Spiral threads in umbilicus obsolete. 



Axial ribs closely spaced scopulorum 



Axial ribs distantly spaced perplexum 



CHONDROPOMETES (CHONDROTHYROMA) SCOPULORUM CUMBRENSE, new subspecies 



Plate 12, Figure 10 



Shell small, yellowish white with the ribs rather distantly spaced 

 and the spiral threads on the umbilicus rather prominent. There 



