CUBAN SUBFAMILY CHONDROPOMINAE — TORRE AND BARTSCH 361 

 Chondropomodes, new subgenus 



In this subgenus the shell is of ovate shape. The axial sculpture 

 consists of exceedingly slender, rather closely spaced, sublamellar 

 riblets, which are rendered sinuate by the slender spiral threads, the 

 combination producing a vertebrated aspect. These riblets are gath- 

 ered into tufts at the summit as in Chondropomoi^s. 



Type: Ghrondro'poma {Ghrondro'pomodes) santaluciense, new 

 species. 



KEY TO THE SPECIES OF SUBGENUS CHONDROPOMODES 



Outer peristome broadly expanded ernesti 



Outer peristome not broadly expanded santaluciense 



CHONDROPOMA (CHONDROPOMODES) SANTALUCIENSE, new species 

 Plate 35, Figube 5 



Shell elongate-ovate, when truncated ovate, pale buif with inter- 

 rupted spiral bands of brown. The dots composing these are very 

 distantly spaced and arranged also in axial series. On the inner lip 

 they are present, forming more or less confluent lines. Nuclear 

 whorls a little more tlian 2, well rounded, smooth; postnuclear 

 whorls well rounded, narrowly shouldered at the summit and marked 

 by slender, closely spaced, sublamellar axial riblets and feeble spiral 

 threads, which form, at the junction with the riblets, fine rounded 

 tubercles and give to the riblets a somewhat vertebrated appearance. 

 These riblets become fused at the summit of the whorls, where they 

 form firm sharp wliite denticles. Suture channeled. Periphery of 

 the last whorl well rounded. Base short, well rounded, and marked 

 like the spire but with the spiral threads becoming a little stronger 

 toward the open umbilicus whose parietal wall is marked by still 

 stronger spiral threads and the continuation of the axial riblets. 

 Aperture very broadly ovate; peristome double, forming a conspicu- 

 ous auricle at the posterior angle. The outer peristome reflected and 

 expanded; the inner also reflected and adnate to the outer, but not 

 quite reaching its margin. On the auricles at the posterior angle 

 there is a series of small lamellae indicating, evidently, a resting 

 stage growth of these elements. The last whorl is slightly solute. 

 Operculum thin, corneous, paucispiral, with marginal nucleus. 



The type, U.S.N.M. no. 468980, comes from the Portales Camayuin, 

 Arroyo Blanco, Santa Lucia, Oriente. It has 3.4 whorls remaining 

 and measures: Length, 12.1 mm; greater diameter, 9.5 mm; lesser 

 diameter, 7.3 mm. 



This species can be readily distinguished from Chondropoma 

 (Chotidropomodes) ernesti Pfeiflfer by its having a much less ex- 

 panded outer peristome. 



