70 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



CHONDHOPOMA (CHONDBOPO>IA) VANATTAE Pilsbry 



Shell ovate, very pale brown, with irregular zones of a little darker 

 brown, the latter disposed in a more or less axial manner; there are in 

 addition to this interrupted pale brown bands in the channels between 

 the spiral threads, of which the one near the summit is the most con- 

 spicuous. There is also an almost continuous band of brown a little inside 

 of the outer termination of the umbilicus. The inside of the aperture 

 shows these brown bands, which become somewhat intensified on the 

 outer peristome. The summits of the nuclear whorls are dark reddish 

 brown. Nuclear whorls 2, forming an almost truncated apex, smooth 

 except for the last portion of the last turn, which is marked by a few 

 slender axial threads. The postnuclear whorls are inflated, strongly 

 rounded, and marked by retractively slanting axial riblets, which are 

 about one-fourth as wide as the spaces that separate them on the early 

 turns, and about half as wide on the last. These riblets become intensified 

 at the summit into slender cusps. The spiral sculpture consists of low, 

 rounded threads about as strong as the axial riblets, the junctions of 

 the two forming feeble nodules, while the spaces enclosed between them 

 are squarish pits. The surface of the last whorl is not unlike that of a 

 piece of coarsely, openly woven cloth. Suture well impressed. The pe- 

 riphery of the last whorl is strongly rounded. The base is moderately 

 long, inflated, strongly rounded, openly umbilicated, and marked by the 

 continuations of the axial ribs and spiral threads equaling those on the 

 spire or even a little stronger. The umbilical wall shows four spiral 

 threads a little stronger than those on the rest of the base near the outer 

 margin. The last whorl is solute for about one-twentieth of a turn. 

 Aperture large, very broadly oval; peristome simple, narrowly expanded 

 and slightly reflected, more so on the outer and basal lip than on the 

 columellar and parietal wall ; the latter may be adnate to or free from 

 the preceding turn. Operculum paucispiral with almost subcentral 

 nucleus, the outside covered with a thin deposit of fine calcareous gran- 

 ules which are absent at the margin. 



This species ranges from Fonds Verettes, Haiti, south to Maniel Viejo, 

 Dominican Republic, I am recognizing two subspecies, which the fol- 

 lowing key will help to differentiate: 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDHOPOMA) VANATTAE 



Last whorl solute vanattae 



Last whorl not solute verettense 



chondbopoma (chondropoma) vanattae vanattae pusbry 



Plate 12, Figure 3 



1933. Chondropoma vanattae Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, vol. 

 85, p. 124, pJ. 6, figs. 8, 9. 



Dr. Pilsbry 's type (Acad. Nat. Sci. Phila. No. 160979) and a speci- 

 men in our collection (U.S.N.M, No. 426047) were collected by Daniel 



