HISPANIOLAN AND BAHAMAN ANNULARIIDAE 61 



CHONDROPOMA (CHONDROPOMA) QUISQUENSE, new species 



Shell ovate, varying from flesh-colored to pale orange, unicolor 

 or marked with faint interrupted spiral streaks or zones or spots of 

 brown. Peristome white. The nuclear whorls are decollated in all our 

 specimens. The postnuclear whorls are well rounded, very narrowly 

 shouldered at the summit, and marked by numerous very closely ap- 

 proximated, slender, slightly retractively curved axial riblets and equally 

 fine and closely spaced, spiral threads, which make the spaces inclosed 

 between them appear thimble-pitted; the junction of the two scarcely 

 forms nodules, but at the summit of the whorls the riblets become 

 slightly intensified and render this crenulated. The periphery of the last 

 whorl is well rounded. The base is rather short, inflated, well rounded, 

 openly umbilicated, and marked like the spire, but here the sculpture is 

 a little more enfeebled. Within the umbilicus the wall is marked by 

 slender spiral threads, while the axial sculpture is reduced to mere 

 incremental lines. The last whorl is solute for a fraction of a turn, and 

 the posterior angle behind the peristome marks a sharp carina. The 

 peristome is double ; the outer is rather broadly expanded at the basal 

 and outer lip, forming a conspicuous auricle at the posterior angle. On 

 the inner lip the outer peristome is quite narrow ; the inner peristome 

 is slightly exserted and reflected and appressed at the outer. Operculum 

 thin, corneous, paucispiral. 



This species comes from the Barahona Peninsula, Dominican Re- 

 public, and we have two races before us, which the following key and 

 diagnosis will differentiate : 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMA) QUISQUENSE 



Last whorl decidedly solute quisquense 



Last whorl almost appressed sculptior 



CHONDROPOMA (CHONDROPOMA) QUISQUENSE QUISQUENSE, new subspecies 



Plate 11, Figure 1 



In this race, which was collected by Dr. W. L. Abbott at Trujin in 

 the southeastern portion of Barahona Province, Dominican Republic, 

 the last whorl is very decidedly solute and the umbilicus more open than 

 in Chondropoma (Chondropoma) quisquense sculptior. 



The type (U.S.N.M. No. 471954) has 4 whorls remaining and meas- 

 ures: Length, 15 mm.; greater diameter, 9.2 mm.; lesser diameter, 

 7.6 mm. 



U.S.N.M. No. 471955 contains -zy topotypes from the same source. 



CHONDROPOMA (CHONDROPOMA) QUISQUENSE SCULPTIOR, new subspecies 



Plate 11, Figure 2 



This race was collected by Dr. W. L. Abbott in the mountains near 

 Maniel Viejo, in Barahona Province, Dominican RepubUc, at an altitude 

 of 2,500 feet. It dififers from Chondropoma (Chondropoma) quisquense 



