HISPANIOLAN AND BAHAMAN ANNULARIIDAE 53 



ery of the last whorl inflated, strongly rounded. Base short, inflated, 

 strongly rounded, and marked like the spire. The umbilical wall has the 

 axial threads closely approximated and the spiral threads a little more 

 concentrated than on the spire. Aperture broadly ovate, almost sub- 

 circular. Peristome double, the outer broadly expanded of about the same 

 width all around except at the posterior angle, where it tends slightly 

 to auriculation ; it is marked with concentric lamellae. The inner 

 peristome is slightly exserted and narrowly reflected over the outer. 

 Operculum thin, corneous, paucispiral, with a slight deposit of cal- 

 careous granules on the outside. 



This species is represented by two subspecies, which occupy the 

 Barahona Peninsula of the Dominican Republic. These may be distin- 

 guished by the following key: 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMA) MANIELENSB 



Greater diameter more than 11 mm montivagfum 



Greater diameter less than 10 mm manielense 



CHONDROPOMA (CHONDKOPOMA) MANIEL,EN8E MONTIVAGUM, new subspecies 



Plate 10, Figure 2 



A series of specimens of this race was collected by Dr. W. L. Abbott 

 in the Bahoruco Mountains at an altitude of 3,500 feet, 2 miles north 

 of Maniel Viejo, Dominican Republic. 



This is a large race with the shell much broader and more widely um- 

 bilicated and with paler peristome and paler general coloration. 



The type (U.S.N.M. No. 471963) has 6.1 whorls remaining, and 

 measures: Length, 16.2 mm.; greater diameter, 11.7 mm.; lesser di- 

 ameter, 8.9 mm. 



U.S.N.M. No. 1 71964 contains 17 topotypes from the same source. 



CHONDBOPOMA (CHONDROPOMA) MANIELENSE MANIELENSE, new subspecies 



Plate 10, Figure 3 



A large series of specimens of this race was collected by Dr. W. L. 

 Abbott in debris among rocks by a small cave in a small savanna one 

 hour's walk west of Maniel Viejo, Dominican Republic. 



This race is distinguished from Chondropoma (Chondropoma) 

 manielense montivagum by its smaller size, less wide umbilication, and 

 darker-colored peristome. 



The type (U.S.N.M. No. 471962) has 4.3 whorls remaining and 

 measures: Length, 12. i mm.; greater diameter, 9.8 mm.; lesser diameter, 

 7.2 mm. 



U.S.N.M. No. 363826 contains 214 topotypes from the same source. 



U.S.N.M. No. 425505 contains 58 specimens collected by Dr. W. L. 

 Abbott at a cave near Maniel Viejo, at an altitude of 2,5oo feet. 



