HISPANIOLAN AND BAHAMAN ANNULARIIDAE 21 



on the base. The nuclear whorls are decollated in all our specimens. 

 The postnuclear whorls are well rounded and marked by rather strong, 

 somewhat sinuous, retractively slanting axial riblets, which are gathered 

 into short tufts at the summit. In addition to the axial riblets, the whorls 

 are marked by spiral threads, which are of somewhat variable strength 

 and which render the axial riblets weakly nodulose. The spaces en- 

 closed between the axial riblets and spiral threads are rectangular pits 

 having their long axis parallel with the axial sculpture. Suture moder- 

 ately constricted. The base is well rounded, openly umbilicated, and 

 marked by the continuation of the axial riblets and spiral threads, the 

 latter becoming stronger from the periphery toward the umbilicus, where 

 they are rather distantly spaced, the one marking the outer limit of the 

 umbilicus being much stronger than the rest. The umbilical wall varies 

 in the expression of its spiral sculpture in the different subspecies. The 

 last whorl may be adnate to the preceding whorl or solute. Aperture 

 broadly oval; peristome double, the outer moderately expanded and re- 

 flected, considerably more so on the outer hp than on the inner, slightly 

 sinuous at the edge of the basal and outer lip; inner peristome strongly 

 projecting above the outer and slightly reflected at the outer and basal 

 lip. 



Of this species Hjalmarson says: "Under fallen leaves on the roots 

 of Carica papaya, usually in pairs." 



This species we have seen from a number of stations on the south 

 side of the Cordillera Septentrional, Dominican Republic. I am recogniz- 

 ing three subspecies, which the following key will help to differentiate : 



KBY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMORUS) CARICAB 



Last whorl decidedly solute sosuense 



Last whorl not solute. 



Axial ribs closely crowded navarretense 



Axial ribs not closely crowded caricae 



CHONDROPOMA (CHONDROPOMOBUS) CARICAE SOSUENSE, new subspecies 



Plate 3, Figure 4 



This race was collected by Dr. W. L. Abbott at Sosua, 17 miles east 

 of Puerto Plata, Dominican Republic. In this form the last whorl is 

 decidedly solute for about one-fifth of a turn, and the axial ribs are 

 very closely spaced and strongly developed at the summit. The spiral 

 threads, too, are numerous, equaling the axial riblets in strength. The 

 umbilical wall also has strongly pronounced spiral threads, which seem 

 to be absent in the other two subspecies. The inner peristome is very 

 strongly exserted, much more so than in the other races. 



The type (U.S.N.M. No. 336770) has 5.3 whorls remaining and 

 measures: Length, 13.3 mm.; greater diameter, 6.2 mm. ; lesser diameter, 

 4.8 mm. 



