HISPANIOLAN AND BAHAMAN ANNULARIIDAE 17 



CHONDROPOMA (CHONDROPOMOBUS) GNOTB GNOTE Pilsbry 



Plate 2, Figure 9 



1933. Chondropoma soror Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, vol. 85, 



p. 124, pi. 6, fig. 15 ; not Chondropoma soror Pilsbry, 1930. 

 1935. Chondropoma gnote Pilsbry, Nautilus, vol. 48, p. 144. 



We have this race from various locahties on the southwest side of 

 Samana Bay, centering about San Lorenzo Bay in the Dominican Re- 

 public. It is of slender outline, with the tufts at the summit decidedly 

 reduced, and has the interrupted spiral bands of brown irregularly de- 

 veloped, not forming a very definite axial pattern. The whole brown 

 spotting is dense and gives the shell a rather dark aspect. Here both the 

 axial and the spiral threads are decidedly reduced on the last whorl, 

 that is, they are only feebly expressed. 



In slenderness it resembles Chondropoma (Chondropomorus) gnote 

 kriegeri, from which the extreme reduction of the tufts at the summit 

 and its much darker coloration will differentiate it. 



The specimen figured is one of 22 specimens (U.S.N. M. No. 426037). 

 It was collected by Dr. W. L. Abbott a quarter of a mile from San 

 Lorenzo Bay. It has 5.5 whorls remaining and measures: Length, 

 14.3 mm. ; greater diameter, 7.6 mm. ; lesser diameter, 5.7 mm. 



U.S.N.M. No. 369104 contains 58 specimens collected by Gerrit S. 

 Miller, Jr., at Boca del Infierno, Samana Bay, Dominican Republic. 



U.S.N.M. No. 369148 contains 15 specimens collected by Mr. Miller 

 on the Upper Orange Keys, Samana Bay. 



U.S.N.M. No. 369137 contains 3 specimens collected by Mr. Miller 

 on Lower Orange Key, Samana Bay. 



CHONDROPOMA (CHONDROPOMORUS) COBONI, new speoies 



Plate 3, Figure 7 



Shell rather large, flesh-colored, with various spots, dots, and dashes 

 of brown, of which a series of oblique spots near the summit are stronger 

 than the rest. The rest are more or less disposed in spiral series, which 

 are present on both spire and base. The peristome shows these spiral 

 bands as blotches of brown at the edge. The nuclear whorls are decol- 

 lated. The whorls remaining are inflated, strongly rounded, and marked 

 by rather strong, retractively slanting axial riblets, which become some- 

 what strengthened at the summit, and not infrequently several of them 

 are gathered together to form low, rather broad tufts. In addition to 

 the axial sculpture, the whorls are marked by spiral threads, which 

 are about as strong as the axial ribs and render these slightly nodulose 

 at their junction. The spaces enclosed between the spiral threads and 

 axial ribs are squarish pits. The suture is well constricted. Periphery 

 feebly angulated. The base is short, broadly, openly umbilicated, well 

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

 threads equal to those on the spire. There are five spiral threads on the 



