244 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



rated. Suture deeply channeled. Periphery well rounded. Base short, well 

 rounded, openly umbilicated, and marked by eight spiral cords and the 

 continuation of the axial ribs. Within the umbilicus additional spiral 

 cords are present. Aperture oval, slightly auriculated at the posterior 

 angle; peristome double, the outer expanded, more broadly so on the 

 inner lip and less so on the outer lip which is denticulated; inner peri- 

 stome moderately exserted and reflected. Operculum typically coloninid. 



The species comes from the Island of Inagua. 



I am recognizing two subspecies, which the following key will help 

 to differentiate : 



KEY TO THE SUBSPECIES OF COLONINA BRYANTI 



Shell large, length of decollated shell more than 14 mm bryanti 



Shell small, length of decollated shell less than 10 mm minor 



COIiONINA BKYANTI BBYANTI (Pfelffer) 



Plate 38, Figure 10 



1867. Cienopoma bryanti Pfeiffer, Malak. Blatter, vol. 14, pp. 130-131. 

 1920. Chondropoma (Chondropoma) bryanti Henderson and Bartsch, Proc. 

 U. S. Nat. Mus., vol. 58, p. 62. 



This subspecies occupies the outer north coast region of the Island of 

 Inagua and is easily differentiated from the other subspecies by its much 

 greater size. 



The type (U.S.N.M. No. 536836) was collected by Bartsch at North- 

 east Point, Inagua. It has 4.5 whorls remaining and measures: Length, 

 15.0 mm.; greater diameter, 9.5 mm.; lesser diameter, 8.0 mm. 



U.S.N.M. No. 391067 contains i topotype from the same source. 



I also collected the following specimens: 



U.S.N.M. No. 392165, 5 specimens from the west coast south of 

 Northeast Point, east of Salt Lagoon. 



U.S.N.M. No. 390224, 3 specimens from Carmichael Point. 



U.S.N.M. No. 391709, 4 specimens from flat west of Salt Pond Hill. 



U.S.N.M. No. 390692, 21 specimens from flat south of Salt Pond Hill. 



U.S.N.M. No. 390257, 32 specimens from Salt Pond Hill. 



U.S.N.M. No. 383355, 21 specimens from halfway between Palmetto 

 and Carmichael Points. 



U.S.N.M. No. 390718, I specimen from the outer beach, north point 

 of Ocean Bight. 



U.S.N.M. No. 392170, 18 specimens from the center of Ocean Bight. 



COLONINA BRYANTI MINOB, new subspecies 



Plai-e 38, Figure 6 



I collected this subspecies on the south coast of Great Inagua. It 

 differs from the typical subspecies in being decidedly smaller. 



The type (U.S.N.M. No. 392160) I collected at Conch Shell Point. 

 It has 3.6 whorls remaining and measures : Length, 9.3 mm. ; greater 

 diameter, 6.3 mm. ; lesser diameter, 5.2 mm. 



