164 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



wall. Operculum with central nucleus and a decidedly flaring, moderately 

 elevated spiral lamella. 



The type (U.S.N.M. No. 504139) was collected by Gerrit S. Miller, 

 Jr., in the Bahoruco Mountains, at Polo, Earahona District, Dominican 

 Republic, at an elevation of 2,000 feet. It has 3.3 whorls remaining and 

 measures : Height, 4.8 mm. ; greater diameter, 3.2 mm. ; lesser diameter, 

 2.8 mm. 



This species is most nearly related to W einlandipoma meridianum, 

 from which it can readily be differentiated by its smaller size and much 

 more numerous axial ribs. 



U.S.N.M. No. 389878 contains 22 topotypes from the same source. 



WEINIiANDIPOMA MEBIDIANU3I, new gpecies 



Plate 28, Figure 8 



Shell very small, thin, flesh-colored, with three interrupted, faint 

 spiral bands of brown, of which one is a little below the summit, another 

 a little below the middle, and the last at the periphery of the turn. Nu- 

 clear whorls 2, forming a mammillated apex. The postnuclear whorls are 

 strongly rounded and marked by slender lamellose axial ribs, which are 

 slightly expanded into auricles at the summit. Of these ribs, 36 are 

 present on the last turn. These ribs are not scalloped. Occasionally a fine 

 axial thread occurs between these ribs, while the broad intercostal spaces 

 are marked with exceedingly fine, microscopic spiral lirations about as 

 wide as the spaces that separate them. Suture strongly constricted. Pe- 

 riphery well rounded. Base short, well rounded, openly umbilicated, and 

 marked by the continuation of the axial ribs, which extend strongly over 

 the umbilical wall. Both base and umbilical wall are also marked by the 

 spiral lirations. The last whorl is solute for about two-tenths of a turn. 

 Aperture circular; peristome double, the inner slightly expanded; the 

 outer narrowly expanded, a trifle wider at the posterior angle than on 

 the rest and marked by several concentric lamellae. Operculum with 

 central nucleus and a quite strongly elevated, broadly flaring, obliquely 

 directed spiral lamella. 



The type (U.S.N.M. No. 504138) was collected by Orcutt on the 

 Gimbi River in the neighborhood of Saltrou, Haiti. It has 4 whorls re- 

 maining and measures : Height, 5.7 mm. ; greater diameter, 3.3 mm. ; 

 lesser diameter, 2.9 mm. 



U.S.N.M. No. 402168 contains 18 topotypes from the same source. 



U.S.N.M. No. 401994 contains 17 specimens collected by Orcutt on 

 the east side of the Gimbi River. 



U.S.N.M. No. 402552 contains 13 specimens collected by Orcutt in the 

 Gimbi Mountains. 



U.S.N.M. No. 420506 contains 67 specimens collected by Orcutt on 

 the road between Bodarie and Saltrou. 



