146 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



on the road to Grand Bois, 4 miles north of Thomazeau, Haiti, at an 

 elevation of 1,000 feet. It has 4.4 whorls and measures : Height, 7.0 mm. ; 

 greater diameter, 12.7 mm. ; lesser diameter, 9.5 mm. 



U.S.N.M. No. 5041 12 contains 10 topotypes from the same source. 



This species belongs to the group of Abbottella moreletiana, from 

 which it differs by having the junction of the axial ribs and spiral threads 

 nodulose, not spinulose. 



ABBOTTEL,L,A MOBEIiEfTIANA (Crosse) 



Shell depressed-helicoid, with broad, open, funnel-shaped umbilicus. 

 The axial sculpture consists of lamellar ribs between which finer threads 

 are present. The spiral sculpture consists of feeble threads that render 

 the axial ribs sharply spinulose at their intersection. This type of sculp- 

 ture is characteristic of both spire and base; the spinuloseness is, how- 

 ever, absent on the umbilical wall. The suture may be deeply and broadly 

 channeled or almost appressed. Aperture circular with the inner peris- 

 tome exserted and the outer broadly flaringly expanded. The width of 

 the peristome varies in the different races. Operculum with central 

 nucleus and a very strongly elevated oblique lamella. 



The species ranges over Samana Peninsula and the southern part of 

 the Dominican Republic. It breaks up into a number of zoogeographic 

 races, which the following key and descriptions will help to differentiate : 



KEY TO THE SUBSPECIES OF ABBOTTELLA MORELETIANA 



Outer peristome of inner lip very broadly expanded. 



Shell decidedly depressed kriegeri 



Shell not decidedly depressed. 



Greater diameter more than 10 mm. 



Spiral threads between summit and periphery 6. . . . moreletiana 

 Spiral threads between summit and periphery 10.. domingoensis 



Greater diameter less than 8 mm wetmorei 



Outer peristome of inner lip not very broadly expanded gabriella 



ABBOTTELLA MORELETIANA KBIEGEBI, new subspecies 



Plate 24, Figures 4-6 



Shell decidedly depressed, with very broadly channeled suture. In the 

 type there are 58 of the lamellar axial ribs on the last whorl, 7 spiral 

 threads between the summit and periphery, and 3 on the umbilical wall. 



The type (U.S.N.M. No. 504115) has 3.3 whorls remaining and 

 measures : Height, 4.0 mm. ; greater diameter, lo.o mm. ; lesser diameter, 

 7.0 mm. It was collected by H. W. Krieger on the north side of the 

 Samana Peninsula on the center of the south side of San Juan Bay, 

 Dominican Republic. 



U.S.N.M. No. 499179 contains 31 topotypes from the same source. 



