148 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



ABBOTTEL,L,A MOBELETIANA WETMOBEI, new subspecies 



Plate 26, Figures 8-10 



This, the smallest subspecies of Abbottella moreletiana, was collected 

 by Dr. A. Wetmore on Pelican Keys, San Lorenzo Bay, Samana Bay, 

 Dominican Republic. It is easily differentiated, in addition to its small 

 size, from the other members by having the summit of the whorls almost 

 appressed; the suture therefore is scarcely channeled. 



The type (U.S.N.M. No. 504119) has 4.5 whorls and 39 strong lamel- 

 lar axial ribs on the last whorl, which bear 8 spiral threads between the 

 summit and the periphery, 6 on the base, and 5 on the umbilical wall. It 

 measures: Height, 5.8 mm.; greater diameter, 7.0 mm.; lesser diame- 

 ter, 5.4 mm. 



U.S.N.M. No. 367247 contains 34 topotypes from the same source. 



U.S.N.M. No. 504121 contains 13 specimens collected by Wesley 

 Newcomb on Pajarito Island, Samana Bay. 



ABBOTTELLA MOBELETIANA GABBIELLA, new subspecies 



Plate 25, Figures 4-6 



This race, while nearest in location to A. m. wetmorei, which it re- 

 sembles somewhat in smallness although it is larger than xvctmorei, can 

 easily be differentiated from it by its deeply channeled suture. 



The type (U.S.N.M. No. 504124) was collected by Gerrit S. Miller, 

 Jr., on San Gabriel Isle, Samana Bay. It has 53 lamellar axial ribs on 

 the last whorl, 8 spiral threads between the summit and the periphery, 

 4 on the base, and 5 on the umbilical wall. It measures : Height, 7.0 mm. ; 

 greater diameter, 8.6 mm. ; lesser diameter, 6.7 mm. 



U.S.N.M. No. 369127 contains 335 topotypes from the same source. 



U.S.N.M. No. 504125 contains 107 specimens collected by Dr. W. L. 

 Abbott on San Gabriel Isle. 



U.S.N.M. No. 203638 contains 3 specimens from the Ulrich Collec- 

 tion. 



ABBOTTELL.'V S.4MANENSI8, new species 



Plate 25, Figures 7-9 



Shell depressed-helicoid, pale brown, with the expanded peristome 

 paler and rayed. Nuclear whorls 2, well rounded, minutely granulose. 

 Postnuclear whorls strongly rounded and marked by slender, retrac- 

 tively curved axial ribs, of which 182 are present on the last whorl. In 

 addition to the axial ribs, the whorls are marked by spiral cords of two 

 strengths, heavier ones alternating with finer threads. This lends to the 

 surface a very striking pattern. There are 19 spiral cords on the last 

 whorl between the summit and the periphery. The junctions of the axial 

 ribs and spiral cords form strong nodules, the strength of which depends 

 upon the spiral cord in question. Suture strongly channeled. Periphery 



