80 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



OBOSSEPOMA AUSXBAXB AUSTKAL£, new sabspecies 



Plate 13, Figure 5 



This subspecies ranges along the south coast of the south peninsula 

 from Torbeck to Aquin, Haiti. It differs from C. a. vachense in having 

 the axial ribs much stronger and the tufts at the summit much more 

 strongly developed. There are also here only one feeble and two strong 

 spiral threads on the outer portion of the umbilical wall. 



The type (U.S.N.M. No. 504027) was collected by C. R. Orcutt be- 

 tween Vieux Bourg and Baie des Flamands. It has 4.3 whorls remain- 

 ing, the last of which bears no axial ribs, and measures: Height, 

 II. o mm. ; greater diameter, 6.2 mm. ; lesser diameter, 5.0 mm, 



U.S.N.M. No. 402457 contains 5 topotypes from the same source. 



U.S.N.M. No. 403650 contains i specimen collected by Orcutt at 

 Torbeck. 



U.S.N.M. No. 402796 contains 9 specimens collected by Orcutt at 

 St. Louis. 



U.S.N.M. No. 402827 contains 9 specimens collected by Orcutt east of 

 Aquin. 



U.S.N.M. No. 402679 contains 6 specimens collected by Orcutt east 

 of Morne Rouge. 



U.S.N.M. No. 402696 contains 19 specimens collected by Orcutt at 

 Morne Rouge. 



U.S.N.M. No. 402736 contains 2 specimens collected by Orcutt south 

 of Morne Rouge. 



U.S.N.M. No. 403463 contains i specimen collected by Orcutt on the 

 mountains east of Morne Rouge. 



CKOSSEPOMA JACMELiENSE, new species 



Shell varying from cylindroconic to broadly elongate-conic, marked 

 by retractively curved axial riblets, which are gathered into prominent 

 tufts at the summit. The spiral sculpture is indicated by feeble nodules 

 on the axial ribs, which are stronger on the early turns than on the rest. 

 Suture well constricted. Periphery well rounded. Base openly umbilicated 

 and marked by the continuation of the axial ribs and on the umbilical 

 wall by spiral threads. The last whorl is solute to a varying degree. 

 Aperture oval, slightly angulated at the posterior angle ; peristome simple 

 and slightly expanded and reflected. Operculum with strong, rather 

 distantly spaced, retractively curved, lamellar axial ribs, which are fused 

 on the inner and outer terminations. These ribs do not extend to the 

 outer limit of the turns of the basal chondroid plate but leave a space 

 between them. The species appears restricted to the south coast of the 

 south peninsula of Haiti. 



I am recognizing two subspecies, which the following key and de- 

 scriptions will help to differentiate : 



