76 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



contricted. Periphery inflated, well rounded. Base moderately long, nar- 

 rowly openly umbilicated, and marked by the continuation of the axial 

 ribs and on the outer half of the umbilical wall by four spiral cords, 

 which grow consecutively stronger from the outermost inward. Aper- 

 ture oval, slightly angulated at the posterior angle; peristome simple. 

 Operculum typically crossepomid. 



The type (U.S.N.M. No. 38o353) w^as collected near Anse a Veau, 

 Haiti, by Eyerdam. It has 5 whorls remaining and measures : Height, i6.i 

 mm. ; greater diameter, y.3 mm. ; lesser diameter, 6.5 mm. 



Additional specimens in our collection show that the species ranges 

 from Anse a Veau along the coast westward to Trou Rousselin at the 

 western end of the peninsula. 



The species is easily distinguished from its neighbor, C. emilianum, 

 by its much more distantly spaced axial ribs. 



U.S.N.M. No. 503998 contains i specimen collected by Henderson 

 and Bartsch at Roseau. 



U.S.N.M. No. 383227 contains 4 specimens collected by Orcutt at 

 Jeremie. 



U.S.N.M. No. 401730 contains 139 specimens collected by Orcutt 

 between Anse du Clerc and Trou Bonbon. 



U.S.N.M. No. 404079 contains 2 specimens collected by Orcutt on a 

 limestone cliff near the shore west of Trou Rousselin. 



CROSSEPOMA EMILIANUM (Weinland) 



Shell elongate-conic, varying in ground color from pale bufif to brown, 

 marked by interrupted, or sometimes solid, spiral bands of brown; the 

 interior of the aperture may vary from pale bufif to pale brown with 

 the peristome usually soiled white. The nuclear whorls form a blunt 

 apex that consists of 2.5 turns, which are strongly rounded and smooth 

 except for the last portion of the last turn, which shows the beginning 

 of the postnuclear sculpture. Postnuclear whorls well rounded, marked 

 by closely spaced, retractively slanting axial riblets, which are usually 

 a little wider than the spaces that separate them. The axial riblets are 

 either expanded or several of them are gathered into hollow tufts at 

 the summit. The spiral sculpture consists of obsolete ill-defined nodules, 

 which render the axial riblets slightly wavy. Suture well constricted, 

 rendered wavy by the tufts at the summit of the turns. Periphery 

 strongly rounded. Base short, openly narrowly umbilicated, well rounded, 

 and marked by the continuation of the axial riblets within the umbilicus 

 and by moderately strong spiral threads. Aperture oval ; peristome 

 simple, slightly reflected. Operculum with the nucleus halfway between 

 submarginal and subcentral, marked by slender, retractively slanting, ill- 

 defined lamellae, which are fused on their inner and outer edges, which 

 are slightly elevated, and which terminate about two-fifths from the 

 outer margin of the chondroid basal plate of the turns, leaving a de- 

 cided unribbed space between the turns. 



