THE CYCLOPHORID LAIsTD MOLLU&KS OF AIVIEIRI'OA 53 



the last whorl expanded into fimbriations. In shape and sculpture 

 the shells of this genus resemble Crocidopoma^ but they lack the 

 subsutural keel and the lirations within the umbilicus; they also re- 

 semble it in the fimbriations of the operculum, but here we have no 

 calcareous lamella. The verge likewise is of amphicyclotine pattern 

 in its attenuation. 



Type: Cyclohaitia haitia^ new species. 



The anatomy of Cyclohaitia shows the radula formula to be 

 3:3:3:3, and of the jaw is lacking the median points. The verge is 

 on the back of the neck behind the tentacles and traversed by a vas 

 deferens. The terminal appendage is long and threadlike, almost as 

 long as the basal portion. 



CYCLOHAITIA HAITIA, new species 



Plate 10, Figures 12-14 



Shell small, helicoid, openly moderately umbilicated, covered with 

 an olivaceous, wax-colored periostracum. Nuclear whorls 1.5, small, 

 well rounded, smooth, forming a moderately elevated apex. Post- 

 nuclear whorls strongly rounded, circular in cross-section, marked 

 by incremental lines and rather strong spiral cords, of which 5 are 

 present on the first, 7 on the second, and 9 on the last turn between 

 summit and periphery in the type. These cords vary somewhat in 

 strength and spacing. The whorls at the summit slope decidedly 

 toward the suture and render this very conspicuous. Periphery 

 strongly rounded. Base strongly rounded, marked by 9 spiral cords 

 equaling those of the spire, and the continuations of the incremental 

 lines. The umbilical wall does not have spiral cords, only the con- 

 tinuation of the lines of growth. Aperture slightly oblique, cir- 

 cular; peristome simple. Operculum chondroid, multispiral, with 

 the outer edge of the later whorls much produced to form a more 

 or less fimbriated, up-turned extension. 



The type, U.S.N.M. No. 535855, was collected north of Tiburon, 

 Haiti, along the road leading to Carcasse, south of the first village, 

 by C. E. Orcutt. It has 4.4 whorls and measures : Height, 5.2 mm. ; 

 greater diameter, 9.0 mm.; lesser diameter, 6.7 mm. Charles E. 

 Orcutt also collected 10 additional lots ranging from the type locality 

 eastward along the south coast of Haiti to the Bale des Flamands. 



Some of the dead specimens are much larger than the type. For 

 example U.S.N.M. No. 403722, from Damassin Eiver has 4.6 whorls 

 and measures: Height, 8.7 mm.; greater diameter, 12.0 mm.; lesser 

 diameter, 9.0 mm., but all intermediate sizes are present in lots from 

 the same locality. 



