THE CYCIiOPHORID LAND M0LLUS1K9 OF AMEIRI'OA 73 



periostracum. The nucleus consists of 1.5 well-rounded smooth turns. 

 The postnuclear whorls are inflated, strongly rounded, and marked 

 by rather irregular wrinkled axial riblets. In addition to this, be- 

 ginning with the second half of the first postnuclear whorl, wrinkles 

 irregular in size and distribution make their appearance. These are 

 rather coarse, particularly so on the last whorl. Suture well im- 

 pressed, a little less so on the last part of the last whorl. Periphery 

 well rounded and marked by the continuation of the wrinkles. Base 

 inflated, strongly rounded, openly umbilicated with a low keel marking 

 the outer edge of the umbilicus. The entire base is marked by very 

 strong wrinkles, which almost assume the form of nodules, the spaces 

 between them being strongly impressed pits. The umbilical wall is 

 marked by coarse, low, rounded, broad ribs which in turn are crossed 

 by the incremental lines. Aperture circular, protracted into an angle 

 at the posterior angle ; outer lip of the peristome thin, the inner rather 

 thickened. Operculum typically cyclopilsbryid. 



The type, U.S.N.M. No. 57764, was received from C. B. Adams. 

 It has 4.9 whorls and measures : Height, 9.9 mm. ; greater diameter, 

 14.2 mm. ; lesser diameter, 11.0 mm. 



No definite locality accompanies this specimen, but the same species 

 was obtained by Henderson near Kings, Westmoreland Parish, 

 Jamaica, which is the only locality we have for it. Kings is on the 

 south coast of Westmoreland near the boundary of St. Elizabeth 

 Parish. 



CYCLOPILSBRYA (CTCLOPILSBRYA) GLENBURNIENSIS, new species 



Plate 12, Figubes 18-20 



Shell large, helicoid, the denuded specimens soiled yellowish white. 

 The nucleus consists of almost 1.5 well-rounded smooth turns. The 

 postnuclear whorls are well rounded and marked by retractively 

 curved, closely approximated, rather broad axial riblets, which are 

 quite regular on the early whorls but become sinuous and slightly 

 irregular on the last whorl. Beginning with the middle half of the 

 penultimate whorl wrinkles make their appearance. These gain in 

 strength with the increasing whorls, but again fade out on the last 

 one-tenth of the last turn. These wrinkles are irregular in strength 

 and distribution and extend in a more or less zigzag pattern from 

 the summit toward the periphery in the best-developed portion. Su- 

 ture well impressed except on the last half of the turn, which creeps 

 up on the preceding whorl. Periphery well rounded. Base strongly 

 rounded, moderately broadly openly umbilicated, with a very strong 

 keel marking the outer edge of the umbilicus. The umbilical side 

 of this keel is limited by a decided excavation. On the outside a 

 series of rather distantly spaced, protractively curved, short, stout 



