HISPANIOLAN AND BAHAMAN ANNULARIIDAE 141 



decidedly solute and deflected, wax-yellow, and marked by interrupted 

 spiral lines of brown which vary materially in size and spacing; the 

 elements composing them also have an axial arrangement. Nuclear 

 whorls 1.9, well rounded, minutely granulose. Postnuclear whorls 

 strongly rounded and marked by strong, sublamellar axial ribs, of which 

 255 are present on the last whorl. Between these a number of finer hair- 

 lines are present. Suture strongly impressed. Periphery strongly rounded. 

 Base with a broad, funnel-shaped umbilicus and marked by the continua- 

 tion of the axial ribs, which extend over the umbilical wall. No spiral 

 sculpture is present on the entire shell. Aperture almost circular; peri- 

 stome double, the inner decidedly exserted ; the outer expanded, forming 

 an auricle at the posterior angle and wider on the outer lip than on the 

 inner. Operculum with almost central nucleus, having a strong lamella, 

 which is slightly outward bent, a little more so at the distal end, and 

 which is marked by retractively curved axial threads. 



The specimen described and figured (U.S.N.M. No. 504087), one of 

 189 specimens, was collected by Orcutt on limestone rocks 40 miles 

 south of Cap-Haitien. It has 4.7 whorls and measures: Height, 7.3 mm.; 

 greater diameter, 15. i mm.; lesser diameter, 10.2 mm. 



U.S.N.M. No. 403809 contains 188 specimens from the same locality. 



U.S.N.M. No. 364063 contains 92 specimens collected by E. C. 

 Leonard in crevices of limestone rock at the summit of the road between 

 Ennery and Plaisance, Haiti. 



U.S.N.M. No. 490087 contains 2 specimens collected by Henderson 

 at Plaisance, the type locality. 



This species can easily be differentiated from Rolleia haitcnsis by its 

 much more numerous and closely spaced axial ribs. 



ROLL.£IA HAIT£NSIS, new species 



Plate 23, Figures 7-9 



Shell very depressed-helicoid, almost lenticular, pale flesh-colored, with 

 interrupted spiral bands of brown whose elements are also arranged in 

 axial series. The axial arrangement is more emphasized than the spiral. 

 Nuclear whorls 2, well rounded, minutely granulose. Postnuclear whorls 

 strongly rounded, the last one decidedly solute and somewhat deflected. 

 The postnuclear whorls are marked by strongly sublamellar axial ribs, of 

 which 99 are present on the last turn. Between these axial ribs finer hair- 

 like threads are present. Suture well impressed. Periphery strongly 

 rounded. Base with an open funnellike umbilicus. The axial ribs continue 

 over the base and the umbilical wall. There is no spiral sculpture. Aper- 

 ture almost circular ; peristome double, the inner decidedly exserted ; the 

 outer broadly expanded on the outer lip, narrowly so on the inner and 

 auriculated at the posterior angle. Operculum with a central nucleus, 

 bearing a strongly elevated lamella which is sHghtly outward bent, whose 



