86 BULIiETinsr ISl, UlSriTE© STATEIS NlATIOiNlAlL MTJSIETJM 



rounded. Base strongly rounded, moderately broadly openly 

 umbilicated, with a strong broad keel limiting the outer termination 

 of the umbilicus. The posterior half of the base is decidedly wrinkled, 

 almost to the very edge of the peristome. On the anterior half the 

 wrinkling is almost absent. The umbilical keel is rendered somewhat 

 notched by the axial sculpture. The umbilical wall is marked by fairly 

 strong axial riblets and lines of growth. Aperture subcircular, 

 angulated at the posterior angle and slightly effuse at the junction of 

 the basal and outer lip. The outer lip is thin; the inner, some- 

 what thickened. Operculum typically ptychocochlid. 



The type, U.S.N.M. No. 398343, is one of a series collected by Orcutt 

 at Hermitage Dam, Jamaica, that is, on the main road between Con- 

 stant Spring and Stony Hill, St. Andrew. It has 5 whorls and 

 measures: Height, 18.7 mm.; greater diameter, 25.2 mm.; lesser 

 diameter, 18.8 mm. 



The larger size, less open umbilicus, and more elevated form, as well 

 as the feebler nodulation, will readily distinguish this species from 

 P. corrugatior. 



PTYCHOCOCHLIS VARIANS (C. B. Adams) 

 Pr^TE 13, FiGLTRES 40-42 



1852. Cyclostoma variavs C. B. Adams, Ann. Lye. Nat. Hist. New York, vol. 5, 



p. 59. 

 1852. Cyclotus various Pfeiffer, Monographia pneumonopomorum viventium, 



Suppl. 1, p. 27. 

 1898. Neoayclotiis (PlectocifclotHs) varians Kobelt and Mollendorff, Nachrb. 



deutschen malak. Ges., vol. 29, p. 139, reprint. 



Shell of medium size, soiled flesh colored, covered by a pale brown 

 periostracum. The nuclear whorls appear to vary from flesh colored 

 to reddish. Tlie nucleus consists of a little more than a turn, which 

 is smooth and well rounded. The postnuclear whorls are strongly 

 rounded ; the first is marked by slender, retractively curved axial rib- 

 lets, which are not quite so wide as the spaces that separate them. 

 Beginning with the second postnuclear whorl, strong, oblique, protrac- 

 tively curved ridges make their appearance. These continue to the 

 early part of the last whorl. These ridges do not extend quite to the 

 summit but stop at about one-fourth of the distance between the 

 summit and periphery, anterior to the summit. The spaces separat- 

 ing these ridges are about equal to the ridges. They, as well as the 

 ridges, are crossed by the slender axial riblets. On the last whorl 

 the oblique ridges gradually disappear and are replaced by irregular 

 wrinkles that appear to be without definite direction. This sculpture 

 extends almost to the peristome. The suture is well impressed on all 

 but the last turn, which is appressed at the summit. Periphery well 



