76 BULLETIN 181, UNITEiD STATEiS NIATTONIAL MUSEUM 



We have many additional lots collected by Charles R. Orcutt from 

 the same general region. 



The small size and the depressed-helicoid form will differentiate 

 this from all the other members of the genus. 



CYCLOPILSBRYA (CYCLOPILSBRYA) JUGOSA (C. B. Adams) 

 Plate 12, Figures 33-35 ; Plate 42, Figukes 11-13 



1852. Cyciostoma jugosum C. B. Adams, Ann. Lye. Nat. Hist. New York, vol. 5, 



p. 59. 

 1852. Cyclotus jugosus Pteitfeb, Monographia pneumonopomorum viventlum, 



vol. 1, p. 27. 

 1857. Cyclotus jugosus parva Chitty, Proc. Zool. Soc. London, vol. 25, p. 156. 

 1898. Neocyclotus (Plectocyclotus) jugosus Kobelt and Mollkndoetf, Nachrb. 



deutschen malak. Ges., vol. 2.9, p. 138, reprint. 



Shell very large, decidedly depressed-helicoid, almost planorbid, 

 covered with a pale brown periostracum. The nuclear whorls are 

 flesh colored, the succeeding whorls reddish, gradually paling to flesh 

 color. The nucleus consists of 1.6 inflated, well-rounded, smooth 

 whorls. The succeeding turns are marked by strongly elevated, slen- 

 der, very regular, slightly retractively curved axial riblets, which are 

 about one-third as wide as the spaces that separate them. On the 

 last turn and a half strong wrinkles make their appearance, which 

 are arranged in a peculiar zigzag pattern, the zigzagging being very 

 broad. These wrinkles are about as wide as the spaces that separate 

 them. On the last half of the last turn the zigzag arrangement 

 becomes less conspicuous and the sculpture assumes more the character 

 of nodulation. Suture well impressed on all the turns. Periphery 

 well rounded and marked by the continuation of the sculpture of the 

 spire. Base inflated, strongly rounded, and marked with strong 

 oblique cords near the umbilicus, which have a protracted slant. The 

 rest of the base is marked by finer irregular cords, which are irregu- 

 larly distributed but very strongly developed. Umbilicus broad and 

 open. The umbilical wall is marked by strong, almost sublamellar 

 axial riblets and lines of growth. Aperture circular, oblique, slightly 

 protracted at the posterior angle ; outer lip of the peristome thin at 

 edge, the inner somewhat thickened. Operculum typically cyclo- 

 pilsbryid. 



The specimen figured, U.S.N.M. No. 100685, is one of a large series 

 collected by Orcutt between Ipswich and Springfield, near the 4-mile 

 milestone, St. Elizabeth Parish, Jamaica. It has 5.1 whorls and 

 measures : Height, 16.7 mm. ; greater diameter, 27.8 mm. ; lesser diam- 

 eter, 20.4 mm. 



This species is readily distinguished from C. (0.) striosa (Chitty) 

 by its very large size and irregular cording of the base. Chitty 

 described this as Cyclotus jugosus farva. We find that the size of 



