112 BULLETIN 181, LTNTTE© SITATEiS NAT10!N)A;L MUSEUM 



Periphery well rounded. Base very broadly openly umbilicated, with 

 a very weak cord marking the outer limit of the umbilicus. The sculp- 

 ture of the base between the periphery and this cord consists of 

 obsolete wrinkles, which tend toward spiral disposition. The um- 

 bilical area is marked by coarse ribs and fine incremental lines. Aper- 

 ture subcircular, somewhat effused at the junction of the outer and 

 basal lip, protracted into an angle at the posterior angle; outer 

 lip thin, the inner somewhat thickened. Operculum typically poterid. 



The specimen figured, U.S.N.M. No. 356125, was received from C. B. 

 Adams, bearing the label "Jamaica" without definite locality. It 

 has 4.9 whorls and measures : Height, 16.7 m.. ; greater diameter, 27.2 

 mm. ; lesser diameter, 19.8 mm. 



The species seems to be confined to northeastern St. Elizabeth Par- 

 ish, Jamaica. In general shape it recalls P. {P.) corrugatissima 

 (Chitty), but the coarseness of the wrinkles on the upper surface and 

 their arrangement in a protractive and retractive series will at once 

 distinguish it. It can also be differentiated from corrugatissima by 

 the absence of the strong umbilical keel and in having the basal sculp- 

 ture also much less strongly developed. 



POTERIA (POTERIA) JAMAICENSIS (Gray) 

 Plate 1G, Figxires 4-6 



1828. Cyclostoma jamaicense Grat, in Wood, Index testaceologicus, ed. 2, Suppl., 

 p. 36, pi. 6, fig. 3 (not Turbo jamaicensis Chemnitz, 1795, nonbinominal ; or 

 Cyclostoma jamaicense Sowerby, 1843). 



1857. Cyclotus novussaltus Chitty, Proc. Zool. Soc. London, vol. 25, p. 154. 



Shell moderately large, helicoid, covered with an elevated brownish 

 periostracum, which is rendered spotted by wearing of the axial riblets. 

 The nucleus consists of a little more than a single well-rounded, mod- 

 erately elevated turn. The postnuclear whorls are marked by a strong 

 retractively curved axial riblets, which assume the strength of low, 

 appressed, retractively slanting lamellae on the last turn. Suture well 

 impressed on all but the last whorl, which is appressed to the preced- 

 ing turn. Periphery well rounded, crossed by the axial ribs. Base 

 somewhat inflated, well rounded, openly umbilicated, with a weak 

 broad cord at the outer edge of the umbilicus. The base is marked by 

 the continuation of the axial sculpture. The umbilical wall is marked 

 by rather strong, distantly spaced axial ribs and fine incremental lines. 

 Aperture circular, decidedly protracted at the posterior angle; peri- 

 stome thin all around. Operculum typically poterid. 



The specimen figured, U.S.N.M. No. 356077, is one of three received 

 from C. B. Adams. It has 5.2 whorls and measures: Height, 17.0 

 mm.; greater diameter, 24.7 mm.; lesser diameter, 19.0 mm. 



