332 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



The type, U.S.X.M. no. 4930G4, has 3.2 whorls remaining and 

 measures : Length, 11.9 mm ; greater diameter, 7.4 mm ; lesser diam- 

 eter, 6.2 mm. 



CHONDROPOMA (CHONDROPOMA) PERLATUM (Gundlach) Poey 

 Platk 30, FiGT-RE 12 



1858. Cyclostoma pcrhitum Poey, Memories sobre historia natural de la Isla de 



Cuba, p. 38. 

 1858. Chondropo)iia pcrlaium Pfmffer, Monographia pneumouopomorum vivea- 



tium, suppl. 1, p. 144. 



Shell elongate-conic, thin, pale horn-color, Avith interrupted spiral 

 bands of brown ; the dots composing these bands are placed at con- 

 siderable distances apart in the spiral series. They are also arranged 

 in axial series and are present on both spire and base, and show 

 within the aperture, which is a trifle paler inside than outside. Peri- 

 stome soiled white. At the summit of the whorls there are low, feebly 

 developed, distantly spaced denticles of whitish color. Nuclear 

 whorls 2.2, strongly inflated, rounded and smooth, except the last 

 portion, which shows the feeble beginnings of the postnuclear sculp- 

 ture. Postnuclear whorls well rounded and marked by rather dis- 

 tantly spaced, acute, slender spiral keels, of which 5 are present on 

 the first of the remaining turns in the specimen described, and 9 

 on the last turn. The axial sculpture is reduced to mere lines of 

 growth on the last turn, being a trifle stronger on the early turns. 

 Suture moderately constricted. Periphery strongly rounded. Base 

 strongly rounded, narrowly openly umbilicated, and marked like 

 the spire. Interior of the umbilicus also marked by spiral cords, 

 but here they are a little broader and more closely spaced. Aper- 

 ture broadly ovate, slightly oblique; peristome double, the outer 

 broadly expanded on the inner lip, a little less so on the basal and 

 still less so on the outer lip, not conspicuously auriculated at the 

 posterior angle; on the parietal wall it is very narrow and adnate to 

 the preceding turn; the outer peristome is composed of a series 

 of concentric lamellae ; inner peristome a little thicker than the outer, 

 moderately elevated above it, slightly expanded and slightly re- 

 flected. Operculum thin, corneous, paucispiral with submarginal 

 nucleus, the outside covered with a thin deposit of fine calcareous 

 granules. 



The specimen described and figured, U.S.N.M. no. 493071, is a 

 cotype from District Limonar near Matanzas, Cuba. It has a little 

 more than 4 whorls and measures : Length, 15.2 mm; greater diameter, 

 9.0 mm ; lesser diameter, 7.2 mm. 



