392 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



outer broadly expanded, not all in one plane, and somewhat flexuose, 

 decidedly auriculated at the j^osterior angle and slightly inbent at the 

 umbilicus, a little narrower on the parietal wall than on the rest of 

 the shell. Inner peristome slightly exserted and reflected over the 

 outer. Operculum thin, corneous, paucispiral, the nucleus halfway 

 between margin and subcentral covered with a thin deposit of cal- 

 careous granules on the outside. 



The type, U.S.N.M. no. 168902, an almost complete specimen, has 

 5.5 whorls remaining and measures : Length, 16.0 mm ; greater diam- 

 eter, 12.3 mm; lesser diameter, 8.9 mm. It was collected by Dr. 

 Vaughan at Los Negros, Oriente Province. 



This species is readily distinguished from the other members of 

 the genus by its decidedly channeled suture. 



CHONDROPOMA (GUTIERREZIUM) MONTANUM, new species 



Plate 37, Figure 2 



Shell broadly ovate, pale buff, marked by interrupted spiral bands 

 of brown, of which three occur on the whorls of the spire and three 

 on the base. These bands become conspicuous on the last portion 

 of the last whorl and lend to the inside of the outer lip and the 

 expanded peristome a very strongly banded aspect. Here an inter- 

 calated zone appears between the first basal and second, making 

 seven bands on the peristome. The elements composing the inter- 

 rupted spiral bands are arranged in both axial and spiral series. 

 Nuclear whorls 2.1, well rounded, smooth. Postnuclear whorls strongly 

 inflated, well rounded, marked by slender, decidedly retractively slant- 

 ing, axial riblets, w^hich are a little more widely spaced on the first 

 two turns than on those succeeding. On the last whorl they are 

 considerably reduced. The spiral sculpture consists of the merest 

 suggestion of obsolete threads. Suture very strongly constricted 

 with the merest indication of channeling immediately behind the 

 aperture. Periphery inflated, strongly rounded. Base short, inflated, 

 open umbilicated. and marked by the continuation of the axial riblets 

 and indications of spiral threads. Within the umbilicus, however, 

 stronger definite spiral threads are present. Aperture broadly oval, 

 almost subcircular, decidedly auriculated at the posterior angle. 

 Peristome double, the outer very broadly expanded and reflected, 

 narrower on the parietal wall than on the rest, marked by slender 

 concentric laminae. The inner slightly exserted and reflected over 

 the outer. Operculum thin, corneous, paucispiral with subcentral 

 nucleus, the outside covered with fine calcareous granules. 



The type, U.S.N.M. no. 367815, is a complete specimen, having 6.5 

 whorls and measuring: Length, 16.0 mm; greater diameter, 10.4 mm; 



