HISPANIOLAN AND BAHAMAN ANNULARIIDAE 69 



slightly channeled. Periphery of the last whorl decidedly inflated, 

 strongly rounded. The base is short, strongly inflated, and strongly 

 rounded and marked by the continuation of the axial riblets and spiral 

 threads, which here are a little more distantly spaced than those on the 

 spire; they are Hkewise stronger. This type of sculpture extends into the 

 rather open umbilicus where the spiral sculpture becomes the prominent 

 element. The last whorl is solute for about one-tenth of a turn. Aper- 

 ture obliquely ovate. The peristome is simple, slightly expanded at the 

 edge. The operculum is unknown. 



The type (U.S.N.M. No. 471951), collected by Dr. W. L. Abbott on 

 Catalina Island, Dominican Republic, has 4.3 whorls remaining and 

 measures: Length, 13 mm.; greater diameter, 7.5 mm.; lesser diameter, 

 6.2 mm. 



U.S.N.M. No. 471952 contains 22 topotypes from the same source. 



The inflated, extremely rounded whorls will distinguish this from the 

 other smooth-lipped Chondropomas. 



CHONDBOPOMA (CHONDBOPOMA) CATAI.INENSE, new species 



Plate 12, Figure 2 



Shell elongate-ovate, pale buff, with a zone of brown in the suture of 

 the early turns ; the later turns are marked by interrupted spiral bands 

 of brown, which vary considerably in width and spacing. Nuclear whorls 

 2.2, well rounded, smooth, forming a rather slender apex. The post- 

 nuclear whorls are inflated, well rounded, almost appressed at the sum- 

 mit, and marked by slender, irregularly spaced and developed, sinuous, 

 retractively slanting, sublamellar axial riblets. In addition to this, the 

 whorls are marked by feeble, low, rounded, poorly indicated spiral 

 threads, which are separated by mere impressed lines and which render 

 the axial riblets wavy. The axial riblets extend prominently to the sum- 

 mit, which they denticulate. Suture oval and narrowly channeled. Pe- 

 riphery inflated, well rounded. The base is short, inflated, well rounded, 

 moderately broadly umbilicated, and marked like the spire, but here, as 

 well as in the umbilicus, the spiral threads increase in strength. The 

 last whorl is solute for about one-sixth of a turn, with a decided keel 

 at the posterior angle behind the peristome. Aperture oblique, ovate; 

 peristome simple. The operculum is unknown. 



The type (U.S.N.M. No. 471953) and 56 topotypes (U.S.N.M. No. 

 425513) were collected by Dr. W. L. Abbott on Catalina Island, 

 Dominican Republic. The type has 3.5 whorls remaining and measures : 

 Length, 12.3 mm.; greater diameter, 7 mm.; lesser diameter, 6.1 mm. 



This species is related to Chondropoma (Chondropoma) solum but 

 can readily be distinguished from this by its shorter form and less 

 rounded whorls. 



