62 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



qiiisquense in having the sculpture a httle more pronounced, in possess- 

 ing a less broadly expanded umbilicus, and in having the last whorl 

 less solute. 



The type (U.S.N. M. No. 471956) has 4.2 whorls remaining and 

 measures : Length, 14.2 mm. ; greater diameter, 8.9 mm. ; lesser diameter, 

 7 mm. 



CHONDBOPOMA (CHONDROPOMA) EYERDA3n, new species 



Shell ovate, decidedly variable in color, which ranges from flesh- 

 colored to chestnut-brown. It may be unicolor or variously banded 

 or axially streaked. Nuclear whorls a little more than 2, well rounded, 

 forming a pointed apex, smooth except for the last portion of the last 

 whorl, which shows the beginning of the postnuclear sculpture. The 

 postnuclear whorls are inflated, strongly rounded, narrowly shouldered 

 at the summit, and marked by sublamellar, retractively curved, slender 

 riblets and equally strong spiral threads, the junctions of which form 

 slender nodules whose long axis coincides with the axial sculpture. The 

 spaces separating the axial riblets are a little wider than those that 

 separate the spiral threads. The axial riblets become a little stronger 

 at the summit, which they finely crenulate. Periphery of the last whorl 

 well rounded. The base is short, inflated, strongly rounded, openly um- 

 bilicated, and marked by the continuation of the sculpture that char- 

 acterizes the spire, but slightly less strong. Within the umbilicus the 

 spiral threads become intensified and the axial riblets are reduced to al- 

 most incremental lines. The last whorl is solute for about one-tenth of 

 a turn, showing a conspicuous carina at the posterior angle behind the 

 peristome. Peristome double; the outer narrow on the inner lip and 

 broadly expanded on the basal and outer peristome, forming a moder- 

 ately conspicuous auricle at the posterior angle; the inner slightly ex- 

 serted and reflected over the outer to which it is appressed and adnate. 

 Operculum thin, paucispiral, with the nucleus halfway between sub- 

 marginal and subcentral, covered on the outside with a moderately thick 

 deposit of calcareous granules. 



This species comes from the south and east coasts of Gonave Island. 

 In form, sculpture, and size it strongly suggests Chondropoma (Chon- 

 dropoma) brownianum, from which, however, it is at once distinguished 

 by its double peristome and stronger sculpture. 



I am recognizing two subspecies: One collected on the south-central 

 coast of Gonave Island and the other from the southeastern part of 

 the island. The following key, diagnosis, and illustrations will help to 

 differentiate them : 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMA) EYBRDAMI 



Shell large and dark colored eyerdami 



Shell small and flesh-colored parishae 



