HISPANIOLAN AND BAHAMAN ANNULARIIDAE 



209 



find any distinct characters for the specimens. This race differs from 

 Chondroponia (Chondropoma) necopium necopimn in being stouter, in 

 having the whorls much more inflated and more strongly rounded, and 

 the nodules at the summit much weaker with the last whorl also a little 

 less solute. 



The type (U.S.N.M. No. 469140), collected by Bartsch, comes from 

 Big Iguana Cay and has 3.5 whorls remaining and measures: Length, 

 13.0 mm.; greater diameter, 8.3 mm.; lesser diameter, 6.6 mm. 



U.S.N.M. No. 391 188 contains 19 topotypes from the same source. 



U.S.N.M. No. 391553 contains 137 specimens collected by Bartsch 

 on the north end of Six Hill Cay opposite South Caicos. 



CHONDROPOMA (CHONDROPOMA) GL.ABRATUM Reeve 



Shell rather large, ovate, heavy, pale wax-yellow, marked by inter- 

 rupted spiral zones of brown whose elements are also arranged in axial 

 series and not infrequently give to the axial banding a most pronounced 

 aspect. Nuclear whorls 1.5, small, strongly rounded, minutely granulose, 

 forming a somewhat bluntish apex. The last portion of the nuclear turn 

 shows fine, retractively curved hairhnes. These increase in strength on 

 the first of the postnuclear turns, after which the typical postnuclear 

 sculpture assumes sway. The postnuclear whorls are inflated, well 

 rounded, and marked by low, slender, spiral threads, which are rendered 

 feebly crenulated by the closely spaced, retractively curved axial riblets. 

 The strength of this weak granulation varies somewhat in the different 

 races. Suture well constricted. Periphery of the last whorl inflated, 

 strongly rounded. Base short, strongly rounded, narrowly umbilicated 

 and marked by the continuation of the sculpture of the spire, but near 

 the umbilicus the spiral sculpture becomes somewhat strengthened. 

 Aperture broadly ovate, slightly auriculate at the posterior angle. Peri- 

 stome double ; the outer and inner coextensive with the outer and basal 

 lip distinguished by a mere impressed line on the parietal wall and best 

 showing their separation at the posterior angle. The parietal wall is ad- 

 nate to the preceding turn. Operculum typically chondropomoid. 



Reeve, in his Conchologia Iconica, 1863, plate 2, figure 12, describes 

 a shell and figures it and accredits it to Weinland, citing Malakozoolog- 

 ische Blatter, 1862. He gives its habitat as the Bahamas. 



In the quotation I have given under Chondropoma (Chondropoma) 

 inagnense, we find a statement by Weinland that he collected the species 

 in question on Crooked Island, but he was inclined there to consider this 

 Chondropoma semilabre (Lamarck). 



Chondropoma (Chondropoma) semil-abris (Lamarck) is a Haitian spe- 

 cies which is described and figured in the earlier part of this bulletin. It 

 is quite distinct from any of its Bahaman relatives. I am therefore ap- 

 plying the name Chondropoma (Chondropoma) glahratum Reeve to the 

 shells that occupy the rim of the atoll formed by Crooked, Fortune, 

 and Acklins Islands. 



