HISPANIOLAN AND BAHAMAN ANNULARIIDAE 207 



slightly auriculated. Peristome moderately thin, apparently simple, al- 

 though there is a slight indication toward doubling at the posterior angle. 

 Operculum typically chondropomoid. 



This species ranges over Great and Little Ragged Islands of the 

 Ragged Island group. 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMA) PANNOSUM 



Axial riblets very closely spaced pannosum 



Axial riblets less closely spaced panniculum 



CHONDBOPOMA (CHONDBOPOMA) PANNOSUM PANNOSUM, new sabspecies 



Plate 34, Figure 2 



This race comes from Great Ragged Island. Its fine, closely spaced, 

 axial riblets and more slender form will distinguish it from its neighbor 

 Chondropoma (Chondropoma) pannosum panniculum. 



The type (U.S.N.M. No. 469132) has 3.3 whorls remaining and 

 measures : Length, 14.3 mm. ; greater diameter, 8.3 mm. ; lesser diameter, 

 7.0 mm. It was collected by the author. 



U.S.N.M. No. 391513 contains 171 topotypes from the same source. 



U.S.N.M. No. 390317 contains 15 specimens collected by Bartsch at 

 the beach about Salt Pond on Great Ragged Island. 



CHONDBOPOMA (CHONDBOPOMA) PANNOSUM PANNICULUM, new subspecies 



Plate 34, Figure 1 



This race comes from Little Ragged Island. It differs from Chondro- 

 poma (Chondropoma) pannosum pannosum in being stouter and in hav- 

 ing the axial ribs more distantly spaced. 



The type (U.S.N.M. No. 469133), collected by Bartsch, has 3.4 whorls 

 remaining and measures : Length, 14.9 mm. ; greater diameter, 9.9 mm. ; 

 lesser diameter, 7.4 mm. 



U.S.N.M. No. 361 199 contains 12 topotypes from the same source. 



CHONDBOPOMA (CHONDBOPOMA) NECOPIUM, new species 



Shell of medium size, pale horn-colored, with interrupted spiral bands 

 of brown. These bands are arranged also in axial series and are rather 

 emphasized as vertical zones than spiral elements. Nuclear whorls 2, 

 inflated, strongly rounded, minutely granulose. The first postnuclear 

 whorl is marked by closely spaced, hairlike, retractively slanting axial 

 riblets, while the succeeding turns show gradually developed postnuclear 

 sculpture. The postnuclear whorls are decidedly inflated in Chondro- 

 poma (Chondropoma) necopium auspicatum and less so in C. (C.) 

 necopium necopium, marked by low rounded spiral threads, which are 

 only very feebly affected by the axial lines of growth, to which the axial 

 sculpture is reduced on the last whorl. On the earlier whorls the axial 

 threads are a little stronger. The summit of the turns has faint whitish 

 nodules. Suture narrowly channeled on almost all the turns. Periphery 

 strongly inflated and well rounded. Base rather broadly umbilicated, 



