HISPANIOLAN AND BAHAMAN ANNULARIIDAE 189 



T. hermudezi Torre and Bartsch from western Cuba, where it lives in 

 the axils of palm leaves. Chondrops is a ground dweller confined tn the 

 southeastern Bahamas. 



Type species: Chondropoma (Chondrops) biforme Pfeiffer. 



KEY TO THE SPECIES OP THE SUBGENUS CHONDROPS 



Axial ribs lamellar cometense 



Axial ribs not lamellar. 



Spiral sculpture forming strong keels. 



Spiral keels on last whorl 3 inaguicolum 



Spiral keels on last whorl more than 3 baconi 



Spiral sculpture not forming strong keels. 



Spiral sculpture forming strong rounded cords biforme 



Spiral sculpture feeble, not forming strong rounded cords. 



Axial ribs very fine and closely spaced planaense 



Axial ribs almost obsolete rawsoni 



CHONDROPOMA (CHONDROPS) COMETENSE, new species 



Plate 33, Figure 1 



Decollated shell pupoid, subcylindric, of pale brown ground color, 

 with axial streaks a little darker and with the ribs, particularly on the 

 later whorls, much paler. Early whorls decollated in all our specimens ; 

 the remaining turns are moderately rounded and marked by strong spiral 

 cords, of which four occur upon all the whorls between the summit and 

 the periphery, with an intercalated cord between the second and third 

 on the last two whorls in the type. The axial sculpture consists of nar- 

 row, slender, lamellar axial ribs, which are a little more distantly spaced 

 on the early turns than on the last and which render the spiral cords 

 scalloped and almost nodulose at their intersection. These ribs, of which 

 84 occur upon the last turn, extend prominently to the summit, where 

 at irregular intervals several of them become fused to form a decided 

 cusp. Suture moderately constricted. Periphery well rounded. Base mod- 

 erately long, well rounded, and narrowly umbilicated, marked by five 

 spiral cords equaling those of the spire and by the continuation of the 

 axial ribs, which also extend into the umbilicus, where there is an addi- 

 tional slender spiral cord. The last whorl is solute for about one-fifth 

 of a turn. Aperture broadly oval, slightly auriculated at the posterior 

 angle. Peristome double; the outer moderately broadly expanded and 

 reflected; the inner adnate to the outer, projecting only a trifle. Oper- 

 culum typically chondropsid. 



The type (U.S.N.M. No. 469143) was collected by Bartsch at Stubb 

 Guano Cave, Cape Comete, East Caicos. It has 4.3 whorls and measures : 

 Length, 11.3 mm.; greater diameter, 5.7 mm.; lesser diameter, 4.5 mm. 



U.S.N.M. No. 391524 contains 73 topotypes from the same source. 



This species is differentiated from the others belonging to Chondrops 

 by its lamellose axial ribs. 



