CUBAX SUBrA:\[ILY CHOXDROPOIMIXAE TORRE AND BARTSCH 347 



The type, U.S.N.M. no. 493150, has 4.5 whorls remaining and meas- 

 ures: Length, 16.7 mm; greater diameter, 9.9 mm; lesser diameter, 

 7.9 mm. 



CHONDROPOMA (CHONDROPOMA) NICOLASI JOHNSONI, new subspecies 



Platk 31, Figure 5 



This is the smallest race of this species known. The specimens 

 before us of this race were collected by Mr. Johnson and bear the 

 label "Isle of Pines" without specific locality. 



Shell white, with the merest indication in places of interrupted 

 brown spiral lirations. The sculpture is much stronger than that of 

 the other two subspecies. 



The type. U.S.N.M. no. 499612, is a complete specimen, which has 

 7.5 whorls and measures: Length, 16.5 mm; greater diameter, 8.0 mm; 

 lesser diameter, 7.4 mm. 



CHONDROPOMA (CHONDROPOMA) CARENASENSE Pilsbry and Henderson 



Shell elongate-conic, or when truncated elongate-ovate, pale 

 brown, marked by interrupted spiral bands of brown, which are ar- 

 ranged in both axial and spiral series. Peristome white. Nuclear 

 whorls almost 2, forming a somewhat truncated apex, the first smooth, 

 the last portion of the last showing indications of both axial and 

 spiral sculpture. Postnuclear whorls narrowly channeled at the sum- 

 mit, which is rendered crenulated by the strong extension of the 

 axial ribs, which are moderately distantly spaced, retractively slant- 

 ing, and well developed. The spiral sculpture consists of spiral 

 threads a trifle stronger than the axial riblets and increase in num- 

 ber with the whorls. The junctions of the axial ribs and spiral 

 threads form rounded nodules, which vary in strength with the 

 strength of the spiral threads, the latter varying according to the 

 intercalation of the newer elements. Suture narrowly channeled. 

 Periphery of the last whorl well rounded. Base well rounded, 

 slightly inflated, very narrowly umbilicate, the umbilicus almost 

 covered by the reflection of the outer peristome of the inner lip. 

 The base is marked by the continuations of the axial and spiral 

 threads, which are about as strong as those of the spire, those within 

 the umbilicus being a trifle weaker. Aperture broadly oval; peri- 

 stome conspicuously double, the outer expanded somewhat flaringly, 

 forming a conspicuous auricle at the posterior angle and adnate to 

 the preceding turn at the parietal wall; the inner projecting decidedly 

 above the outer, mostly so on the outer lip. Operculum corneous, 

 paucispiral, with submarginal nucleus, the outside covered with a thin 

 deposit of fine calcareous granules. 



