CUBAN SUBFAMILY CHONDROPOMINAE TORRE AND BARTSCH 345 



fact they are a little stronger on the narrowly shouldered summit 

 than on the rest of the turn, appearing here as low lamellae. The 

 spiral sculpture consists of rather strong broad cords, which are a 

 little narrower than the spaces that separate them. There are 7 of 

 these on the first of the remaining turns between summit and suture 

 and 18 on the last immediately behind the peristome. The junctions 

 of the axial riblets and spiral cords form slender tubercles whose 

 long axis is parallel with the axial sculpture. Suture slightly 

 channeled. Peri])hery of the last whorl inflated, well rounded. 

 Base moderately long, inflated, well rounded, narrowly umbilicated, 

 marked by the continuations of the axial riblets and spiral cords, 

 the latter of about the same strength as those on the spire but a 

 little more distantly spaced near the umbilicus. The umbilical wall 

 is also marked by spiral cords, but here they are a little more closely 

 spaced and a little less strongly developed than those outside of the 

 umbilicus. Aperture broadly oval ; peristome double, the outer form- 

 ing a narrow auricle at the posterior angle, and here consists of a 

 series of concentric lamellae; on the rest of the aperture it extends 

 but slightly beyond the peristome, a little more so on the inner lip 

 than on the outer; the inner peristome is rather strongly developed, 

 thickened and slightly reflected, and but slightly exserted above the 

 inner. Operculum paucispiral, with submarginal nucleus, the out- 

 side covered with a rather thick deposit of fine calcareous granules. 

 The specimen described and figured, U.S.N.M. no. 493145, is a 

 cotype collected by John B. Henderson at Rosario, Ensenada de 

 Cochinas, on the south coast of Cuba. It has a little more than 4 

 whorls remaining and measures : Length, 19.0 mm ; greater diameter, 

 11.6 nun; lesser diameter, 9.3 mm. 



CHONDROPOMA (CHONDROPOMA) NICOLASI, new species 



Shell of medium size, the truncated specimens ovate; when com- 

 plete elongate-conic, horn-color or white, unicolor or marked with in- 

 conspicuous, interrupted spiral bands of brown. The elements com- 

 posing these bands are arranged in both axial and spiral series; 

 axially they are rather distantly spaced. Tiie peristome is almost 

 the same color as the ground color of the shell, being only a very 

 little paler. Nuclear wdiorls about 2, forming a somewhat flattened 

 apex; the first part smooth, the last showing the begimiing of the 

 postnuclear sculpture. Postnuclear whorls are strongly rounded, 

 almost inflated, and narrowly shouldered at the summit, marked by 

 slender, retractively slanting, axial, threadlike riblets, which become 

 slightly expanded into flattened crenulations at the summit. The 

 spiral sculpture consists of rather strong cords, which are not quite 

 so wide as the spaces that separate them. The junctions of the axial 



