372 PROCEEDINGS OF THE NATIONAL MUSEUM vol.85 



The type, U.S.N.M. no. 367764, has 6.0 whorls remaining and 

 measures: Length, 16.1 mm; greater diameter, 6.8 mm; lesser diam- 

 eter, 5.5 mm. 



CHONDROPOMA (CHONDROPOMORUS) DELATREANUM (Orbigrny) 



Shell elongate-conic; all our specimens truncated; ground color 

 ranging from flesh-color to pale brown ; darker brown spiral bands are 

 present, which are usually interrupted and the elements constituting 

 them are arranged in both axial and spiral series. At times, however, 

 they are continuous, but even then tliere is more or less of an axial 

 and spiral emphasis in the color pattern. At times the outer edge of 

 the axial ribs is white, which forms, in addition to the color scheme 

 mentioned above, a blotchy appearance. The peristome is rarely ever 

 marked by strong alternating bands of dark and light; as a rule it 

 is unicolor. Postnuclear whorls moderately strongly arched, marked 

 by retractively slanting axial riblets, which are slightly sinuous and 

 which are at irregular intervals gathered into tufts or strong denticles 

 at the summit. In addition to this, spiral threads are present, which 

 are a little wider than or as wide as the axial ribs. The junctions of 

 the ribs and the spiral threads form slender nodules, while the spaces 

 enclosed between them form more or less rectangular or squarish pits. 

 Suture moderately constricted. Base moderately long, narrowly 

 openly umbiiicated, marked by the continuation of the axial ribs and 

 spiral threads, the latter a little broader and more closely spaced than 

 those on the spire. The umbilical wall is marked by rather conspicu- 

 ous spiral threads. The last whorl is solute for a small fraction of a 

 turn. Aperture oval ; peristome double, both the inner and outer mod- 

 erately expanded and reflected, tlie outer extends a little less beyond 

 the inner on the columellar wall and forms a slight auricle at the 

 posterior angle ; the inner projects considerably above the outer. Op- 

 erculum thin, with the nucleus midway between subcentral and mar- 

 ginal, covered with a fine, thin granular deposit. 



The races of this species are dibtributed through Santa Clara 

 Province. 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMORUS) DELATREANUM 



Length of decollated shell more than 13 mm santafeum 



Length of decollated shell less than 12 mm. 



Last whorl couspicuously solute bonacheum 



Last whorl not conspicuously solute delatreanum 



CHONDROPOMA (CHONDROPOMORUS) DELATREANUM SANTAFEUM, new subspecies 



Plate 33, Figure 2 



This race, which is larger than the others, comes from the region 

 about Loma de Santa Fe, Santa Clara Province. The sculpture is 



