354 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



turns but hardly so on the last. Suture narrowly but deeply chan- 

 neled. Periphery of the last whorl strongly inflated, well rounded. 

 Base short, inflated, well rounded, openly umbilicated, marked by 

 the continuations of the axial riblets and spiral threads equaling 

 those on the spire in strength. Those within the umbilicus are a 

 trifle weaker and a little more closely spaced than those on the out- 

 side. Last whorl not solute, or only a trifle so. Aperture broadly 

 oval ; peristome double at the posterior angle ; there is also a faint 

 indication of an outer peristome on the inner lip; on the outer and 

 basal lip the peristome seems simple. Operculum thin, corneous, 

 paucispiral, with submarginal nucleus, the outside covered with a 

 thin deposit of fine calcareous granules. 



Three specimens before us come from Palma Sola, Matanzas 

 Province. 



The specimen described and figured, U.S.N.M. no. 493185, has a 

 little more than 4 whorls and measures: Length, 15.3 mm; greater 

 diameter, 10.6 mm ; lesser diameter, 9.0 mm. 



CHONDROPOMA (CHONDROPOMA) JAULENSE. new species 



Plate 30, Figure 11 



Shell elongate-conic, varying from horn-color to pale brown, the 

 early whorls usually much darker than the later turns. The latter 

 are usually marked by axial zones of brown, which are somewhat 

 wavy and suggest confluent elements of interrupted spiral bands. 

 Nuclear whorls unknown. Tlie postnuclear whorls are well rounded 

 and marked by rather closely spaced spiral cords, which are almost 

 as broad as the spaces that separate them, and feeble axial riblets, the 

 latter most conspicuous at the summit, which they mark as fine white 

 denticles. Suture moderately constricted; periphery well rounded. 

 Base rather long, well rounded, and marked like the spire, openly 

 umbilicated. The sculpture on the umbilical wall is a little less 

 strong than on the rest of the base. The last whorl is slightly solute. 

 Peristome simple on the outer lip, with a mere line of separation on 

 the parietal wall and double on the inner lip. 



This species was collected by Wright at Punta de Jaula. 



The type, U.S.N.M. no. 499617, has 4 whorls remaining and meas- 

 ures : Lengths, 15.8 mm ; greater diameter, 9.0 mm ; lesser diameter, 

 7.5 mm. 



CHONDROPOMA (CHONDROPOMA) ANTONENSE, new species 



Plate 31, Figure 10 



Shell elongate-ovate, stout, nuclear whorls decollated in all our 

 specimens. The truncated end dark chestnut-brown, the succeeding 



