CUBAN SUBFAMILY CHONDROPOMINAE — TORRE AND BARTSCH 375 



This very widely distributed race is easily distinguished from 

 C. {€.) auberianum mayense by its larger size and weaker sculpture. 

 The unworn shells always have a shining semivarnished aspect, which 

 is absent from both C. {C.) aubenanum mayense and C. {C.) 

 dentatum. 



The specimen figured, U.S.N.M. no. 493204, is one of four collected 

 by Gundlach at Habana. It has 4 whorls remaining and measures: 

 Length, 13.2 mm ; greater diameter, 6.5 mm ; lesser diameter, 5.6 mm. 



A summary of the measurements of 100 specimens from various 

 localities yields the following data : 



Chrondropoma cisnerosi Arango was based upon a pathologic 

 specimen, the obsolete keeling of which was due to an injury. 



CHONDROPOMA (CHONDROPOMORUS) AUBERIANUM MAYENSE, new subspecies 



Plate 34, Figure 2 



This race, which comes from the north coastal region east of 

 Matanzas, is smaller than typical C. {C.) auberianum auberianum 

 and has the sculpture much stronger and lacks the semivarnished 

 aspect of that race. In strength of sculpture it resembles the Flor- 

 idian C. (O.) dentatum. Say but differs from that by having the axial 

 riblets much less crowded. 



The type, U.S.N.M. no. 134930, comes from Palma Sola east of 

 Punta de Maya, that is, between Matanzas and Cardenas. It has 4.3 

 whorls remaining and measures : Length, 10.2 mm ; greater diameter, 

 5.2 mm; lesser diameter, 4.4 mm. 



Chondrofomisca, new subgenus 



Small shells, varying from ovate to broadly ovate in outline, with 

 the spiral threads a little stronger than the axial riblets, the junc- 

 tions of the two forming sharply pointed cusps. The summit of 

 the whorls is rendered finely denticulated by the axial riblets. Per- 

 istome double, the outer only moderately expanded. 



Type: Cyclostoma {Chondropoma) rufopictum (Gundlach) 

 Pfeiffer. 



