374 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



lively slanting axial threads. A number of these threads are gath- 

 ered together at the summit at more or less regular intervals into 

 broad, large tufts or denticles. The spiral sculpture consists of 

 threads a little stronger than the axial but much more distantly 

 spaced. The junctions of the axial and spiral threads form feeble 

 nodules, while the spaces enclosed between them form rectangular 

 pits having their long axis parallel with the axial sculpture. Suture 

 moderately constricted. Periphery of the last whorl well rounded. 

 Base moderately long, well rounded, narrowly umbilicated, marked 

 by the continuation of the axial ribs and spiral threads, the latter 

 a trifle stronger than those on the spire. Several spiral threads are 

 present on the parietal wall within the umbilicus. Last whorl 

 slightly solute. Aperture broadly oval ; slightly angulated at the 

 posterior angle; peristome single, though in some of the specimens 

 there is the merest indication of doubling at the posterior angle. 

 This, however, may be altogether due to the denticles being well 

 developed at that place at times. Operculum thin, paucispiral, with 

 a thin, finely granular deposit on the outside. Nucleus submarginal. 



PfeifFer describes the animal as ashy gray. Eyes very distant, 

 black, placed upon the white conic antennae. Foot very short 

 posteriorly. 



This is a lowland species that ranges from Matanzas Province west 

 to Esperanza and southward to the south coast. C. {C.) auherianum 

 has been confused with C. {C.) dentatum^ which comes from the Flor- 

 ida Keys and which we consider a distinct species. 



We are recognizing two subspecies. 



KEY TO THE SUBSPECIES OF CHONDROPOMA (CHONDROPOMORUS) AUBERIANUM 



Axial and spiral sculpture prominent auberianum 



Axial and spiral sculpture not prominent mayense 



CHONDROPOMA (CHONDROPOMORUS) AUBERIANUM AUBERIANUM (Orbigny) 



Plate 34, Figures 1, 3 



1839. Cyclostoma lineolattim Anton, Verzeichniss der Conchylien, p. 54 ; not 

 Cyclostoma Uneolatum Lamarck, Histoire naturelle des animaux sans 



vert^bres, vol. 6, pt. 2, p. 147, 1822. 

 1839. Cyclostoma crentilatum Pfeiffer, Wiegmann's Archiv fiir Naturg., vol. 1, 



p. 356; not Cyclostoma crenulatum (Ferussac) Potiez and Michaud, 



Galerie des moUusques . . . Douai, vol. 1, p. 235, pi. 24, figs. 3, 4, 1838. 

 1842. Cyclostoma auberianum Orbigny, iu Sagra's Histoire physique, politique et 



naturelle de I'llc de Cuba, vol. 1, p. 260, pi. 22, figs. 12-14. 

 1850. Licina lunulatum MttixEB, in Morcb's Catalogus conchyliorum quae reli- 



quit C. P. Kierulf, p. 8. 

 1876. Chondropoma cisnerosi Abango, Ann. Real Acad. Cienc. Habana, 1876, p. 1. 



