CIIOXDROPOMA. 



295 



Genus CHONDROPOMA, Pfeiffer. 



Operculum oval, sub-cartilaginous, flat, whorls few, rapidly 

 increasing ; nucleus generally very excentric. 



Shell ohlong-turreted, often truncated, rarely, globosely- 

 turbinated ; aperture oval ; peristome simple, or more or 

 less double, somewhat straight, rather expanded or broadly 

 reflexed. 



Ex. C. semilabre, Lamarck, pi. 86, fig. 11. Operculum, 

 C. semilabre, fig. 11, a, 11, b. 



Chiefly from the West-Indian Islands, Jamaica, Cuba, 

 Haiti; Honduras, Florida, and Mexico Except in the 

 operculum not being testaceous, this group does not seem 

 to differ very materially from Cistula. 



Species of Chondropoma. 



bland tun, Pfeiff. 

 crenulatum, Ferus. 



Cumanense, Pfeiff. 

 Delatreauum, D'Orb. 

 dentatum, Say. 

 diaphanum, Pfeiff. 

 elongatum, Wood. 

 eusarcum, Pfeiff. 

 harpa, Pfeiff. 

 bemiotum, Pfeiff. 

 integrum, Pfeiff. 

 irradians, Shuttl. 

 jucundum, Pfeiff. 

 latilabre, D'Orb. 

 litturatum, Pfeiff. 

 Loweanum, Pfeiff. 

 magnificum, Salle. 



Newcombianum, C. B. 



Adams. 

 obesum, Mke. 

 Ottonis, Pfeiff. 

 papyraceum, C. B. Adams. 

 Petitianum, Pfeiff. 

 pictum, Pfeiff. 

 plicatulura, Pffeiff. 

 Poeyanum, D'Orb. 

 rubicundum, Morel. 

 Salleanum, Pfeiff. 

 semicanum, Morel. 

 semilabre, Lam. 

 sericatum, Morel. 

 Shuttlewortbi, Pfeiff. 

 simplex, Pfeiff. 

 tenebrosum, Morel. 



