CUBAISr SUBFAMILY CHONDKOPOMINAE — TORRE AND BARTSCH 395 

 Genus CHONDROTHYRIUM Henderson and Bartsch 



1920. Chondrothyrium Henderson and Baktsch, Proc. U. S. Nat. Mus., vol. 58, 

 p. 63. 



Shell of ovate-conic form, marked by axial and spiral threads; 

 breathing pore present in the parietal wall, comiected with the outer 

 edge of the peristome by a slit. Operculum typically chrondropo- 

 moid. 



Type : CycJosfoma violaceum Pfeiffer, 



KEY TO THE SPECIES OF GENUS CHONDROTHYRIUM 



Outer lip of outer peristome crenulated crenimargo 



Outer lip of outer peristome not crenulated violaceum 



CHONDROTHYRIUM CRENIMARGO (Pfeiffer) 



Plate 28, Figure 16 

 1858. Ci/clostoma crenUnorgo Pfeiffer, Malakozool. Blatter, vol. 5, p. 192. 



Decollated shell elongate-ovate, flesh-color, with five inteiTupted 

 narrow spiral lines of brown. Nuclear whorls decollated. Postnu- 

 clear whorls well rounded, almost appressed at the summit, marked 

 by slender, sublamellose, wavy, retractively slanting axial riblets, 

 which are a little more distantly spaced on the first of the remaining 

 turns than on those that follow. These riblets extend prominently 

 to the summit, which they render slightly crenulated. In addition 

 to the axial riblets, the whorls are marked by spiral threads, of 

 which 5 occur on the first of the remaining turns, 10 upon the second, 

 and 13 upon the last between the summit and the suture. The inter- 

 sections of the axial riblets and the spiral threads form slender oval 

 nodules, the long axis of which coincides with the axial sculpture. 

 Suture moderately constricted. Periphery well rounded, slightly in- 

 flated. Base short, somewhat inflated and rounded, narrowly openly 

 umbilicated, marked by the continuations of the axial riblets, which 

 extend into the umbilicus and also by the continuation of a similar 

 type of spiral sculpture as that found on the spire. This grows 

 a little stronger toward the umbilicus but again weakens within the 

 umbilicus. There are eight of these spiral cords between the periph- 

 ery and the outer termination of the umbilicus, then four equally 

 strong between the outer termination of the umbilicus, and the inner 

 straight side of the umbilicus, and about nine on the umbilical wall 

 which are much weaker. On the base, too, we find seven lines of 

 brownish dots coinciding with the spiral sculpture. Aperture oval, 

 posterior angle obtuse; peristome double, the inner thickened and 

 somewhat reflected, and decidedly projecting above the outer on the 

 outer lip; the outer much broader and rendered decidedly wavy 



