222 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 85 



CHONDROPOMETES (CHONDROTHYROMA) CONCOLOR FONTEI, new subspecies 



Pl\te 11, Figure 4 



Shell very small, white, with a mere yellowish flush; varicial 

 streaks scarcely indicated. The umbilical wall is marked by feeble 

 spiral threads. 



The type, U.S.N.M. no. 428805, comes from the Mogote de Fonte 

 southeast of the Sierra Guacamayas. It is a complete specimen, hav- 

 ing 5.3 wliorls, and measures: Length, 12.5 mm: greater diameter, 

 11.0 mm; lesser diameter, 8.0 mm. 



This is the smallest race known of this subspecies. 



CHONDROPOMETES (CHONDROTHYROMA) CONCOLOR SPE, new subspecies 

 Plate 11, Figure 9 



This subspecies comes from the southern of the two mogotes, south- 

 east of San Andres, which are collectively known as Mogotes Fonte. 

 The second is embraced by the Finca la Esperanza and may take that 

 name. This subspecies closely resembles that from the sister mogote, 

 Fonte, C. {C.) concolor fontei, but is a trifle larger and has the axial 

 I'ibs more distantly spaced. 



The type. U.S.N.M. no. 468724. has 5.5 whorls remaining and 

 measures : Length, 15.2 mm ; greater diameter, 12.7 mm ; lesser diam- 

 eter, 8,9 mm. 



CHONDROPOMETES (CHONDROTHYROMA) CONCOLOR CARNICOLOR, new subspecies 



Plate 11, Figure 7 



This race, which is quite similar to C. {€.) concolor spe in form 

 and ribbing but is flesh-color, was collected by Natenson on the mogote 

 south of the Casa del Perez Rivera about one and one-half miles south 

 and a little east of the Sierra Guacamayas. 



The type, U.S.N.M. no. 468942, has almost 4.0 whorls remaining 

 and measures: Length, 13.7 mm; greater diameter, 11.7 mm; lesser 

 diameter, 8.6 mm. 



CHONDROPOMETES (CHONDROTHYROMA) MAGNUM, new species 



Sliell large, turbinate, with moderately broad open umbilicus, red 

 or reddish, unicolor or spirally banded. The peristome varies from 

 white to pale reddish. The operculum is white. Nuclear whorls a 

 little more than 2, coiling in perfect harmony with the rest of the 

 spire, inflated, strongly rounded; the first smooth, the next finely 

 microscopically granulose, the last showing fine, closely spaced, micro- 

 scopic incremental lines. Postnuclear whorls rather abrui)tly differen- 

 tiated from the nuclear turn, inflated, strongly rounded, marked by 



