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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 85 



The type, U.S.N.M. no. 4G8847, lias 4.3 whorls remaining and meas- 

 ures: Length, 21.7 mm; greater diameter, 18.8 mm; lesser diameter, 

 14.2 mm. It comes from the Sierra Martillo. 



The brilliant red axial zone behind the peristome and darker 

 coloration will readily distinguish this from G. (C.) saccharinum 

 saccharlnum. 



Figure 78. — Distribution of the subspecies of Chondropometes (Chondrothyroma) 

 saccharinum: (1) saccharinum ; (2) rubicollum. 



CHONDROPOMETES (CHONDROTHYROMA) SACCHARINUM SACCHARINUM, new 



subspecies 



Plate 13, Figure 3 



This race, which comes from Pan de Azucar, is readily distin- 

 guished from C. (C.) saccharinian ruhicollum by its paler color and 

 white peristome and by the absence of the brilliant-red axial zone 

 behind the peristome. 



The type, U.S.N.M, no. 355024, which was collected on the Tomas 

 Barrera Expedition, has 4 whorls remaining and measures: Length, 

 ]9.2 mm; greater diameter, 17.0 mm; lesser diameter, 12.7 mm. 



CHONDROPOMETES (CHONDROTHYROMA) SEGREGATUM, new species 



Shell of small or medium size, white, straw-color, pale buff, or 

 sometimes faintly reddish, usually marked by interrupted spiral 

 bands, which vary much in size and intensity of color and are 

 present on both spire and base. Peristome pale yellowish or white. 



