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PROCEEDINGS OF THE Is^ATIONAL MUSEUM 



VOL. 85 



are also approximations of some of (lie riblets at irregular intervals, 

 ■which give the shell a somewhat varicid aspect. 



The type, U.S.N.M. no. 307742. was collected by Mr. Henderson 

 on the south side of the west end of Sierra la Cumbre. It is a com- 

 plete specimen, having 6 whorls, and measures: Length, 18.0 mm; 

 greater diameter, 15.2 mm ; lesser diameter, 10.4 mm. 



Figure 80. — Distribution of the subspecies of Chondropometcs {Chondrothyroma) 

 scopulorum: (1) cumbrense ; (2) perplexum; (3) scopulorum. 



CHONDROPOMETES (CHONDROTHYROMA) SCOPULORUM SCOPULORUM, new 



subspecies 



Plate 12, Figure 11 



Shell of medium size, marked by rather closely spaced, decidedly 

 sublamellar axial ribs. Umbilical wall without spiral threads. 

 There is also no delimiting cord at the outer edge of the umbilicus. 



The type, U.S.N.M. no. 335034, was collected by ]\Ir. Henderson 

 on the third mogote west of the river and north of San Diego de los 

 Banos. It has 3.5 whorls remaining and measures : Length, 16.6 mm ; 

 greater diameter, 15.8 mm; lesser diameter, 11.8 mm. 



"We have this race from a number of mogotes from the southeast- 

 ern part of the Sierra la Guira. 



