1917.] 



NATURAL SCIENCES OF PHILADELPHIA. 



99 



Alt. 12.3, diam. 21.4 mm.; 5| whorls. 



Stations 55 and 56, near Hermosa, Sierra County, New Mexico. 



This subspecies resembles 0. metcaljei in color and the smooth 

 surface, but differs by wanting the strong keel of the last whorl. 



Genitalia are substantially as in 0. m. radiata. The penis is 

 figured, fig. 4fl, and opened, fig. 46. The lower portion has several 

 very irregular and unequal fleshy ridges within, upper portion 

 papillose. Length of penis 13 mm., of its thickened lower part 5 mm. ; 

 length of epiphallus 3.5 mm.; of penial retractor 6 mm. Diameter 

 of the shell 20.5 mm. 



The embryonic shells (PI. IX, fig. 12) are exactly as in the forms 

 of metcaljei from the Black Range. In the adult shell the embryo 

 photographs abnormally dark on account of its yellow hue. 



Fig. 4. — Penis of Oreohelix metcaljei hennosensis. a, exferior; b, the same opened. 



Oreohelix metcalfei cuchillensis n. subsp. PI. IX, figs. l. la, 16. 



This form is smaller than hermosensis, and the peripheral angle 

 in front of the aperture is weaker, scarcely noticeable. Typically 

 there are very minute and superficial spiral striae, but on many 

 specimens these cannot be made out. The last whorl descends 

 little or not at all in front. There is about a half whorl less. 



Alt. 9, diam. 18.2 mm.; 4f whorls. 



Cuchillo Mountains, Sierra County, at two stations about two 

 miles apart, at the southern end of the range. 



We have hesitated between uniting this with 0. m. hermosensis 

 and giving it separate standing. The sizes intergrade in a small 

 number of specimens, cuchillensis varying from 15.4 to 20 mm. 

 diameter; yet where this is the case, the specimens are readily separa- 

 ble by other characters. Except for one specimen of 20 mm. diam., 

 none of the lot of over 200 specimens exceeds 19 mm. diameter. 



