98 PROCEEDINGS OF THE ACADEMY OF [March, 



on the base may be discerned in most examples. The last whorl 

 usually does not descend in front (but in some exceptional specimens 

 it descends). The typical color is cartridge-buff, with some cream- 

 buff clouding above, the early whorls being light pinkish cinnamon; 

 but it varies, some shells having a bister band below the periphery, 

 or this may be widened, suffusing much of the base (figs. 6, 6a), 

 with also a cinnamon line on the upper surface. In a few examples, 

 all of the base except within the umbilicus is between chocolate and 

 black, the upper surface being brownish. 



Alt. 9, d am. 19.4 mm. 



Limestone outcrops on Iron Creek, Station 16, some distance above 

 the confluence of Spring Creek and on Spring Creek, Station 15 

 (type loc). 



The Iron Creek specimens are nearly all of the pale typical color. 



The genitalia of a specimen from Station 15, the type locality, 

 were figured, sub nom. 0. metcalfei, in Proc. A. N. S. Phila., 1916, 

 p. 352, PI. XXII, fig. 10. Embryonic shell (PI. IX, fig. 11) as in 

 0. m. concentrica. 

 Oreohelix metcalfei acutidiscus n. subsp. PI. VIII, figs. 4, 4a. 



Broadly umbilicate, like 0. m. concentrica, from which this race 

 differs by having stronger growth-wrinkles (though much less coarse 

 than in 0. m. radiata), and in place of the spiral cords of concentrica 

 there are slightly enlarged striae, the whole base being finely striate 

 spirally between the riblets. It is mottled and clouded profusely, 

 above and below, with walnut brown. The keel is very acute. 



Alt. 10.4, diam. 22.4 mm.; 5| whorls. 



Station 23, about 1,000 feet below the summit of Sawyer Peak, 

 east of and below the camp site on the saddle, on a small outcrop of 

 limestone. 



In another place down the mountain southeast from camp, Station 

 18, we found a colony differing by being cartridge buff, a few with a 

 band below the periphery. Both of the localities are on the opposite 

 side of the mountain from the known localities of 0. m. radiata. 

 The embryonic shells are like those of radiata and concentrica. 

 Oreohelix metcalfei hermosensis n. subsp. PI. IX, figs. 4, 4o, 46. 



The shell is solid, cartridge buff with a narrow chocolate band 

 below the periphery, and some indistinct pinkish cinnamon mottling, 

 especially above. The surface is nearly smooth, having light irregular 

 growth-lines and no spiral striae. The last whorl descends in front. 

 It is strongly angular in front of the aperture, the angle becoming 

 weak on the last half. The umbilicus about as in metcalfei. 



