338 proceedings of the academy of [may, 



The McCammon District. 

 McCammon, Idaho, is about fifty miles northwest of Franklin. 



Oreohelix cooperi (W. G. B.). 



Sta. 1, one mile north of McCammon, Idaho, on the north side of 

 the railroad. Several additional faint, narrow color bands below 

 periphery. 



Oreohelix strigosa depressa (Ckll.). 



Sta. 2, about six miles up Harkness Canyon, directly east of 

 McCammon, below the first limestone ledge, under leaves and small 

 stones. This form is allied to depressa by its anatomy, but is on the 

 average much less depressed, the whorls more convex, and few are 

 strongly banded, though most of them show some traces of color 

 bands, and a number exhibit several faint, narrow bands below, 

 such as are so common in 0. cooperi, but not so usual in depressa. 



Oreohelix tenuistriata new species. PI. XV, figs. 5, 6. 



Shell small, rather depressed; whorls about 4^, convex, carinated; 

 transverse sculpture consists of numerous, crowded, sharp, wavy 

 lines, presenting a beautiful appearance under a lens, crossed by 

 a number of indistinct, raised, spiral lines; umbilicus open, exhibiting 

 all of the whorls; color of live shell unknown, but probably a dirty 

 white; exact measurements of adult unknown, but diameter about 

 9 mm., altitude about 5 or 5.5 mm. The paratype in Coll. Acad. 

 Nat. Sci. Phila. measures, alt. 5.1, diam. 8.5 mm. In general appear- 

 ance and sculpture it closely resembles 0. carinifera Pils., but the 

 transverse sculpture is sharper than in the two specimens of that 

 species we have been able to examine. Also the second embryonic 

 whorl is sharply striate and convex, while in carinifera and hemphilli 

 it is smooth and convex and in yavapai it is smooth and flatter. 



Type locality, Sta. lh, a canyon between McCammon and Hot 

 Lava Springs, Idaho, about two miles southwest of the latter place. 

 Only three examples were found, all more or less broken. One is 

 in The Academy of Natural Sciences of Philadelphia, one in the 

 University of Colorado, and the type in the collection of Mr. Daniels. 

 These specimens were all submitted to Dr. Pilsbry, who says they 

 represent an undescribed species and belong to the hemphilli and 

 carinifera group. With more and better material this may prove 

 to be a subspecies of one or the other, but it does not at present seem 

 probable. With it were found, sparingly, Vallpnia gracilicosta 

 Reinh., Euconulus fulvus Mull, and Vitrina alaskana Dall. 



