1918. 



NATURAL SCIENCES OF PHILADELPHIA. 



321 



in Gosper's pasture, Station 58 (pi. VII, fig. 1) antl farther north- 

 ward in the southern part of Apache Co., on Mt. Thomas, White 

 Mountains, at Station 75 (1913). In all of these stations there are 

 the same capacious whorls and frequently very high spire noted in 

 the Mogollons. 



All of the preceding inhabit high elevations, and all were found 

 under logs and leaves in heavy timber, as in the Black Range of New 

 Mexico. The following lots were all among rocks (pi. VH, figs. 2-56). 



Farther down the Blue River (in Greenlee Co., Arizona), the species 

 was found as far as Station 23, east side of the river 2 miles above 

 the mouth of Grant Creek (pi. YII, figs. 5-56). While there is 

 abundant intergradation with the shells of higher elevations just 

 noticed, the majority of the shells are more openh' umbilicate. 

 Many have the spire very high, but this is variable in all the lots. 

 Three examples from Station 23 figured measure: 



Alt. 16, diam. 26.5 mm., umbilicus 4.7 mm. 

 . " 18, " 24 " " 4.5 " 



^" 17.8 " 23 " " 3 



The shells from Station 25 are almost as large; those from Stations 

 26 to 32 (going up the river) are smaller. Specimens from Station 

 29, 1 mile above Blue River Ranger Station (pi. VH, figs. 2-26) 

 measure : 



Alt. 17, diam. 22.3 mm. 

 " 18 " 22.2 " 

 " 15 '' 22 

 " 15.6, " 18 " 



Fig. 13. Orcohelix cooperi, albino, Station 29. 



There are some beautiful albino specimens in this lot (fig. 13). 

 Other examples are figured (pi. VII, figs. 3, 3a) from Station 27, 

 near the Blue River Ranger Station, where the shells are very dark 

 colored. One measures, alt. 13, diam. 20.5, umbilicus 5 mm. 



A series from Station 36, Mt. Lisa, Lisa Creek, Socorro Co., 

 N. ]\I., 20 miles north of Alma, is similar to those of Station 29, also 

 with not a few albino shells. 



