324 



PROCEEDINGS OF THE ACADEMY OF [Nov.-DeC, 



Alt. 15, diam. 24 mm., umbilicus 4.5 mm. 



Type No. 109,184, from Station 76 (1913), Black River 2 miles 

 above Fish Creek. It was taken also at Stations 53, 60-62, 64, 66, 

 68, 69, 71, 72, 76-81, 83 of the expedition of 1913. 



On account of the form and sculpture of this large series, so unlike 

 the usual forms of cboperi, it appears best to name it. The Blue 

 River series varies from the apache type to the normal cooper i form. 

 Indeed, specimens could be selected from the Mogollon series agree- 

 ing with apache, though they are quite exceptional there. The 

 genitalia are either practically typical cooperi, as at Station 76, or 

 the costate part of the penis may be relatively a trifle longer, as at 

 Station 81 (fig. 14c). 



Oreohelix strigosa meridionalis n. subsp. PI. VII, fig. 9. 



The shell is depressed and very openly umbilicate, the last whorl 

 subangular above the aperture; otherwise resembling 0. c. apache. 

 Striation weak, subobsolete spiral lines only very faintly developed. 



Alt. 14.4, diam. 24.5 mm.; umbilicus 6 mm. wide; 5^ whorls. 



Y Salt House branch of Eagle Creek, Graham Co., Arizona; type 

 No. 109,186 A. N. S. P. Also taken on the Black River near the 

 horseshoe bend. 



By the shells alone we would hardly separate this form from 0. 

 cooperi apache; yet the genitalia were found to be like 0. s. depressa. 



The genitalia (fig. 15) agree with those of 0. s. depressa and various 

 allied forms except that the organs are longer in shells of similar 

 diameter; yet in Colorado depressa this is a rather variable character, 

 and it is somewhat affected by the conditions of preservation. The 

 penis is very long, its internally costate portion hardly one-third of 

 the entire length, having about 4 principal ribs within; the internall}^ 

 papillose portion flattened, weakly ribbed within, sometimes having a 

 trilobed section distally. Measurements of the organs in mm. follow: 



0. s. meridionalis differs from 0. 

 smoother shell. 



s. depressa by the distinctly 



