1916.] NATURAL SCIENCES OF PHILADELPHIA. 345 



The count of teeth is rather small for a Helicid genus. Mr. Binney's 

 count for "0. strigosa," 50-1-50, is so detached from other known 

 species that it needs confirmation. 



Oreohelix strigosa (Gld.). 



The anatomy of typical 0. strigosa is unknown, since we have yet 

 to rediscover the typical form. Hemphill's var. parma from Spokane 

 Falls is near the original strigosa, but it is larger and more solid. 

 Further west, at Blue Lake in the Grand Coulee, there is a small, 

 thin race, closely resembling jugalis Hemph. Nothing is known 

 of the soft anatomy of any of the subspecies or races of Washington, 

 central and "northern Idaho and Montana. 



Oreohelix strigosa depressa (CklU. PI. 19, figs. 1, 2, 3, 4, 0, 7; pi. 120, fig. 8. 



(a) Specimens from Manitou Canyon, near Colorado Springs, are 

 taken to be typical depressa (fig. 1). The penis is long, from over 

 three-fourths to more than the diameter of the shell, the internally 

 costate portion is not swollen, and is less than half the entire length — 

 usually about one-third. It has 5 or 6 ribs inside. The distal 

 portion collapses along three lines, so that its section is trefoil shaped. 

 This is due to three bands where the wall is slightly thicker. It lies 

 coiled in the body, usually showing two principal bends. The 

 general appearance in different individuals is shown in pi. 19, figures 

 1, 2 (also pi. 19, fig. 5, 0. s. fragilis.) The form cornea (pi. 19, fig. 3) 

 is identical with depressa anatomically. 



(6) In another series of specimens dissected the distal part of the 

 penis collapses along two instead of three sides, so that its section 

 becomes flattened instead of triangular. It is also less coiled or 

 twisted than in typical depressa. This form of penis is shown in pi. 

 19, figs. 4 and 7, and pi. 20, fig. 8. The last five measurements 

 in the table on page 346 belong to these. While the trefoil and 

 the flat forms are almost always readily distinguishable, yet in a 

 few specimens of the fiat type I have opened, there is some indica- 

 tion of a third ridge in part of the length (Stations 43, 46, figs. 3 and 

 6 of plate 19). 



The flat type is probably more primitive than the trefoil, since it 

 is common to this form of strigosa, peripherica and haydeni. 



O. s. depressa form tooelensis H. and D. (pi. 21, fig. 5), from Station 

 10, about 6 miles from Tooele, Utah, agrees with many specimens 

 of depressa in genitalia. The distal part of the penis is flattened. 



The radula of O. s. depressa from Colorado Springs has 16, 17, 1, 

 17, 16 teeth, the central and 5 or 6 inner laterals unicuspid. 



