334 PROCEEDINGS OF THE ACADEMY OF [May, 



calcareous mountain northeast of Newton, due east of Sta. 37, under 

 the shrub Kunzia tridentata and weeds. We found here, on a very 

 unpromising slope, in considerable abundance, an Oreohelix which 

 appears to be identical with the smooth form of peripherica from 

 Sta. 26, in North Ogden Canyon, but the specimens average somewhat 

 smaller at Sta. 36 and more in keeping in this respect with the other 

 peripherica stations. 



Oreohelix rugosa (Hemph.). 



Patula sirigosa var. rugosa Hemphill, Xaut., IV, 16-17, 1890. Binney's 

 4th Suppl. to 5th Vol. Terr. Moll. U. S., p. 174, 1892. 

 Sta. 3, a little north of west from Clarkston, on the east slope of 

 the same mountain range as Sta. 37 and not more than two or three 

 miles distant, probably about one-third of the way up the mountain, 

 under scrub oak and sage brush. A comparison of this material 

 with 0. rugosa in Clapp's Hemphill collection shows them to be 

 identical. The shells remind one of 0. hendersoni Pilsbry, or rather 

 of the subspecies dakani Henderson, but Dr. Pilsbry's anatomical 

 examination disproves its relationship to hendersoni. It must be 

 remembered, however, that the connection between hendersoni and 

 dakani is hypothetical, and rugosa may prove to be a prior name for 

 the latter. The anatomy indicates a closer relationship to cooperi 

 than to strigosa or depressa, but the shell characters do not appear to 

 grade it into any of those forms, so it is for the present assigned to 

 specific rank. The specimens vary greatly in altitude, as is so 

 frequently the case in this genus. 



Pisidium huachucanum Pils. and Ferr. 



Found in a spring at Clarkston, Utah, associated with the next 

 species. Both identified by Dr. Sterki. 



Paludestrina longinqua (Gould). 



In a spring at Clarkston, Utah. 



On the bank of Bear River, due west of Cache Junction, we found 

 a single dead shell of Planorbis trivolvis. At Sta. 35, a brook northeast 

 of Newton, we found a Physa rather plentiful, which was tentatively 

 identified by Mr. Bryant Walker as P. distinguenda Tryon (?), but 

 Dr. Pilsbry says it "agrees very exactly with the type of Physa 

 cooperi." 



The Trenton District. 



Trenton, Utah, lies a few miles to the north of Newton and Cache 

 Junction. 



