1916. J NATURAL SCIENCES OF PHILADELPHIA. 335 



Oreohelix peripherioa (Ancey). 



Sta. 4, "The (lift's, " one mile south of Trenton, on a small, isolated 

 mountain similar to Sta. 36. The smooth form of this species, like 

 that found at stations 26 (North Ogden) and 36 (Newton), was 

 found here. A few show the strong ribbing of the form binneyi, 

 hut the ribs are not so prominent as in the form multicostata. A 

 fiir had recently destroyed the brush and leaves so live specimens 

 were scarce, but dead shells were abundant. Two abnormal speci- 

 mens are represented on PI. XV, fig. 4. 



Sphaerium pilsbryanum Sterki. 



A few dead shells found in an irrigating ditch near Trenton, from 

 which the water had been withdrawn for some time. The species was 

 described from Bear Lake as a fossil or subfossil. Dr. Sterki writes 

 that he has one fresh specimen from Utah Lake. 



The Logan District. 



Binney recorded Thysanophora ingersoUi (Bland) under the generic 

 name Micwphysa, from Logan Canyon, collected by Hemphill 

 (2nd Suppl. Terr. Moll., p. 35). It is probably the same form that 

 Ancey, 1887, described from the same canyon as M. ingersoUi con- 

 vexior (Conch. Exch.. II. 64). We did not visit this canyon. 



Oreohelix strigosa depressa (Ckll.). 



Sta. 41, first gulch south of Logan Canyon, east of Logan, Utah, 

 in the edges of Paleozoic limestone talus. A small form of this 

 subspecies, running about 18.5 mm. in diameter, mostly strongly 

 banded, a few plain, not abundant, conditions evidently rather 

 unfavorable. A few examples strongly resemble 0. "van. albida" 

 (Hemph.), the type locality of which is "near Logan." 

 Oreohelix haydeni hybrida (Hemph.). PI. XV, fig. i. 



Patvla slrigosa var. hybrida Hemphill, Xaut., IV, 17, 1S90. 



Sta. 42, not far within the mouth of the next gulch south of Sta. 41, 

 under mountain maple and other shrubbery, herbs and rocks. The 

 snails were found in fair abundance, a few with color bands, sculpture 

 almost exactly like that of 0. h. gabbiana from stations 14 and 15, 

 but the keel is much less pronounced and often almost wanting on 

 the last whorl. This is doubtless the form that Hemphill first re- 

 corded as "the variety with microscopic ribs, beginning of haydeni, 

 among stones at the head of a gulch high on the mountains" (Binney's 

 2nd Suppl. Terr. Moll., p. 31), possibly the same gulch from which 

 we collected it. Later, in describing and naming the subspecies, he- 

 explained that it "is the beginning of the forms of strigosa that 



