62 proceedings of the academy of [feb., 



Smithfield, Utah. 



Sta. 101, limestone butte about two miles northeast of Smithfield. 

 Oreohelix peripherica (Ancey), almost devoid of color bands — the 

 binneyi form. A few live snails were found by persistent search, but 

 dead, bleached shells were very abundant on the slopes to the top 

 of the butte, thence to the north slope of the entrance to the canyon 

 to the southeast. The butte has been considerably denuded by 

 overgrazing, and erosion has washed the soil and dead leaves from 

 beneath the shrubs and Balsamorrhiza that formerly afforded shelter 

 for the snails. Bleached shells almost whitened the ground down 

 the slopes from clumps of bushes where now there is no snail cover 

 at all. It is difficult to see how the shrubbery can long continue to 

 exist. As this butte is only six miles south of the Oreohelix haydeni 

 corrugata butte, and the two buttes are of the same character, we 

 expected to find that subspecies here, but failed to do so. Three 

 buttes of similar character, placed at intervals of about six miles and 

 almost in line, our stations 38, 40 and 101, yielded respectively 

 0. s. fragilis, 0. h. corrugata and 0. peripherica. 



We worked up the large canyon southeast of Sta. 101 for several 

 miles, and were surprised to find no snails in it. 



The Logan, Utah, District. 



This region is covered by the Logan Quadrangle topographic sheet 

 of the United States Geological Survey, issued since our visit. 



Sta. 86, north fork of Logan Canyon, about sixteen miles from 

 Logan and three miles above " the forks. " Oreohelix strigosa depressa 

 (Ckll.) abundant under mountain maples at the edges of limestone 

 slides, where the blanket of leaves was thick, but a few large rocks 

 and roots provided clinging places for the snails. We also obtained 

 the following species: 



Thysanophora ingersolli (Bland) . Zonitoides arborea (Say) . 

 Pupilla blandi (Morse) ? one Pyramidula cronkhitei anthonyi 



broken shell. Pils. 



Vitrina alaskana Dall. Succinea avara Say. 



Euconulus fidvus alaskensis Pils. 



Thysanophora ingersolli was described by Bland^ in 1875, under 

 the name Helix ingersollii, from specimens obtained in Colorado. 

 IngersolP*^ republished the description in 1876, under the name 



9 Ann. N. Y. Lye. Nat. Hist., XI, p. 151, 1875. ^ 



10 8th Ann. Kept. (Hayden's) U. S. Geol. and Gcofr. Surv. Terr., for 1874, 

 pp. 397-398, 1876. 



