OF CONCHOLOGY. 225 



of occurring in a more northern locality, inhabits a more south- 

 ern and drier region than its smooth prototype*. In both cases, 

 however, the hirsute form is connected with a warmer climate. 

 Like fidelis this species is usually paler above than beneath. 



H. Columbiana* and germana are common on the west and 

 north side of the bay, the former especially. 



Triodopsis loricata, Gould, begins to appear about S. F. and 

 occurs also across the bay at Oakland as well as on the northern 

 shores, and as far along the coast as Klamath Co., 250 miles, 

 (Voy). Mr. Rowell also found it well developed near Placer- 

 ville, El Dorado Co., about 2500 ft. above the sea, and the Ex- 

 ploring Expedition give its locality as " Sacramento River," but 

 whether at its outlet in this bay or near its source in lat. 41° is 

 unknown. The largest are those from Klamath Co. Mac. 

 sportella, Gld., has I believe been recently obtained at Saucelito, 

 on the northern shore of the bay. Thus 19 out of the 44 Heli- 

 coids found within the State inhabit this district. 



These species complete the list of peculiarly Californian species 

 of the coast ranges, and as I have already given their limits 

 toward the north, I now pass to the Sierra Nevada, where a few 

 species more are found. I have already mentioned H. tudicu- 

 lata as the most widely distributed, but confined to that range, 

 and also the occurrence there of Hyalina Breweri, Conulus 

 chersina, and Triodopsis loricata. 



Vitrina Pfeifferi, Newc, occurs on the east slope of the Sierras 

 from Owen's Valley, near lat. 37° (Dr. Horn), north to Carson 

 Valley, where it was discovered in lat. 39°. It was also found 

 by Voy in Shasta Valley, Siskiyou Co., near lat. 42°, altitude 

 4000 feet. Specimens from Unalaska (Harford), are, however, 

 diiferent, and were referred by Middendorf to the European 

 pellucida. 



I collected this shell alive, with H. Breweri, Conulus chersina, 

 Patula Whitneyi, Succinea (Stretchiana, Bid. ?) and Vertigo 

 (corpulenta, Morse ?) the two last having been lost before deter- 

 mination), all together on a small swampy or springy slope in the 

 pine forest, a mile south of Lake Taho, in Sept., 1863. Tl\e first 

 four were quite numerous living and actively crawling among de- 

 caying branches of alders, etc., which covered the ground. The 

 elevation was about 6200 feet, that of the lake being 6083- Though 

 I searched carefully at various other favorable points at the lake, 

 the summit of the mountains (8000 ft.), and on the western slope, 

 I found none of them elsewhere except H. Breweri, which occurs 



* H. Columbiana is very common in the woods about Pilarcitos 

 Creek, 20 miles south of San Francisco. W. II. G. 



