94 THE NAUTILUS. 



elevation of ten thousand feet where the snows never melt, 

 and only a half mile from the road is a real live glacier. From 

 the sudden change in scenery on the easterly side of the Sierras 

 one might fancy he was in the Swiss Alps. Mono Lake, over 

 ten miles across, with two volcanic islands in its center, is fair 

 to look upon ; but the bitter waters are so charged with alkali 

 that no living creature can exist in it. Surrounded as it is by 

 snow-capped mountains, whose melting snows pour in on all 

 sides, its waters remain absolutely mid linkable. From Lake 

 Mono one travels through sand and sage brush to the lovely 

 pine-forested shores of Lake Tahoe. Here we struck the fine 

 Lincoln Highway leading to San Francisco. We crossed sev- 

 eral times the old emigrant trail. One pictured the days of 

 the hardy pioneers of the gold rush of '49, the long trains of 

 oxen toiling up these terrible mountain trails, and contrast 

 the ease of our modern automobile transportation over good 

 roads and comparatively easy grades. 



A stop was made by a spring on the Lincoln Highway about 

 twenty-three miles east of Placerville. The Epi. mormonum var. 

 cala Pils. was found here. Under boards and sticks were 

 Polygyra columbiana, Goniobasis nigrina (the most southerly 

 locality reported) and a form of Polygyra loricata. This makes 

 the third instance on this trip where I noted land and fresh- 

 water species living side by side. On the return south from 

 San Francisco we stopped at Old Monterey to collect a few Epi. 

 californiensis in the sand-hills at Point Pinos and Epi. dupeti- 

 thouarsi at Cypress Point. The latter species seems to be get- 

 ting quite scarce owing to the attentions of the squirrels and 

 the cleaning-up of Cypress Point for picnic parties. All logs 

 and sticks carefully burned up leaves no place for Madam Snail 

 to rear her family. However, after diligent search some very 

 fine specimens of this handsome species were added to my 

 plunder. 



For convenient reference a list follows of the species found 

 on this trip. 



Epiphragmophora tudiculata cypreophila Newc. Rock piles five 

 miles west of Raymond. 



E. tudiculata tularensis Hemp. Rock slides near Vernal Falls. 



