THE NAUTILUS. Ill 



the opposite side. Our prettiest shells are pure white with a green, 

 transparent band, like Clapp's Maine find of Helix hortensis. 



Tiie Sonorellas were in small colonies and hard to dig. We did 

 not find any after leaving the north rim of tlie Grand Canyon and 

 the Kaibab-Powell Saddle. Powell and Kaibab plateaus are fairly 

 level and I have never seen anything more beautiful in timber land- 

 scapes. Powell is covered with a heavy growth of large yellow pine. 

 , In the Kaibab plateau or mountains, better known in Arizona as 

 Buckskin Mountains, blue spruce and quaking aspen with the pine 

 lend variety to the scenery. No landscape artist in Fairmount Park 

 could manage the grouping better than we saw it in a day and a half 

 j6urn(!y by donkey, down the Snake Gulch (known as Shinamo 

 Canyon on the U. S. maps.) 



We camped with E. W. Nelson and C. Birdsi of the biological 

 survey of the U. S. Agricultural Department at Mt. Trumbull. Here 

 we learned that the tufted-eared squirrel of the Kaibabs was 

 Sciurus alberti var. kaihahensis. It is the largest American squirrel, 

 black as silk with a white tail. A chattering chickaree is black 

 throughout, and there are four chipmunks and a blue grouse. Deer 

 were about as common as cattle, and as tame, for the Kaibabs are in 

 a game preserve. The plains about Trumbull are populated with 

 wild horses and these are common game, to be had for the catching. 



Again I visited the Grotto [on White Creek, a branch of the 

 Grand Canyon] and took more of the maidenhair fern. It seems to 

 be a new species, and it so happens I am working at that group. 

 The Grotto and creek have been filling up with gravel since you and 

 I were there togethei-. They are quite changed since our visit three 

 years ago. From the Grotto, Wiiite creek keeps to the north and 

 Muav to the west ; heading in the saddle between Kaibab and Powell 

 plateaus. So when you and I slept by the fire and found the colony 

 of Sonorellas we were in the Muav Wash and more than half way 

 to the north rim of the Grand Canyon. About a mile above our 

 sleeping place, there is a fine trout stream (without fish) and cliffs 

 a thousand feet high, with Sonorellas. 



There were no mice this time at our old thousand-mouse camp on 

 Shinamo creek.* We saw but two on the whole trip. Thus John 

 had a fine orchard with leaves on the trees this time, also melons, 

 sweet potatoes and common things in plenty. Their asbestos mine 



^ On the north side of the Grand Canyon, near the river. 



