THE NAUTILUS. 13 



the La Sal range, so convenient to Montecello, a stage running 

 to the La Sal P. 0. at the foot of the range. Then, too, there 

 was the Carrizo range a short distance from where we crossed 

 the San Juan at Ship Rock, but duty called us away from this 

 new and prosperous agricultural section. (This is thrown in 

 because the Dean had just harvested over 3,000 bushels of wheat 

 from less than seventy acres of sage-brush land. ) 



September 13th the party again divided, Ferriss to Joliet and 

 the Dean for Tucson, taking with him a couple of young 

 Wetherills to the University, adding with his machine that 

 much to our desert journey. The girls did their part like men, 

 there was no sickness, no accidents, no great adventures and it 

 was the most enjoyable picnic ever in the most country per acre 

 ever. 



Concerning the little ones: Pupilla syngenes Pils. and syngen.es 

 dextroversa P. & F. seek the well-drained hillsides where grass 

 roots and spawls of stone lying upon the soil furnish shelter. 

 So far they have not been gathered in deep forest conditions 

 where pupas mostly congregate. The first of these was found 

 alive in the grassy hummocks under the dry cliffs of the Black 

 Mesa at Marsh Pass and again at Kayenta. 



The other was associated with Oreohelix y. clutei in the rose 

 bushes and grass at Red Rock Spring on the south slope of 

 Navajo Mountain. 



Gastrocopta pellucida hordeacella (Pils.), Pupoides hordaceus 

 (Gabb) and Gastrocopta cristata (Pils. and Van.), of the plains, 

 are seldom found alive. When dead shells appear in the ant- 

 hills a little patience and some time may obtain a few live ones 

 in the grass, chips of wood or surface stone in that vicinity. 

 The great harvest of these (dead) has been found in the drift of 

 streams draining the plains. 



Thysanophora horni at Brownsville, Texas, is at home in leaf 

 mold of the mesquit thickets, and has colors and bristles. In 

 Arizona it is found under conditions so dry no other snail ex- 

 cept Succinea avara will keep it company, but it thrives and is 

 found in large numbers with the Chtsnaxis pupas in rock piles 

 shaded by cliffs. 



The Thysanophora ingersolli group keep company with the 



