THE NAUTILUS. 135 



While telling "snake stories" I will tell them all. In our col- 

 lections of 1910 in the Santa Rita Mountains, Arizona (Pilsbry, 

 Daniels and Ferriss), we found a thin and small Sonorella belonging 

 apparently to a new group, near S. rowelli (Newc.), Again we 

 found a member of the same group in the Santa Catalinas, and last 

 year I extended it into the Grahams and Peloncillos. The habitat 

 and habits of Sonorella are usually dry, but these were wet, with a 

 fondness for deep woods and old logs. It was found easily in the 

 dark gulches of the Catalinas last summer, and in its vicinity a 

 bitter odor was noticed, something like that given out by Parnassus 

 grass, skunk cabbage, and a Tennessee goldenrod. It came from 

 the snail. As I picked it from its resting place it shot out a drop 

 or two of juice into the air, but that was the extent of the disturb- 

 ance. The odor soon disappeared and was not repeated. Of the 

 hundreds found of this odorous group I saw only three shells broken 

 by the chipmunks, and very seldom a dead one. Last summer I 

 gathered over 300 Sonorellas of the rinconensis group in one slide of 

 rock, and found only two alive. Often mice and chipmunks defeated 

 me entirely in slides containing both Oreohelix and Sonorella. 



Robert Camp, a student and collector of birds, now at Browns- 

 ville, Texas, has found more delight in snail collecting than in truck 

 gardening, and is now sending out some of the finest Texans pro- 

 duced. That region is peculiarly adapted for good colors and good 

 health in snails. His Euglandina texasiana Pfr. (not singleyana 

 W. G. B.) are perfect as perfect can be, for I was down there in 

 January and helped him catch 'em. 



He sent me in Arizona last summer some Planorbis cultratus Orb. 

 and Segmentina obstructa (Morel) he had found in the dry Texas 

 soil from four to six inches deep. Turned loose in a cup of Arizona 

 water they were soon crawling about. In January we collected in a 

 cotton field that had been cultivated four years, and on the edge of 

 the field in the shade arid unbroken ground found the shell alive four 

 inches down in stiff black soil, cracked so long that the cracks were 

 lined with moss. The live shells however were not in the cracks but 

 in the sections of black and baked soil. In a low spot of the field, 

 a springy place, we found them also with a Succinea, Physa and Pla~ 

 norbis liebmanni, Dkr., but none were alive. The latter resembles 

 the Segmentina except in wanting teeth. It is also larger. The P. 

 cultratus is thin as a sheet of ledger paper and very delicate in ap- 

 pearance. 



