110 THE NAUTILUS. 



Aperture wide and oblique ; parietal callus barely visible, carry- 

 ing a nearly straight parietal lamella wliich runs nearly parallel 

 with the lower edge of the aperture, and is bent inward at the outer 

 end, in shape a fair representation of a letter J reversed. 3 teeth 

 upon the outer lip well developed : a wide tooth just below the per- 

 ipheral angle, somewhat receding or set back from the lip ; a pair 

 of teeth upon the basal margin, yoked together at their outer ends, 

 and extending inward across the thickening of the peristome, in shape 

 therefore like the letter U. 



Alt. 5.7, diam. 14 mm. 



Largest shell 14.8 mm. diam. by 6.4 alt. Smallest, 13.9 diam. 

 by 6.1 alt. 



The shell in color and general appearance seems close to A. 

 walkeri Ferr., but is larger, being less depressed, and it has a nar- 

 rower umbilicus and more whorls. In sculpture and epidermal cover- 

 ing it is similar to A, lepiderma P. & F., of which the new species 

 is a sort of large edition. 



Cotypes in coll. Academy of National Sciences, Philadelphia, and 

 in my own collection. 



In a hasty search I found but eight of these, of which two were 

 alive, at the foot of a rocky slide on the east bank of the river in 

 company with Sonorella and smaller shells. 



May 7th, 1913 I left Joliet just a-crawling, for there had been no 

 vacations since 1910, and the fight for bread had been usually hard. 

 I returned home October 20th, the longest vacation I ever had ; and 

 the best of it is, the bread question is settled so that I shall not want, 

 and the vacations hereafter can be as frequent and long as I please. 



Until September, I chaperoned a party of invalids in the Santa 

 Catalina Mountains near Tucson. This chaperoning and my own 

 tired feeling prevented me from making a complete survey of that 

 range, though I had done a little of it in 1910. I brought home a 

 large quantity of dirt containing Pupas, many cans of dead Sonorel- 

 las, and the skins of five kinds of rattle-snakes, picked off of 'em here 

 and there in the hills. 



With Frank Coles, a splended guide and biscuit maker, I drove 

 across the plains and over the mountains from Tucson to Wilcox, 

 then to the Graham Mountains, Solomonville, the Peloncillo Mts., 

 and to Clifton, picking up snails, snakes, terrapins, ferns and daisies ; 

 occasionally a few peaches, melons, and our own belongings. It was 



