126 PROCEEDINGS OF THE ACADEMY OF [March, 



Braunfels, Comal county; San Antonio, Bexar county; Hondo river, 



two miles north of Hondo, Medina county; Del Rio, Val Verde county. 



Mr. Ferriss took some thin, translucent specimens, 8x10 mm., at 



Smith ville. The shell varies from 9.8 to 11.7 mm. diam. The pub- 



Fig. 1. Fig. 2. 



lished figm-es do not show that there is frequently a short lamellar 

 tooth or callous on the parietal wall near the suture, a short distance 

 within, as shown in the ^figured specimen from the Guadalupe river 

 near New Braunfels. 

 Thysanophora hornii (Gabb). 



Texas: Hondo river, near Hondo, Medina county; Rio San Filipe, 

 near Del Rio; Devil's river, west of Del Rio, and Pecos river at the 

 High Bridge, Val Verde county, all in river drift. 



New Mexico: Florida mountains, near Deming, Grant county. 



Arizona: Cochise county; Cave creek canyon in the Chiricahua 

 mountains; Fort Bowie; drift of San Pedro river at Benson, and 

 Manilla mine, at the west end of the Huachuca mountains. 



This small species is a typical Thysanophora, closely related to the 

 type of the genus. It varies but little throughout its extensive range, 

 unless it be in the cuticular lines and hairs, which are worn off of the 

 river-drift specimens. It has not before been reported in this country 

 from east of Cook's, Grant county, N. M. Our collection of 1903 

 extended its known range in the United States more than 500 miles 

 eastward, to the border of the Staked Plains in central-southern 

 Texas. Further localities in Arizona are given in Nautilus, XII, p. 99. 



In Mexico, T. hornii has been collected at Topo Chico, near Mon- 

 terey, Nuevo Leon, and at Victoria, Tamaulipas {Proc. A. N. S. Phila., 

 1903, p. 763). It is therefore one of the widely distributed species of 

 the States both north and south of the international boundary in 

 the Sonoran area. 



Polygyra auriformis (Bid.)- 



Helix auriformis Bland, Ann. Lye. Nat. Hist, of N. Y., VII, p. 37 (1858). 

 ? Helix sayii Wood, Index Testaceologicus, Suppl., p. 22, pi. 7, p. 34 n (1828) . 



Texas: Galveston (J. H. Ferriss); Calhoun county (Hubbard); 



