1906.] NATURAL SCIENCES OF PHILADELPHIA. 153 



seem to be referable to this race. In the Northwest another form 

 of the species, Z. milium pugetensis Dall, replaces the typical milium. 

 Neither of the subspecies differs much from milium, but what differ- 

 entiation there is seems to be correlated with geographic range. 



This species was erroneously placed in Zonitoides in the Classified 

 Catalogue of 1898. We are now convinced that it belongs, as Morse 

 demonstrated, to the subgenus Striatura of Vitrea. 



Vitrina alaskana l>all. 



V. pfeifferi Newc, Proc. Cal. Acad., II, p. 92, 1861 ; not of Deshayes, 1852. 

 Vitrina alaskana Dall, Land and Fresh-Water Mollusca of Alaska and Ad- 

 joining Regions, Harriman Alaska Exped., XIII, p. 37. 



Arizona: Huachuca mountains (Ferriss), numerous rather small 

 specimens, the only ones we have seen from Arizona. It seems to be a 

 common species of the Canadian and Transition zones eastward, speci- 

 mens being before us from the following places in New Mexico : Chi- 

 corico canyon near Raton (Cockerell); Las Huastus canyon, Sandia 

 mountains, near Albuquerque (Miss Maud Ellis) ; near Las Vegas (Miss 

 Mary Cooper) ; White Oaks and Gilmore's Ranch, Sierra Blanca (Ash- 

 mun); Fort Wingate (Dr. E. Palmer); James canyon, Cloudcroft, 

 Sacramento mountains (H. L. Viereck). 



The tyipe locality of V. alaskana is Carson valley, Nevada; but it 

 has a wide range, from Alaska to the Mexican boundary and probably 

 beyond, southward occurring only at high elevations. 

 Euconulus fulvus (Miill.). 



Drift of Pecos river, Pecos, New Mexico (Cockerell). Cave creek 

 canyon, Cochise county, Arizona (Ferriss). 



Euoonulus chersinus trochulus (Reinh.). 

 Nautilus, XII, p. 116. 

 Texas: Sinking Spring, San Marcos, Hays county; New Braunfels 

 and vicinity, Comal county; Hondo river, north of Hondo, Medina 

 county; Rio San Filipe near Del Rio, and Devil's river, Val Verde 

 county; ever3rwhere in drift debris. 



BNDODONTID^. 

 Pyramidula cronkhitei anthonyi Pilsbry. n. n. 



Helix striatella Anthony, Boston Journ. of Nat. Hist., Ill, p. 278, pi. 3, fig. 2' 

 1840. Not Helix striatella Rang, 1831. 



This shell, well known under the preoccupied name H. striatella 

 Anth., has typically a rounded periphery and moderately developed 

 oblique and sigmoid rib-strise, 4 or 5 in the space of a mm. on the 

 front of the last whorl at the periphery. There are 3^ to 3f whorls. 



