36 THE NAUTILUS. 



of specimens taken as chance gave opportunity in Shasta Count} 7 , 

 still almost a virgin field for the Californian malacologist. 



Along a stream band near the highway, about two miles south 

 of Weed, occurred a number of species, the following list of 

 which furnishes strange reading for California. The proportion 

 of eastern, or, rather, boreal types is particularly noteworthy. 

 A note is made of the number of specimens taken as furnishing 

 some indication of the probable relative abundance of the species. 



Euconulus fulvus (Miiller) (alaskensis Pilsbry?), 8. 



Zonitoides arbor ea (Say), 3. 



Polita hammonis (Strom), 5. 



Polita binneyana (Morse), 2. 



Vitrina alaskana Dall, 1. 



Polygyra sierrana n. sp., 31. 



Gonyodiscus cronkhitei (Newconib), 25. 



Cochlicopa lubrica (Miiller), 4. 



Succinea avara Say, 9. 



A description of the new Polygyra is appended below. 



Polygyra sierrana new species (plate II, figs. 1-2). 



Description: Shell small, conical, thin. Growth lines 

 numerous and strong enough almost to resemble fine ribbing 

 under a lens. Embryonic whorls at first almost smooth, then 

 finely radially wrinkled, the periostracum soon showing a sys- 

 tem of dot-like papillae, bearing minute periostracal hairs over 

 most of the surface of the shell. Spire moderately low, slightly 

 convex, with impressed sutures. Whorls about 5. Body 

 whorl with a suggestion of an angle at the shoulder, and a deep, 

 abrupt constriction just back of the peristome, the base moder- 

 ately swollen; slightly decending in front. Lip light brown, 

 thickened and reflected, but not very wide; narrowed below the 

 pillar, then very slightly flaring again. Umbilicus small but 

 distinct; contained about eleven to fourteen times in the diam- 

 eter of the shell. Lip sometimes with a slight extra thickening 

 at base, otherwise without evidence of teeth, although a small, 

 whitish, narrowly crescentic parietal tooth is sometimes de- 

 veloped. Color close to Verona brown of Ridgway's nomen- 

 clature. 



