HELIX. 71 



keel, which also forms a sutural margin above ; peristome moderately 

 thickened, subreflected, the extremities connected by a thin parietal 

 callus. Diam. 22-25 mill. 



Columbia, Toulumne Co., California. 



Described as a variety of If. Mormonum, Pfr. I regard it as dis- 

 tinct. 



H. TRASKII, Newcomb. PL 15, fig. 5. 



Narrowly umbilicated, thin, translucent, dark horn colored, 

 with a superior narrow chestnut band, edged on both sides with 

 white, delicately obliquely striate, with microscopic crowded spiral 

 lines ; whorls 6, slightly convex, gradually increasing, the last some- 

 what plane above ; peristome thickened, white. Diam. 21 mill. 



Coast region of Southern California. 



H. CARPENTERI, Newcomb. PI. 15, figs. 6-8. 



Moderately umbilicated, rather thin, striate, crossed by microscopic 

 spiral lines, whitish, with a narrow, superior chestnut band ; whorls 

 "> j, convex, the last descending in front ; peristome a little expanded, 

 the extremities approaching. Diam. 23 mill. 



Cinaloa, Mexico, Lower California, Southern California. 



H. Remondi, Tryon is a synonym. The species is closely allied 

 to, perhaps a synonym of H. Traskii, New r comb. 



H. DUPETITHOUARSI, Desliayes. PL 15, fig. 9. 



Moderately umbilicated, polished, smooth, subpitted or substriate, 

 dark chestnut below, lighter above, with a chestnut, white bordered 

 band, or sometimes two; whorls 7-8, convex, the last inflated; ap- 

 erture white and banded within, peristome simple, reflected below. 



Diam. 30 mill. 



Monterey, California. 



H. Oregonensis, Lea is a synonym. 



H. SEQUOICOLA, Cooper. PL 15, fig. 10. 



Moderately umbilicated, rather thick, with somewhat rugose 

 growth striae, often decussated by coarse incised lines, upper whorls 

 with crowded granulations, and probably hirsute in fresh specimens, 

 light chestnut color, paler below, with a narrow superior chestnut 

 band, bordered with white on either margin ; peristome white, thick- 

 ened, extremities approaching. Diam. 23-27 mill. 



Near Sta. Cruz, California. 



A coast species, allied to H. Mormonum but distinguished by its 

 sculpture. 



