HELIX, 



173 



thickened, ends approaching, its columellar portion widened and retiecteil, 

 partially covering the umbilicus. Greater diam. 27, lesser 21 ; height 12 

 mill. 



Helix sequoicola, J. G. Cooper, Proc. Cal. Acad. Ill, 259 (1866). 



Af/lujc sequoicola, Tryon, Am. Jouru. Couch. Ill, IGO, pi. xi, f. 27 (1867). 



Santa Cruz Co., California. 



In form and coloring much allied to Helix nxormoniivi, but 

 readily distinguished by its peculiar sculpturing. It may be 

 hirsute when in a perfect condition. 



The shell described and figured was received from Dr. Cooper, 



Helix traskii, Newcomb. — Shell umbilicated, globosely-depres«ed, 

 very thin, translucent, dark horn-colored, with a revolving chestnut band, 

 doubly edged with white; with delicate oblique 

 striae and crowded microscopic revolving lines ; Fig. 301. 



spire hardly elevated, apex flattened ; whirls six, 

 slightly convex, gradually increasing, the last rather 

 plane above, inflated below, not falling before, banded 

 above the middle ; umbilicus moderate, conical ; 

 aperture very oblique, Innately semicircular, banded 

 within ; peristome with a white thickening, regu- 

 larly rounding, its terminations joined by a light 

 transparent callus, that of the columella widened, 

 subreflected, but not at all covering the umbilicus. 

 Greater diam. 21, lesser 16; height 9 mill. 



Helix traskii, Newcomb, Proc. Cal. Acad. Nat. Sci. Heli.v traskii. 



II, 91 (1861). 

 Aglaja traskii, Tryox, Am. Journ. Conch. II, 314, pi. v, f. 16 (1866). 



Los Angelos, California. 



The specimen figured was received from Dr. Newcomb. 

 may not be entirely mature. 



It 



Ilelix dupetitliouarsi, Deshayes. — Shell umbilicated, orbicu- 

 larly-convex, smooth or snbstriate, dark chest- 

 nut, lighter above, with a dark red, white- 

 margined band ; spire obtusely conoid ; whirls 

 seven to eight, narrow, rather convex, the last 

 inflated ; aperture ovate semilunar, white, and 

 banded witliin ; peristome simple, narrowly re- 

 flected, its columellar end arched, dilated and 

 arched above, not covering the moderate um- 

 bilicus. Greater diam. 29, lesser 25 ; height 17 

 mill. 



Helix dupfitithouarsi. 



