74 HELIX. 



H. DIABLOENSIS, Cooper. PI. 16, fig. 25. 



Narrowly umbilicated, thin, roughened with incremental wrinkles 

 and with regular malleations arranged in spiral series, reddish horn 

 color, with a narrow, superior chestnut band, white-margined on 

 either side ; whorls 6, convex, the last not descending, somewhat 

 compressed on the side ; peristome thickened, white, almost simple. 



Diam. 22 mill. 



Mt. Diablo near S. Francisco, and in Colusa and Napa Go's. Cal. 



A species of the Coast Range. Mr. Binney makes this also a va- 

 riety of H. Calif orniensis, Lea. 



H. INTERCLSA, W. G. Binney. PI. 16, figs. 26, 33, 27. 



Imperforate, thick, growth lines numerous and distinct, crossed 

 by close, regular spiral lines, so deeply impressed that the surface is 

 divided into minute raised parallelograms, greyish yellow, with an 

 obsolete band ; whorls 5, slightly rounded, the last descending in 

 front ; aperture very oblique, horse-shoe shaped, peristome dirty 

 white, thickened, spread at the umbilicus, which it covers, often with 

 a basal tooth-like process near the columella ; margins of peristome 

 connected by a parietal callus. Diam. 22 mill. 



S. Clemente and Sta. Cruz Is., Cal. 



The above is the adult condition : a lighter type but connected 

 with it is the form described by Dr. Nevcomb as If. crebristriata 

 (fig. 33). In an apparently semi -fossil condition the thickening of the 

 shell is carried still further than in recent specimens. 



Var. REDIMITA, W. G. Binney. Fig. 27. 



Imperforate, thin, wrinkled, covered with minute crowded gran- 

 ulations ; whorls 6, rounded, the last descending in front, reddish 

 brown, with a chestnut band ; periphery simple, light-chestnut col- 

 ored, thickened, extremities approaching. Diam. 21 mill. 



S. Clemente Is., CaL 



It is H. Nickliniana, A. Binney in part. 



H. TUDICULATA, Binney. PI. 16, figs 28-30. 



Imperforate, or subumbilicated, olivaceous brown, with a chestnut, 

 white-margined band, visible above the suture on the spire, obliquely 

 striate and malleately punctate; whorls 5 , slightly convex, body 

 whorl large, tumidly expanding in front ; peristome whitish, thin, 

 expanded, slightly reflected below. Diam. 33 mill. 



Coast and Sierra Nevada region of California. 



