PACIFIC COAST SPECIES. 



121 



but little is known. A. Ghieshreghti (see Moll. Mex. et Gnat.) hns very 

 dissimilar teetb, especially the marginals. A. semidausa (Malk. Bliitt., 

 XY, Plate IV, Fig. 4) also differs in its dentition. The jaws of these 

 species agree with those of infumata and fidelis. 



A. fidelis. 



Ag:laia fidelis, Gray. 



Shell umbilicated, orbicularly subconoid, epidermis light yellow or 

 brownish on the upper surface, with a black or 

 chestnut-colored revolving band visible on the 

 four outer whorls, the lower surface dark chest- 

 nut, sometimes uniformly black; suture dis- 

 tinct, impressed ; whorls 7, rounded, spirally 

 striate, with minute, delicate, impressed lines, 

 the strife of increase very distinct, and occa- 

 sionally with rows of tubercles running obliquely to the striae of growth, 

 bearing very distinct raised lines under the ej^idermis, quite like pros- 

 trate hairs; peristome reflected below, simple above, thickened; 

 aperture ovate, banded within ; umbilicus open, a little contracted by 

 the reflection of the peristome; base flattened-convex. Greater di- 

 ameter 34, lesser 30™'° ; height, 20°^™. 



Helix fidelis, Gray, Proc. Zool. Soc, July, 1834, 67.— Pfeiffer, Mod. Hel. Viv., i, 

 338; in Chemxitz, ed. 2, i, 321, pi. Ivii, figs. 12, 13.— Muller, Syn. Test, 

 anno 1«34 promulg., 8 (1836).— Eeeve, Con. Icon., No. 657 (1852).— W. G. 

 BiNNEY, Pac. R. R. Rep., vi, 111 (1857) ; Terr. Moll., iv, 14 ; L. & Fr.-W. Sh., 

 i, 161 (1869). 



Helix Nuttalliana, Lea, Am. Phil. Trans., vi, 88, pi. xxiii, fig. 74; Obs., 11, 88 (1839)— 

 Troschel, Arch. f. Nat., 1839, ii, 229.— Binney, Boat. Journ. Nat. His., iii, 

 369, pi. xii (1840); Terr. Moll., ii, 159, pi. xviii.— De Kay, N. Y. Moll., 46 

 (1843).— Gould, U. S. Expl. Exped. Moll., 66, fig. 38 (1852). 



Aglaja fidelis, Tryon, Am. Journ. Conch., ii, 311, 8(1866).— W. G. Binney, Terr. Moll., 

 V, 350. 



A species of the Oregonian Eegion, found from Humboldt Bay, 

 California, to Vancouver's Island, and eastward to the Cascade 

 Mountains. From Mount Shasta the specimens are fic oi. 



half as large as usually found. 



Animal: color dull ocher, slaty towards the tail; 

 coarsely granular upon the neck, but from a line 

 running from the dorsal line, where it issues from 

 the shell, to the mouth, the granules diminish, and are succeeded by 

 coarse, undulating, interrupted ridges, radiating in every direction 



A. fidelis var. minor. 



