no 



LAND AND FRESH WATER SHELLS OF N. A. [PART I. 



the periphery ; grauulated with incremental lines and equally oblique, 

 decussating furrows ; whirls five and a half, rather convex, the last ob- 

 tusely angulated ; suture deeply impressed ; aperture obliquely oblong- 

 ovate ; peritreme acute behind, white, decidedly reflected towards the 

 umbilicus ; throat reddish. Greater diam. 20, height 12 mill. 



Helix ramentosa, Gould, Proc. Bost. Soc. Nat. Hist. VI, 11 (1845) ; Terr. 

 Moll. U. S. Ill, 12.— Pfeiffer, Mou. Hel. Viv. IV, 349,— W. G. 

 BiNNEY, Terr. Moll. IV, 13. 

 Aglaja ramentosa, Tkyon, Am. Journ. Conch. II, 314, pi. v, f. 15 (18G2). 



California; Napa Co. to Santa Clara Co. {Cooper). 

 I am unacquainted with this species, which will perhaps prove 

 identical with the more recently described H. reticulata. 



Helix 

 californiensis. 



Helix calafornieBSSis, Lea. — Shell snbperforate, ventricose, snb- 

 globular, thin and transparent, shining, delicately indented and granu- 

 lated, faintly but regularly striate, of a pale yellowish 

 Fig. 295. horn-color, minutely flecked with pale spots and girded 



by a narrow brown band, paler at its edges ; spire ele- 

 vated, whirls five, convexly rounded, the last very broad, 

 vesicular ; base ventricose ; aperture subcircular, silky 

 and banded within ; the peristome slightly rellected, 

 thickened within, more everted towards its columellar 

 margin, where it is roundly reflected, nearly covering a 

 very small umbilical perforation. Greater diam. 19, 

 lesser IG ; height 15 mill. 



Helix californiensis, Lea, Trans. Am. Phil. Soc. VI, 99, pi. xxiii, f. 79 ; 

 Obs. II, 99 (1839) ; Troschel in Weigm. Arch. 1839, II, 221.— 

 BiNNEY, Terr. Moll. 11, 121, pi. vi, f 2.— W. G. Bikney, Terr. Moll. 

 IV, 13.— DeKay, N. Y. Moll. 46 (1843), not of Pfeiffer,(?) Chem- 

 nitz, Reeve. 



Helix vincta, Valenciennes, Voy. de la Venus, Moll. pi. i, f. 2, no descr. 

 — Reeve, Con. Iccn. no. 660. — Pfeiffer, Mon. Hel. Viv. Ill, 183 ; 

 IV, 269 ; in ChEmnitz, ed. 2, II, 487, t. clx, f. 2 (1854). 



Arionta californiensis, Tkyon, Am. Journ. Conch. II, 317, pi. v, f. 20 

 (1866). 



San Francisco ; San Diego, California. 



Readily distinguished by its thin, delicate shell 

 and globose form. 



Jaw arcuate, of uniform width throughout; ends 

 blunt ; anterior surface with only four distant, stout 

 ribs, crenulating cither margin. 



Fig. 296. 



