270 



LAND AND FRESH- WATER SHELLS OF N. A. [PART L 



Succinea oregonensis, Lea. — Shell elongated ovate, thin, of a 

 somewhat saffrou-yellovv color, rather coarsely, though obtusely and 

 distantly striated transversely ; gpire with two and a half or 

 three well-rounded whirls, separated by a distinct suture, 

 the last whirl seven-eighths the length of the shell ; aperture 

 two-thirds the length of the shell, strictly ovate, one-third 

 longer than broad ; columella arcuate, but not folded, a thin 

 white callus of considerable extent covering it. Length 6^; 

 greatest lateral diameter 3^, least 2^ mill. 



Succinea oregonensis, Lea, Proc. Am. Phil. Soc. II, 32 



(1841); Trans. IX, 5; Obs. IV, 5 (1844).— Pfeiffer, 



Mon. Hel. Viv. II, 523.— Binney, Terr. Moll. II, 77, pi. 



Ixvii, f. 2.— W. G. BisNEY, Terr. Moll. IV, 6.— Tkyon, Am. Journ. 



Conch. II, 235, pi. ii, f. 18 (1866). 



Succinea (jabbii, Tryo.v, Am. Journ. Conch. II, 234, pi. ii, f. 14 (18GG). 



Oregon and California. 



Subgenus BRACHYSPIRA, Pfr. 



Shell ovate, inflated ; spire very short, acuminate ; last whirl 

 flattened, shield-shaped ; aperture ample, angular. 



Fi2. 488. 



Succinea salleana, Pfeiffek. — Shell depressed ovate, very thin, 

 delicately striated, irregularly marked with impressed spiral lines, pel- 

 lucid, shining, whitish horn-colored ; spire very short, sub- 

 tuberculous ; whirls two and a half, the penultimate convex, 

 the last exceeding three-fourths the length of the shell ; colu- 

 mella with a slight callus, strictly receding ; aperture sub- 

 parallel to the axis, angularly oval ; peristome subthickened, 

 its right end scarcely arched. Length 19, diam. 10, height 17 

 mill ; length of aperture 1() mill., breadth below middle 9 mill. 



Succinea salleana, Pfetffer, Proc. Zool. Soc. Nov. 1849, 133; 

 Mon. Hel. Viv. Ill, IG ; in Cuemnitz, ed. 2, 49, pi. v, f. 

 7, 8.— W. G. BiNXEY, Terr. Moll. IV, 42, pi. Ixxix, f. 18. 

 — Tryon, Am. Journ. Conch. II, 240, pi. ii, f. 32 (1866). 



Near New Orleans. 



Succinea eifusa, Shuttleworth. — Shell depressed-oval, very thin, 

 transparent aud shining, lightly striated, grayish horn-colored ; spire 



