. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 428 TERRESTRIAL AIR-BREATHING MOLLUSKS. the lines of growth; spire acute, of 3 or more moderately convex whorls, sepa- rated by a well-impressed suture, the last whorl large and long, narrowing towards the base ; body portion of the face of the shell Fig. 306. J r moderately large; aperture ovate, three fourths the length of the shell; fold of the columella distinct. Length of axis 12\, breadth 6£ mill. Succinea rusticana, Gould, Proc. Bost. Soc. Nat. Hist., II. 187 (Dec. 1846) ; Mollusca of Expl. Exped., 28, Fig. 29


. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 428 TERRESTRIAL AIR-BREATHING MOLLUSKS. the lines of growth; spire acute, of 3 or more moderately convex whorls, sepa- rated by a well-impressed suture, the last whorl large and long, narrowing towards the base ; body portion of the face of the shell Fig. 306. J r moderately large; aperture ovate, three fourths the length of the shell; fold of the columella distinct. Length of axis 12\, breadth 6£ mill. Succinea rusticana, Gould, Proc. Bost. Soc. Nat. Hist., II. 187 (Dec. 1846) ; Mollusca of Expl. Exped., 28, Fig. 29 (1852). — Pfeiffer, Mon. Hel. Viv., II. 523. — W. G. Bin- ney, Terr. Moll., IV. 6, PL LXXIX. Fig. 14 ; L. & Sh., I. 269 (1869). — Tryon, Am. Journ. Conch., II. 263,(1866). Oregon to Tulare Valley, California; White Pine, Nevada, thus belonging to both Central and Pacific Provinces. For a figure of the animal, see p. 414 Jaw, lingual dentition, and genitalia unknown. Succinea Nuttalliana, Lea. Vol. III. PL LXVII. a, Fig. 4. Shell lanceolate-ovate, thin, and fragile, of a dull horn-color, somewhat rudely undulated by the lines of growth; composed of about 3 tumid whorls, forming a conical spire, the last whorl constituting nearly the whole shell; suture well- marked ; aperture nearly two thirds the length of the shell; ovate, broadly rounded in front, the posterior angle being also somewhat rounded by the abrupt curvature of the peristome; columella very gently curved, the region being somewhat gibbous; no fold on the columella, but in the region of the spire it is slightly sinuous. Length 13, of aperture 10 mill. Succinea Nuttalliana, Lea, Proc. Am. Phil. Soc, II. 32(1841); Trans., IX. 4 Obs., IV. 4 (1844).—Pfeiffer, Mon. Hel. Viv., II. 523. — Binnet, Terr. Moll., II. 81, PL LXVII. a, Fig. 4.—W. G. Binney, Terr. Moll., IV. 6 ; L. & Sh., I. 269 (1869). —Tryon, Am. Journ. Conch., II. 236 (1866). Oregon and California, in the Pacific Province. J


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