268 



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



Lingual membrane with 50 rows of (30 — 1 — 30) teeth ; centrals 

 obtusely tricuspid ; laterals bicuspid ; uncini tridentate, the inner 

 tooth much the largest. 



Succinea liairkinsii, BAinn.— Shell elongate-obovate, thin, pel- 

 lucid, shining, undulately striated, pinkish, within pearly; spire acute; 

 whirls four, convex, the last equalling two-thirds 

 Fig. 481. the shell's length ; suture impressed ; aperture 



oval, effuse below. Length f, lat. ^ inch. 

 Hub. Lake Osoyoos, British Columliia. (Brit.Mus.) 

 Tills shall is of'an elegant form, and of a pinkish 

 color, with the interior of a pearly lustre. It is 

 smooth and shining, but marked with waved strire 

 of lines of growth. It resembles very much in 

 Succinea hawUnsil. figure the Succinea pfeifferi of Europe, but is of a 



still more elegant shape, and of a brighter hue. 

 I have named it after Lieut. Col. Hawkins, R. E., Commissioner of the 

 British North American Boundary Commission. {Baird.) 



Succinea hawkinsii, Baikd, Proc. Zool. Soc. 1863, 68. — Bland, Ann. N. Y. 

 Lye. VIII, 168, f." 16 (1865).— Tryon, Am. Journ. Conch. II, 240, pi. 

 ii, f. 31 (1866). 



Fig. 481 is copied from a tracing of Baird's forthcoming plate, 

 kindly furnished me by Mr. Carpenter. 



Cat. No. 'No. of Sp. 



Localitv. 



From whom received. 



9321 



E. of Ft. Colville, W. T. , N. \V. Bound. Surv. 



Fig. 482. 



Succinea Cingulata, Forbes. — Shell oblong-ovate, scarcely ob- 

 lique, rather solid, striated, shining, tawny-amber colored, 

 often with white spiral lines ; spire drawn out, obtuse ; whirls 

 four, rather convex, the last equalling two-thirds the shell's 

 length ; aperture elongate-ovate, acute above, obliquely re- 

 ceding behind the axis at the base ; columella arched. 

 Length 12, breadth 6 mill. ; of aperture 7 long, 3 broad at 

 middle. 



Succinea cinrjulata, Forbes, Proc. Zool. Soc. 1850, 56, pi. ix, 

 f. 8.— Pfeifff.r, Mon. Hel. Viv. Ill, 17; IV, 815.— 

 Tbyon, Am. Journ. Conch. II, 241, pi. ii, f. 35 (1SG6). 



Mazatlan. 



