SUCCINEA. 



257 



Terr. Moll. Ill, 05, 66.— W. G. Binsey, Terr. Moll. IV, 37, pi. Ixxix, 

 f. 7.— Tkyon, Am. .Journ. Conch. II, 238, pi. ii, f. 25 (1866). 

 Succiiiea campestris, Anthony, Ohio Cat., no descr., part (1843), No. 95. 



Mr. Lea's original description and figure are copied above. 



Fix. 455. 



Succinea sillimani, Bland. — Shell oblong-ovate, thin, coarsely 

 striate, shining, whitish? spire short, acute; whirls 

 three, convex ; suture impressed ; aperture oblique, 

 elongate-oval, angular above, effuse at the base ; 

 columella slightly arcuate, with a thread-like 

 thickening above. Long. 20, diam. 8^ mill. ; aper- 

 ture 13 mill, long, 6 broad in middle. 



Succinca sillimani, Bland, Ann. N. Y. Lye. VIII, 

 167, f. 13 (1865).— Tkyon, Am. Journ. Conch. 

 II, 236, pi. ii, f. 21 (1866). 



Succinea sillimatii. 



Fig. 456. 



Humboldt Lake, Nevada. 



The original description and figure are given above. 



Succinea OTalis, Gould, not Say. — Shell ovate, somewhat conic, 

 very thin, pellucid, watery horn-color, sometimes tinted roseate ; periostraca 

 shining, very minutely striate ; whirls three, the last compressed and 

 elongate when viewed above ; spire short but acute ; suture 

 impressed ; aperture produced by a deep truncation of the 

 shell, elongated, more than three-fourths the length of the 

 shell, patulous, expanding anteriorly, exhibiting the interior 

 of the volutions; when viewed on the side of the aperture, 

 the conical shape of the shell appears, the broadest part of 

 the cone is below the centre of the aperture, and it tapers 

 gradually to the apex. Extreme length 15 mill., of aper- 

 ture 10. 



Succinca ovalis, Gould, Invertebrata, 194, f. 125 (1841). — 



Adams, Shells of Vermont, 270.— Binney, Terr. Moll. II, 78, pi. Ixvii, 

 a, f. 3.— W. G. BiNSEY, Terr. Moll. IV, 37.— Pfeiffer, Mon. Hel. Viv. 

 IV, 814.— Morse, Journ. Portl. Soc. I, 30, f. 77 ; pi. ix, f. 78 (1864) ; 

 Amer. Nat. I, 607, f. 48 (1868).— Tryon, Am. Journ. Couch. II, 237, 

 pi. ii, f. 22 (1866).— Not of Say. 



Succinea decampii, Tryon, Am. Journ. Conch.ll, 237, pi. ii, f. 23 (1866). 



Canada and the Northern and Middle States. 

 1 7 January, 1869. 



