448 HELICID^. 



The general resemblance between this species and S. ovalis is 

 very great. It differs, however, in some well-marked particulars. 

 It attains a much larger size, is thicker and less fragile ; its color 

 is darker, having a somewhat smoky tinge. Its form is 

 Fig. ,09. ixmch. more robust, the breadth being proportionally 

 greater ; the whorls are much more convex and tumid, 

 being regularly inflated, while the upper portion of the 

 large whorl of S. ovalis is compressed, so that its broad- 

 est portion is somewhat below the middle. The whorls 

 s obiicita ^^'*^ ^^^^ oblique. The aperture is more oval, being nearly 

 as broadly rounded above as below. Common length, 

 three fifths of an inch ; breadth, two fifths of an inch; divergence, 

 eighty degrees to ninety degrees. 



It is more commonly found in moist places, but spreads itself 

 over rich or cultivated ground, whether lowland or upland, and 

 may be found in dry weather partially sheltered by sods, or lying 

 along by the side of stones, where it may enjcy the benefit of the 

 moisture condensed by these bodies. 



The animal is very similar to that of S. oralis, but in general the 

 markings are darker, and the marbled appearance which its viscera 

 exhibit through the transparent shell combines yellow instead of 

 whitish colors. Radiating lines of furrows also are quite conspicu- 

 ous on the posterior part of the foot. 



From Gaspe to Georgia, and from the Red River of the North to 

 Arkansas. It is also found fossil in the post-pleiocene bluffs on the 

 Mississippi River. 



It is extremely probable that this is, after all, the S. amphibia of 

 Europe. No distinct and constant difference can be pointed out 

 between them. In specimens of the foreign shell which I have 

 seen, the surface may perhaps be a little more glossy, and the shell 

 may have somewhat more of an appearance of solidity. Like 

 that shell, too, it varies considerably in the prominence of its 

 spire. 



Succinea Totteniana. 



Shell obliquely-ovate, greenish color, thin ; whorls three, convex, the last very 

 large and globose ; suture impressed ; aperture oval. 



Sitcrinm Toltcniona, L'-iA, Proc. Phil. Soc. ii. 32 (1841); Proc. Am. Phil. Soc. ix. 4 

 (1844) ; Obs. iv. 4. — Pfeiffer, Mon. Hel. Viv. ii. 526 ; iii. 15. — Gould, in Terr. 

 Moll. ii. 65, 72, pi. 67 6, fig. 2. — W. G. Binxey, Terr. Moll. iv. 35. — Mouse, 



