266 



Land and fresh- water shells of n, a. [part i. 



to Arkansas. It is also found fossil in the postpleiocene bluffs 

 of the Mississippi River. 



Fig. 476. 



Succinea totteniana, Lea.— Shell obliquely-ovate, of a greenish 

 color, thin, shining, somewhat diaphanous, obsoletely striated ; 

 whirls three, convex, the last very large and globose ; spire 

 very short ; suture impressed ; aperture large, oval, oblique ; 

 peristome thin, acute. Greatest length 16 mill. 



Succinea totteniana, Lea, Proc. Phil. Soc. II, 32 (1841) ; 

 Trans. Am. Phil. Soc. IX, 4 (1844); Obs. IV, 4.— 

 Pfeiffek, Mon. Hel. Viv. II, 521; III, 15.— Gould, in 

 Terr. Moll. II, 6.5, 72, pi. Ixvii, b, f. 2.— W. G. Binney, 

 Terr. Moll. IV, 35.— Morse, Journ. Portl. Soc. I, 29, f. 

 73 ; pi. ix, f. 74 (1864) ; Amer. Nat. I, 606, f. 46 (1868). 

 — Tryon, Am. Journ. Conch. II, 230, pi. ii, f. 1 (1866). 

 ' Succinea ohliqua, teste Binney, /, c. 



New England and New York. 



Generally considered a variety of S. obliqua. It is a thinner 

 and more fragile shell, proportionally more ventricose in form, 

 with a shorter spire and larger aperture ; 

 it has a- decided green color, almost un- 

 shaded with yellow, while in S. obliqua 

 the amber yellow predominates. 



Jaw arcuate, ends blunt; anterior 

 surface with three heavy folds, modify- 

 ing the concave and convex margins. 



Lingual membrane with 100 rows of 

 (3,3 1 — 33) long, slender teeth ; cen- 

 trals tricuspid, laterals bicuspid ; uncini 



Fig. 477. 



Jaw of Succinea totteniana. 

 [Morse] 



short, with three short teeth. 



