SUCCINEA. 423 



the whorls a little tabulated posteriorly ; aperture narrow-ovate, acute poste- 

 riorly ; the columella has an indistinct fold. Length, 7 mill. ; breadth, 3 mill. 



Succinea aurea, LEA, Trans. Am. Phil. Soc., IX. 4 ; Obs., IV. 4 (1844) ; 



Proc., 1841, II. 32. PFEIFFER, Mon. Hel. Viv., II. 325. BINNEY, 



Terr. Moll., II. 76, PL LXVII. c, Fig. 2. W. G. BINNEY, Terr. 



Moll., IV. 37. L. & Fr.-W. Sh., I. 264 (1869). TRYON, Am. 



Journ. Conch., II. 241 (1866). 

 Succinea ovalis, var., ANTHONY, Shells of Ohio (1843), No. 45, no descr. 



A species of the Interior Region, but restricted as far as yet known 

 to Ohio. 



Animal not observed. 



This small species is about the size of S. avara, but it is less ventricose in 

 form, and of a more vitreous structure, and more yellow cast of color. The 

 aperture, especially, is far less rounded ; indeed, it is more narrow than in any 

 other American species. 



Succinea Groenlandica, BECK. 



Shell elongated, rather heavy, lightly wrinkled, of a light horn-color mixed with 

 white; spire scalariform, bulbous; whorls 4, the penultimate quite 



Fig. 302. convex, the last equalling two thirds the length of the shell ; colu- 

 mella receding and narrowed, covered with a white callus ; aper- 

 ture oval ; peristome simple, the right margin covered. Greatest 

 length, 8 mill. ; breadth, 5^ mill. ; length of aperture, 5, breadth' 

 3'- mill. 



S. Grcenlandica. 



Succinea Grcenlandica, BECK, Ind. PFEIFFER, Mon. Hel. Viv., 

 II. 529. MOLLER, Ind. Moll. Gr., 4 (1842). W. G. BINNEY, Terr. Moll., 

 IV. 38, PI. LXXX. Fig. 4 ; L. & Fr.-W. Sh., I. 265 (1869). TRYON, Am. 

 Journ. Conch., II. 234, PI. II. Fig. 13 (1866). MORCH, Am. Journ. of 

 Couch., IV. 31, PI. III. Fig. 10 (1868). 



Greenland and Iceland, and perhaps Denmark (Morch., 1. c.). I must treat 

 it as one of the circumpolar species of the Northern Region. 

 Animal not observed. 



This species is easily distinguished by its bulbous, turreted spire, and by its 

 litrht horn-color, broken by longitudinal white vittae. When the epidermis is 

 removed, the shell is of a dead white. The specimen figured is in Mr. Bland's 

 collection. 



The jaw is said by Morch to have lateral denticles as in S. amphibia. 



Succinea obliqua, SAY. 

 Vol. III. PL LXVII. b Fig. 3. 



Shell ovate, pale green, yellowish-green, amber-colored, or cinereous, very 

 thin and fragile, pellucid, sometimes roseate at apex ; periostraca shining, mi- 



