424 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



nutely wrinkled or striated ; whorls rather more than three, the last very- 

 large, and much expanded, and more or less oblique ; spire very small, not 

 prominent nor pointed ; suture distinct, impressed ; aperture oval, large, and 

 expanded, more or less oblique; columellar margin with a slight testaceous 

 glazing ; columella thin, sharp, narrowed ; peristome thin, its edge blunted by 

 the reflection of the periostraca. Greatest length, 25 mill. ; ordinary length, 

 18 mill. 



Succinea obliqua, SAY, Long's Exped., II. 260, PI. XV. Fig. 7 (1824) ; BINNEY'S 

 ed. 32, PI. LXXIV. Fig. 7. ADAMS, Shells of Vermont, 156, with fig. (1842). 

 -DEKAY, N. Y. Moll., 53, PI. IV. Fig. 53 (1843). PFEIFFER, Mon. Hel. 

 Viv., III. 15; in CHEMNITZ, ed. 2, 47, PL V. Figs. 1, 2 (1854). BINNEY, 

 Terr. Moll., II. 69, PI. LXVII. b, Fig. 3, excl. syn., Totteniana. W. G. 

 BINNEY, Terr. Moll., IV. 35 ; L. & Fr.-W. Sh., I. 265 (1869). LEIDY, T. M. 

 U. S., I. 258, PI. XIII. Figs. 1-3 (1851), anat. TRYON, Am. Journ. Conch., 

 II. 232 (1866). GOULD and BINNEY, Inv. of Mass., ed. 2, 447 (1870). 



Succinea ovalis, SAY, Journ. Aead., Nat. Sci. Pliila., I. 15 (1817) ; Nich. Encycl., 

 3d ed. (1819); BINNEY'S ed. 8. ADAMS, Shells of Vermont, 156 (1842). 

 DESHAYES, in Encycl. Meth., II. 20 (1830); FER., Hist., 1. c., II. 139 (excl. 

 syn., GOULD); in LAM., ed. 2, VIII. 319. PFEIFFER, Mon. Hel. Viv., II. 

 524 ; III. 15 (excl. syn. GOULD) ; in CHEMNITZ, ed. 2, 48, PI. V. Figs. 3, 4. 



Succinea lineata, DEKAY, N. Y. Moll., 53, PI. IV. Fig. 51 (olim), 1843. 



Succinea campestris of all American authors except SAY. GOULD, Invert., 195, 

 Fig. 126 (1841). DEKAY, N. Y. Moll., 54, PI. IV. Fig. 54 (1843). 



Succinea Greerii, TRYON, Am. Journ. Conch., II. 232, PI. II. Fig. 8 (1866). 



A Post-pleiocene species, now found in the Northern and Interior Regions 

 from Gaspe to Georgia, and from the Red River of the North to Arkansas. 



Animal with eye-peduncles blackish, their base large and conical ; tentacles 

 under the last, white, very small. Head and neck finely mottled with black, 

 mantle grayish, foot light saffron-color, a saffron border around the respiratory 

 foramen. A deep furrow running from under the anterior part of the mantle, on 

 each side, downward and forward, terminating behind the tentacle. Length 

 of the animal somewhat more than that of the shell. 



Like the other species, 'it prefers moist situation?, but it is also spread 

 abroad upon the hillsides, as in Vermont, at considerable distances from 

 water. 



When the shell is oval, the last whorl very ample and expanded, forming 

 nine tenths of the whole volume, and but little oblique, the spire being at the 

 same time very small and not prominent, and the aperture oval and well 

 rounded at both extremities, it is the form described as Succinea ovalis by Mr. 

 Say. The variation to which it is most subject is a lengthening and narrow- 

 ing of all its parts. The spire becomes more produced, and its convolutions less 

 close ; the last whorl is compressed at the sides, and more oblique. The aper- 

 ture by this process becomes elongated and narrow, and its posterior margin 

 more angulated. In this condition it is Succinea obliqua, Say. The extremes 



