SUCCINEA. 447 



Mackenzie River to the Gulf of Mexico, over all Eastern North 

 America. 



I have much hesitation in deciding upon a name for this shell. 

 It is quite different from any other species I am acquainted with. 

 The spire is longer, and acutely pointed, the body whorl less de- 

 veloped, and the aperture is shorter and more rounded ; but, al- 

 though the suture is deep, it is not so much so as to " give the 

 whorls the appearance of being almost separated from resting on 

 each other," as Mr. Say remarks of S. vermcta. In this character, 

 individuals differ very greatly. Some specimens with unusually lax 

 spires may have been used by Mr. Say in drawing up his descrip- 

 tion. But the young shells present no prominent spire, and a large, 

 rounded aperture, agreeing precisely with Mr. Say's description and 

 figure of S. avara; and they are also always coated with earth ad- 

 hering to a glutinous matter on the surface. It seems probable that 

 the two should form one species ; unless they do, I am at a loss un- 

 der which name to place our shell, as, considering specimens of all 

 ages and forms, it will come under one as well as the other. The 

 name I have chosen is to be preferred, because it is a legitimate 

 Latin word, while the other is not. 



The animal has a dark head, and gives a dark color to the shell ; 

 the foot is very narrow, with a flesh-colored tint. 



Succinea obliqua. 



Fig. 126. 



Shell ovate, thin, transparent, pale yellow; whorls three, not very oblique, 

 very convex ; the last very large and turgid ; suture deep ; aperture sub-oval. 



Succinea obliqua, Say, Long's Exped. ii. 260, pi. 1.5, fig. 7 (1824) ; Binney's ed. 32, pi. 

 74, fig. 7. — Adams, Vermont Moll. 156, with %. (1842). — De Kay, N. Y. Moll. 

 53, pi. 4, fig. 53 (1843). — Pfeiffer, Mon. Hel. Viv. ill. 15; in Chemnitz, 2d ed. 



47, pi. 5, figs. 1, 2 (1854). — BiNNEY, Terr. Moll. ii. 69, pi. 67 6, fig. 3, excl. syn. 

 Totleniana. — W. G. Binney, Terr. Moll. iv. 35 ; Terr. Moll. U. S. i. 258, pi. 13, figs. 

 1 -3 (1851), anat. — Tryon, Am. Journ. Conch, ii. 232 pi. 2, fig. 7 (1866). 



Succinea oralis, Say, J. Ac. N. S. i. 15 (1817) ; Nich. ICncyc. 3d cd. (1819): Binney's 

 ed. 8. — Adams, Vermont Moll. 156 (1842). — Deshayes, in Encyc. Me'th. ii. 20 

 (1830); Fer. Hist. 1. c. ii. 139 (excl. syn. Gould); in Lam. 2d ed. viii. 319.— 

 Pfeiffer, Mon. Hel. Viv. ii. 524 ; iii. 15 (excl. syn. Gould) ; in Chemnitz, 2d ed, 



48, pi. 5, figs. 3, 4. 



Succinea lin'ala, De Kay, N. Y. Moll. 53, pi. 4, fig. 51 (olim), 1843. 



Succinea cnmpestris, of all American authors except Say. — Gould, Inv. 195, fig. 126 



(1841).— De Kay, N. Y. Moll. 54, pi. 4, fig. .54 (1843). 

 Succinea Greerii, Tryon, Am. Journ. Conch, ii. 232, pi. 2, fig. 18 (1866), 



