AND EMBRYONIC FORMS. 407 



Embryonic shell elongate pouch-shape. See Journ. Acad. Nat. Sci., vol. iv. pi. 5, 

 fig. 1. Obs. vol. vi. p. 46. 



Ucb.ee Bar, below Columbus, Georgia. Bishop Elliott and Dr. Niesler. 



Unio infucatus, Con. New Pr. Wat. Shells, pi. 3, fig. 2. 



Branchial uterus . No ova were found here, but they were found in the 



ovarium. Branchial large, subangular, rounded below, inner ones much the larger, 

 free for a short distance. Palpi large, falcate, united more than half way down "the 

 posterior edges. Mantle very thin, thickened at the margin. Branchial opening 

 large, with numerous brown papilla. Anal opening without papillae. Super-anal 

 opening large, colored within the edges, united below. Color of the mass white. 



Uchee Bar, below Columbus, Georgia, Bishop Elliott; and Roswell, Cobb County, 

 Georgia, N. A. Pratt, Jr. 



Unio lineatus, Lea. Trans. Amer. Phil. Soc, vol. viii. pi. 12, fig. 20. Obs. vol. iii. p. 44. 



Branchial uterus occupies the posterior part of the outer bronchia in about a 

 dozen large ovisacks, like cariosus, the lower border being blackish. Branchiae 

 rather large, rounded below, inner ones much the larger anteriorly, united the whole 

 length of abdominal sack. Palpi large, semilunate, united two-thirds down the 

 posterior edges. Mantle rather thin, thickened at the margin, furnished with a 

 thickened, fleshy, fringed process below the branchial opening. This process is 

 bright brown or reddish, with a black border, and immediately below the branchial 

 opening. On this process there is, on the outer edges, a corresponding round black 

 dot on each side, which put on the appearance of eyes. These spots are 

 very much the same as in racliatus* Branchial opening small, with numerous brown- 

 ish papilla. Anal opening small, with very minute brownish papilla. Super-anal open- 

 ing rather large, reddish within the edges, not united below. Color of the mass whitish. 

 ^ Embryonic shell elongate pouch-shape, white, very much in outline like anodontoides. 

 See Journ. Acad. Nat. Sci., vol. iv. pi. 5, fig. 2. Obs. vol. vi. p. 46. 



Uchee Bar, Georgia, Bishop Elliott; and Altamaha River, J. Postell. 

 Unio limatulus, Con. Journ. Acad. Nat. Sci., vol. i. 2d ser. p. 276. 



Branchial uterus . No ova were found here, but they were found in the 



ovarium. Branchiae large, very much curved below, angular at the posterior end, 

 inner ones much the larger, attached by a thread-like muscle to the margin, free 

 nearly the whole length of the abdominal sack. Palpi wide, subangular, united 

 only at the upper part of the posterior edges. Mantle very thin, slightly thickened 

 at the margin. Branchial opening small, with very small brownish papilla. Anal 



* See Observations, vol. ii, pi. 15. fig. 49. 



