408 UNIONIDiR, THEIR SOFT PARTS 



opening very small, with small brown papillae. Super-anal opening very long, united 

 below for a short distance. Color of the mass whitish. 

 Uchee Bar, Georgia, Bishop Elliott. 



Unio Barkattii, Lea. Trans. Amer. Phil. Soc, vol. x. pi. 13, fig. 5. Obs. vol. v. p. 12. 



Branchial uterus occupies the whole of the outer leaves of the branchiae. Bran- 

 chiae wide, gently curved below, inner ones the larger, united more than half the 

 length of abdominal sack. Palpi rather long, subangular, united only a short dis- 

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

 opening large, with numerous brown papillae. Anal opening large, with small brown 

 papillae. Super-anal opening very long, slightly united below. Color of the mass 

 light salmon. 



Embryonic shell short pouch-shape, whitish, nearly the same with phaseolus, has no 

 hooks. See Journ. Acad. Nat. Sci., vol. iv. pi. 5, fig. 12. Obs. vol. vi. p. 47. 



Buck Head Creek, Burke County, Georgia, Bishop Elliott. 



Unio Sloatianus, Lea. Trans. Amer. Phil. Soc., vol. viii. pi. 16, fig. 33. Obs. vol. iii. p. 55. 



Three specimens all males. 



Branchiw very large, thin, nearly circular below, inner ones much the larger, free 

 nearly the whole length of abdominal sack. Palpi rather small, rounded below and 

 not united on the posterior edges. Mantle thin, with a broad margin, blackened on 

 the inner posterior border. Branchial opening large, with numerous dark-brown 

 papilla?. Anal opening very large, with numerous minute dark-brown papillse. 

 Super-anal opening very large, colored on the inner edges and not united below. Color 

 of the mass whitish. 



Flint River, Georgia, Bishop Elliott. 



Unio subangulatus, Lea. Trans. Amer. Phil. Soc, vol. viii. pi. 13, fig. 23. Obs. vol. iii. p. 47. 



Branchial uterus occupies about half the length of the outer branchiae, but does not 

 extend to the posterior end ; the ovisacks are large and numerous (in one specimen 

 seventeen, in the other thirty), inserted half way up the leaf and pendant below the 

 line of the branchiae. Branchiae very large, nearly semicircular below, inner ones 

 much the larger, united the whole length of the abdominal sack. Palpi rather 

 large, suboval, united a short distance on the posterior edges. Mantle thin, with a 

 rather narrow, thickened border, fringed and colored from the branchial opening to 

 the base. Branchial opening rather large, with numerous brown papillae on the 

 inner edges, the inner ones being much the largest. Anal opening moderately large, 

 with numerous minute brown papillae on the inner edges. Super-anal opening rather 

 small and united below. Color of the mass light salmon. 



