41.6 UNIONIDiE, THEIR SOFT PARTS 



opening not very large, bordered within with a black line, united below. Color of 

 the mass impure white. 



Near Darien, Georgia, J. Hamilton Couper, Esq. 



Unio oamptodon, Say = Sayii, Tappan. Am. Conch , pi. 42. 



Branchial uterus . No ova were found here, but an immense number were in 



the ovarium. Branchice rather large, light-salmon, curved below, inner ones much 

 the larger, free nearly the whole length of abdominal sack. Palpi large, subtri- 

 angular, united one-third down the posterior edges. Mantle rather thick, thicker 

 and double along the margin, dark-brown inside of the posterior edges. Branchial 

 opening with numerous uncolored papillae, which are branched or dendritic when 

 the water is flowing through. Anal opening small, with numerous minute papillae 

 on the inner edges, except on the upper portion. Super-anal opening large, united 

 below. Color of the mass whitish. 



H. Moores, Columbus, Ohio. 



Remarlcs. — The liver of all the specimens examined — quite a number — were re- 

 markably yellow. Usually in other species it is greenish. The vitellus of the ova, 

 which were granulating, was also found to be more yellow than usual, and was 

 surrounded by pure white liquor amnii. 



Unio rubiginosus, Lea. Trans. Amer. Phil. Soc. (2), vol. iii. pi. 8, fig. 10. Obs. vol. i. p. 41. 



Branchial uterus occupies the whole of both branchial on both sides. The ovisacks 

 are long and narrow, pointed at both ends, and contain about four hundred ova. 

 None were matured into the embryonic shell, and the ovisacks are probably ex- 

 truded before they are so matured. The ova are bright red, minute, in immense 

 quantity, and the color may be seen through the integuments of the abdominal 

 sack as well as in the branchiae. Branchial large, nearly semicircular, the inner 

 ones rather the larger, free nearly the whole length of the abdominal sack. Palpi 

 very wide, thin, subtriangular, united half way down the posterior edges. Branchial 

 opening rather large, with numerous delicate, salmon-colored papillae. Anal opening 

 with very delicate papillae. Super-anal opening small, near to the anal opening and 

 united below. Color of the mass white or salmon-color, sometimes deep orange, 

 much deeper in the adductor muscles and in the foot, which is remarkably triangular 

 in its form. 



Cincinnati, T. G. Lea and D. II. Schaffer; Columbus, Ohio, H, Moores. 



Remarks. — The U. sxtbrotundus was the first species I met with which has that 



remarkable characteristic of bright red eggs. It is also remarkable in having the 



branchial uterus pervading all the four leaves of the branchice. Subsequently I found 



that TJ. rxdnginosus and JEsopus had this remarkable character of red eggs, but the 



