ORDER BRANCHIOPODA — CYTHERINA. 65 



(EXTRALIMITAL.) 



C. agilis. (Haldeman, Proc. Acad. Nat. Sc. 1841.) Height rather more than half the lengtli. Base 

 subrectilinear. Color, light ochraceous. Ditches. Lancaster county, Pennsylvania. 



C. simplex. (Id. lb.) Elongated, nearly straight; both ends alike. The same locality with the 

 preceding. 



Genus Cytherina, Lamarck. Form of the preceding ; antenna two, hairy throughout their length ; 



head concealed. Feet eight, chiefly marine. 

 C. bifasciaia. (Say, 1. c. p. 439.) Valves clothed with minute dense hairs. Antennae as long as the 



valves. Color, greenish testaceous tipped with black ; two black bands ; feet white. Length, 0-05. 



Pools of fresh water. Georgia and Florida. 



Genus Daphnia, Muller. Shield subunivalve, opening longitudinally on one side. Two branched 

 antennae, or anterior feet, arising from the sides of the neck. Eight to twelve feet. Fresh- 

 water pools. 

 B. angulata. (Say, I.e. p. 440.) Sides striate with numerous parallel minute oblique lines ; hind 



edge of the body with a prominent angle in the middle. Antennas with four filaments on the upper 



and five on the lower branch. Color, white or red. Length, 0*1. Stagnant water in the forests 



of the Southern States. 

 B. rotundala. (Id. 1. c.) Body rounded behind. Upper antennae three-branched: a small spine 



above at the joints; lower, five-branched. Ci^^or, white. Length, 0- 05. Same locality with the 



preceding. 



Fauna — Part 6*. 





■a*- 



