OF DENISON UNIVERSITY. 23 



Cetiodaphnia mcgops, Sars. 



Ceriodaph?iia crtstata, . . . E. A. Birge: Notes on Cladocera,(i878) 

 p. 6; pi. II, fig. 8, 9. 



Ceriodaphina megops, . . . G. L. Herrick : Final Report on Minn. 



Crust. (1884) p. 36-37; pi. A, fig. 14, 19. 



Length, 0.85 mm. Height, 0.52 mm. 

 Habitat: Atlanta, Ga, South River Slough, Nov. 17th., 

 1893. 



Genus Simocephalus. 

 Siinocephahis semdatus, Koch. 



Simocephalus Americamis^ . . . E. A. Birge : Notes on Cladocera. 

 (i878)[p. 6-8; pi. I, fig. 6. 



Simocephalus serrtilahis, . . . C..L. Herrick. Final Report on 



Minn. Crust, p. 46 (1884). 



Length, 1.7 mm. -1.9 mm. Height, 1.43, mm. 



Habitat: Atlanta, Ga., South River Slough. The speci- 

 mens examined were covered with Vorticellidae. These are 

 found at all seasons, Specimens collected on the 1 7th of Nov- 

 ember, 1893, were still laying summer (parthenogenetic) eggs. 



Family BOSMINID^ 



Genus Bosmina. 



Bosmina atlaniaensis^ sp. n. 

 {PL VII, fig. 12.13.) 



Length, 0.46 mm. Height, 0.36 mm. 



The shell of this form is smooth. The flagellum is much 

 nearer to the eye than it is to the sensory setae of the antennae. 

 For details the figure will answer. 



Habitat: Atlanta Ga., South River Slough. During the 

 winter this form was very common. It appeared, in company 

 with Cypiis Biiriingtoiicnsis just after a series of rains, but it 

 remained longer than the latter species. During that time, 

 these creatures were very numerous. 



