OF DENISON UNIVERSITY. 7T 



[Antennae 8-jointed. ) 



Sp. 20. Cyclops fiinbriatus, Fischer. 

 Cyclops crassicornis, * G. S. Brady, British Copepoda, 



Vol. I, p. 118; pi. XXIII, figs. 1-6. 

 Cyclops fimbriatus, * C. L. Herrick, Final Report on 



Minn. Crustacea, p. 162, pi. R, fig. 11. 



This species is abundant in all of our pools. It varies in color 

 from a faint pinkish hue to a brick red. 



ORDER OSTRACODA. 



X. Genus Cvpris, Mueller. 



Sp. 21. Cypris virens, Mueller. 



Cyyris virens, G. S. Brady, Recent British Ostracoda, 



p. 364, pi. XXIII, figs. 23-32; pi. XXXVI, fig. 1. 



Cypris virens, * Brady and Norman, Ostracoda of North 



Atlantic and Northwest Europe, part I, p. 74. 



Cypris virens, C. L. Herrick, Alabama Crustacea, p. 



24; pi. VI, fig. 3. 



This species is abundant in our shallow, grassy ponds. 



Sp. 22. Cypris sp ( ? ) 

 [Plate II; Figs. 11-13] 

 Although agreeing in many particulars with C. virens, J urine, 

 this species differs from it in the following respects : 



1. The caudad half of each valve is marked with a series of 

 concentric lines which in appearance resemble a nest of test tubes that 

 has been bent into the shape of a retort. 



2. The ventrad border of each valve is fringed with a row of 

 tubercles. Each tubercle terminates in a hair. (Some specimens 

 of C. virens are said to possess this feature.) 



3. The caudad margin of the post abdomen is smooth. 



During the summer this species was very abundant in several of 

 our shallow, weedy pools. Among dozens examined no females were 

 encountered. It will be noted that its habitat is the same as that of 

 C. virens. It is possible that it is the male of that species. 



Sp. 23. Cypris herricki, sp. n. 



I Plate II ; Figs. 1-10.] 



In a lateral view, the shell is sub-triangular, highest near the 

 middle. The ventral margin is straight, excepting at its cephalad 



