OF DENISON UNIVERSITY. 
71 
iyAntennae 8-jointed.) 
Sp. 20. Cyclops ftwbbriatus , 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. ii. 
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 Cypris, Mueller. 
Sp. 21. Cypris virens, Mueller. 
Cyyris virens, '='■ '='■ •=' G. S. Brady, Recent British Ostracoda, 
p. 364, pi. XXIII, figs. 23-32; pi. XXXVI, fig. I. 
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, Jurine, 
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 m 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. 
[Plate II; Figs, i-io.] 
In a lateral view, the shell is sub-triangular, highest near the 
middle. The ventral margin is straight, excepting at its cephalad 
