OF DENISON UNIVERSITY. 
69 
Its caudad border is supplied with a row of sharp teeth. The distal 
teeth are the longest, thence they gradually decrease in length. The 
terminal claw of the post abdomen is supplied with two short basal 
spines. 
VII. Genus Chydorus, Leach. 
II- Chydorus sphaericus, Mueller. 
Chytlorus sphaericus. C. L. Herrick, Final Report on 
Minn. Crustacea, p. 116, pi. F, figs. 4, 7, 8, 10. 
This species is very abundant in shallow, wredy, pools. 
ORDER COPEPODA. 
Family CALANIDAE. 
VIII. Genus Diaptomus, Westwood. 
Sp. 12. Diaptomus pallidas, Herrick. 
Diaptomus palliaus, '=■ C. L, Herrick Final Report on 
Minn. Crustacea, p. I42; pi. Q. fig. 17. 
This species is quite abundant in two or three of our shallow 
ponds. Its transparency renders its detection difficult, 
IX. Genus Cyclops, Mueller. 
( A uten nae ij-join ted. ) 
Sp- 13- Cyclops ater, Herrick. 
Cyclops ater, ® C. L. Herrick. Final Report on Minn. 
Crustacea, p. I45; pi. Q'2, figs. 9-12, 
Cyclops ater, * C. L. Herrick, Crustacea of Alabama, 
P- 14- 
This species is occasionally encountered in the larger canal basins. 
Sp- 14- Cyclops viriddS. Jurine. 
Cyclops viridis, '''■ '=• '''' C. L. Herrick, Final Report on Minn. 
Crustacea, p. 145. 
This species is found in all of our waters. It is especially abun- 
dant in stagnant water. Occasionally this animal is colorless, but 
usually it is rendered green by myriads of green infusoria which at- 
tach themselves to its body. Occasionally species of Vorticellidae 
are seen attached to its body. 
Sp- '5- Cyclops parcus, Herrick. 
Cyclops parcus, * ''■ C. L. Herrick, Final Report on Minn. 
Crustacea, p. 145. 
