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. 



Sp. 11. Chydorus sphaericus, Mueller. 



Chydorus sphaericus. * C. L. Herrick, Final Report on 



Mian. Crustacea, p. Ii6, pi. F, figs. 4, 7, 8, IO. 



This species is very abundant in shallow, weedy, pools. 



ORDER COPEPODA. 



Family CALANIDAE. 



VIII. Genus Diaptomus, Westwood. 



Sp. 12. Diaptomus pallidas, Herrick. 



Diaptomus pallidus, * C. L. Herrick Final Report on 



Minn. Crustacea, p. 142; 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. 



( Auten nae 1 "7 '-join ted. ) 



Sp- 13- Cyclops ater, Herrick. 



Cyclops ater, C. L. Herrick. Final Report on Minn. 



Crustacea, p. I45; pi. Q2, 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 viridis, Jurine. 



Cyclops viridis, C. L. Herrick, Final Report on Minn. 



Crustacea, p. I45. 



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. 15. Cyclops parCllS, Herrick. 



Cyclops parcus, C. L. Herrick, Final Report 011 Minn. 



Crustacea, p. 145. 



