OF DENISON UNIVERSITY. . 5 



Wisconsin, and by Prof. Herrick in Minnesota, yet it agrees with 

 Prof. Herrick's description in all other respects. Legth, 0.63 mm. 

 Height, 0.42 mm. 



Habitat : Shallow, grassy creek, Lockland, O. 



Genus Leydigia, Kurz. 



Leydigia qiiadrangularis , Leydig. 



Leydigia qtiadrangu/aris, . . . E. A. Birge. List of Crust. Clad. 



f. Madison, Wis., 1891, p. 393. 

 Leydigia quadrangularis, . , . C. L. Herrick, Final Report. 



Minn. Crust., 1884, p. ?>?,, pi. H., fig. 4. 



Length, about i mm. Height, about 0.5 mm. 



Habitat : Clifton, in large canal basin, on bottom, not abundant. 

 July. Lockland, shallow, sluggish, weedy creek ; abundant. Sep- 

 tember. 



Genus Dunhevidia, King. 



Dnnhevidia se tiger, Birge. 



Crepidocercus setiger, , . . E. A. Birge. Notes on Cladocera, 1878, 



p. 26; pi. I, fig. 18. 

 Dunhevidia sedge)', . . . C. L, Herrick. Final Rep. Minn. Crust. 



1884, p. 91; pi. F, fig. 13. 

 Dunhevidia {crepidocercus) setiger, . . . E. A. Birge. List of Crus- 



tacea Cladocera from Madison, Wis.; p. 394; pi. XHI, fig. 20. 



This species has been encountered here but once. On the 28th 

 of August, 1892, several were found in a small weedy pool. 

 Length of female about 0.43 mm. Height of same about 0.31 mm. 



Genus Alona. Sars, 1862. 



Alona porrecta , B i r ge . 



Alona porrecta, . . . E. A. Birge. Notes on Cladocera, 1878, pp. 



29-30; pi. I, fig. 16. 



Additional locality : Shallow, weedy, canal basin in Camp 

 Washington. 



Length of female, 0.35 mm. Height, 0.22 mm. 

 Alona glacialis, Birge. 



Alona glacialis, . . . E. A. Birge. Notes on Cladocera, 1878, 

 PP- 30-31- 



Genus Pleuroxus. 



Pleuroxus dcnticulatus, Birge. 



Pleuroxus dcnticulatus, . . . E. A. Birge. Notes on Cladocera, 



pp. 21, 21 ; pi. I, fig. 21. 

 Pleuroxus dcnticulatus, . . . E. A. Birge. List of Cladocera from 



Madison, Wis., 1891, p. 395 ; pi. XIII, fig. 21. 



