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276 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
GENUS CHYDORUS Leach. 
Chydorus spheericus Miiller. 
Chydorus sphericus—C. L. Herrick, Final Report Minn. Crust., p. 116; PI.!jF, 
Figs: 4, 7, 8, 10. 
Length 0.36 mm. to 0.42 mm.; height 0.31 mm. to 0.36 mm. Habi- 
cat: Ohio, Kentucky, West Virginia, Georgia. This species is very 
abundant. At Atlanta, Georgia, it can be found any time during 
the year. 
FAMILY POLYPHEMIDE. 
GENUS POLYPHEMUS De Geer. 
Polyphemus pediculus De Geer. 
Polyphemus pediculus—C. L. Herrick, Final Report on Minn. Crust., p. 121; PJ. B’, 
Figs. 4-6. 
Habitat: Baxley, Georgia. 
