Turner—Ecological Notes—Cladocera and Copepoda. 153 
free from even a suggestion of ice. Although I did not 
take the temperature of the water in those Ohio ponds, 
yet, since no ice had formed on the surface, it was cer- 
tainly higher than zero centigrade. It seems then that 
a temperature which would be low enough to induce clad- 
ocerans of a cold clime to produce ‘‘winter eggs’’ is not 
necessarily low enough to induce those of a milder climate 
to do so. My records do not show whether or no male 
cladocerans occur in Augusta; the Copepoda, both the 
Calanidae and the Cyclopidae, produce numerous males. 
It is not claimed that observations made throughout one 
winter are sufficient to warrant the assertion that the 
Cladocera of Augusta never form ‘‘winter eggs;’’ but 
this does not militate against the statement made above. 
COPEPODA. 
CALANIDAE. 
pIaPTomus Westwood. 
1. DIAPTOMUS SANGUINEUS Forbes, var. MINNETONKA Her- 
rick. 
Diaptomus sanguineus, Forbes, ’76, pp. 15, 16, 23; fig. 24, 28-30. 
Diaptomus minnetonka, Herrick & Turner, ’95, pp. 71-72; Pl. XIII., 
Fig. 8-10. 
Diaptomus sanguineus, Schacht, 97, pp. 133-137, Pl. XXIII.-XXV. 
Near Augusta, this form, which is abundant, seems to 
be confined to marshes and ditches having a temperature 
of from 10° to 16° C. Associated with it, in addition to 
the entomostracans mentioned in table I., were :—young 
crayfish, Brancippi, Assellidae, gammarids, water-boat- 
men, hydrachnids, and planarians. 
PA DIAPTOMUS STAGNALIS Forbes. 
Diaptomus stagnalis, Forbes, ’82, p. 646; Pl. VIII., Fig. 8, 10-12, 14. 
Diaptomus stagnalis, Herrick and Turner, ’95, pp. 66, 67; Pl. IIT.; 
XIII., Fig. 11, 13. 
Diaptomus stagnalis, Schacht, ’97, pp. 138-141; Pl. XXVIII, Fig. 2. 
Alike D. sanguineus, this species is an inhabitant of 
marshes and ditches; but is more abundant. Ihave never 
found D. sanguineus except in company with D. stagnalis, 
