Turner—Ecological Notes—Cladocera and Copepoda. 161 
21. SIMOCEPHALUS VETULUS Mueller. 
Simocephalus vetulus, Birge, ’78, p. 8. 
Simocephalus vetulus, Herrick & Turner, ’95, p. 178; pl. XLIV., 
fig. 7; LII., fig. 6-9. 
This form was found, in large numbers, in three tem- 
porary ponds, the water temperature of which was 4° C. 
to 8° C. 
292. SIMOCEPHALUS SERRULATUS Koch. 
Simocephalus americanus, Birge, ’78, pp. 6-8; pl. I., fig. 6. 
Simocephalus cerrulatus, Herrick & Turner, ’95, p. 179. 
Simocephalus americanus, Herrick & Turner, ’95, p. 179; pl. 
XLV., fig. 9. 
About Augusta, this form is abundant in ditches, 
marshes, no-outlet ponds, and holes fed by creeks. The 
temperature of the water in which it was found varies 
from 4° C. to 29° C. 
In addition to the Entomostraca mentioned in the table, 
associated with it were hydrachnids, gammarids, may-fly 
larvae, diving beetles, water-boatmen, Brancippus, drag- 
on-fly larvae, and Limnaeus. 
DAPHNIA Schoedler. 
23. DAPHNIA SCHOEDLERI Sars. 
Daphnia schoedleri, Herrick & Turner, 795, p. 193. 
This species was found in temporary ponds with a 
water temperature of from 8° C. to 15° C. The number 
of teeth upon the postabdomen varied from six to ten, 
otherwise it corresponds with the species found by Brady 
in England. 
24. DAPHNIA HYALINA Leydig. 
Pl, RAAVUT F) £8. 
Daphnia laevis, Birge, ’78, pp. 12-13; pl. II., fig. 5-7. 
Daphnia hyalina, Birge, 91, pp. 388-389. 
Daphnia hyalina, Herrick & Turner, ’95, pp. 195-196; pl. XXIL., 
fig. 7, 8; pl. XXVII., fig. 6; pl. XXXV., fig. 16; pl. XLIX., 
fig. 3-5; pl. LIII., fig. 1-4. 
This form was very abundant in two of the large no- 
outlet ponds. It was found in water with a temperature 
of from 19° C. to 20° C. 
