Turner — Ecological Notes — Cladocera and Copepoda. 161 

 21. siMocEPHALus vetulus Mueller. 



Simocephalus vetulus, Birge, '78, p. 8. 



Simocephalus vetulus, Herrick & Turner, '95, p. 178; pi. XLIV., 

 fig. 7; LIL, 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. 



22. SIMOCEPHALUS SERRULATUS Koch. 



Simocephalus americanus, Birge, '78, pp. 6-8; pi. I., fig. 6. 



Simocephalus cerrulatus, Herrick & Turner, '95, p. 179. 



Simocephalus americanus, Herrick & Turner, '95, p. 179; pi. 

 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, '95, 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 Ley dig. 



pi. XXXVII. f. 1-8. 



Daphnia laevis, Birge, '78, pp. 12-13; pi. II., fig. 5-7. 



Daphnia hyalina, Birge, '91, pp. 388-389. 



Daphnia hyalina, Herrick & Turner, '95, pp. 195-196; pi. XXII. , 



fig. 7, 8; pi. XXVIL, fig. 6; pi. XXXV., fig. 16; pi. XLIX., 



fig. 3-5; pi. LIU., 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. 



