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 Leydig. 



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. XXVII., fig. 6; pi. XXXV., fig. 16; pi. XLIX., 



fig. 3-5; pi. LIIL, 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. 



