April, 1921. 



The Canadian Field-Naturalist. 



3 



Order Cladocera. 



DiaphcDiosoma leuchtenbergianum. Pis- 

 clier. Frequent in planeton at 1 metre in 

 Lake Missanag, Frontenac County, Out., 

 Aug. 30. 



Holopedium gihherum. Zaddaeh. Scarce 

 in surface planeton, Lake of Bays, Musko- 

 ka, Ont., Aug\ 24. 



Daphnia pnlex de Geer. Well water, 

 Guelp'h, Ont. "Well water, Harrowsmith, 

 Ont. Pool in woods, Avlmer, Ont. ; col- 

 lected by H. C. White. 



Daphnia longispina hyalina, Ley dig. 

 Common in surface planeton, Lake of 

 Bays, Muskoka, Ont., Aug. 24. Abundant in 

 surface planeton, mouth of the Cataraqui 

 River, Ont., Nov. 5. 



Daphnia longispina hyalina mendotae, 

 Birge. Common in surface planeton, 

 mouth of the Cataraqui River, Ont. Nov. 5. 



Simocephalns vefulus, 0. F. Miller, 

 Common among decaying vegetation at the 

 bottom of a shallow c/iannel in a marsh 

 on the Cataraqui River, Ont. 



Ceriodaphniu megalops, Sars. Scarce in 

 the same habitat as the preceding. 



Bosmina longirostris, 0. F. Miiller. Com- 

 mon in surface planeton, Lake of I>ays, 

 Aug. 24. Common in surface planeton, 

 mouth of the Cataraqui River, Ont. 



Bosmina longispina, Leydig. Common 

 in planeton at 1 metre. Lake Missanag, 

 Ont., Aug. 30. 



Alona guttata, Sars. Scarce in surface 

 planeton in s'hallow channel in a marsh on 

 the Cataraqui River, Ont., Nov. 5. 



Chydoius sphae)icus, O. F. Muller, 

 ( 'ommon in surface planeton, mouth of the 

 Cataraqui River, Ont., Nov. 5. 



Polyphemus pediodus, Linn. Fre- 

 quent in planeton at 1 metre. Lake Missa- 

 nag, Ont. 



moil among acpiatic vegetation at mout.ii 

 of the Cataraqui River, Ont. Common in 

 a marshy pond near Kingston, Ont. 



Cyclocypris laevis, O. F. Miiller. Com- 

 mon among filamentous algae at the mouth 

 of the Cataraqui River, Ont. 



Cypris dentata, Sharpe. Abundant in 

 a pool near Kingston, Ont.; collected by 

 H. C. White. 



Cypris testudinaria, Sharpe. Common 

 in a pool in the woods, Avlmer, Ont., May; 

 collected by H. C. White. 



Order Copepoda. 



Diaptomus oregonensis, Lilljeborg. Ab- 

 undant in planeton at 1 metre, Lake Mis- 

 sanag, Ont. Common in surface planeton, 

 mouth of the Cataraqui River, Ont. 



Cyclops hiscupidatus, Claus. Common 

 in surface planeton. Lake of Bays, Ont., 

 Aug. 24. Common in surface planeton, 

 mouth of the Cataraqui River, Out., Nov. 

 5. Common in surface planeton, Lake On- 

 tario, Dec. 15. 



Cyclops viridis brevispinosus, Herrick. 

 Common in planeton at 1 metre. Lake 

 Missanag. Aug. 30. 



Cyclops fimbriatus, Fischer. Scarce in 

 channel in inars^i at mouth of Cataraqui 

 River, Ont. 



Canthocaniptus minutus, Claus. Scarce 

 in surface planeton. Lake Ontario at King- 

 ston, Dee. 15. 



N. B. Since the above was written, 

 copies of Parts H and J of Vol. 7 Report 

 of the Canadian Arctic Expedition con- 

 taining records of Arctic Cladocera by 

 Dr. Juday and Copepoda by Dr. Marsh 

 have come to hand.^ 



Order Ostracoda. 

 Cypridopsis vidua, 0. F. Miiller. 



Com- 



1 Dr. Robert Chambers in Biological Bulle- 

 tin, Vol. 22, p. 293, mentions the" occurrence 

 of Cyclops parens and C. Americanus at To- 

 ronto. The Euphyllopoda and jiarasitic Cope- 

 poda have not been considered. Ed. 



