244 



II. 



1. Polyarthm plutyptera Ehrenberg. Few. 



2. Triarthra Imcjiseta Ehrenberg. Comparatively few in this vial. H. and 

 G., II, 6, 



3. Ploesoma Itnticulare Herrick. Very many. It occurs in the lakes of 

 Europe. In this country it has been reported only from Lake St. Clair, both in 

 bottom and surface tows (Jennings). Zool. Anz., Bd, 10, 577. 



4. Brackionus militant Ehrenberg. Rare. I have found this an abundant 

 species in ponds of western New York ; it is a good sailor, preferring small seas, 

 however. Authors have recorded the fact that the posterior spines are not in the 

 same horizontal plane. This seems to be in relation to the habit of always turn- 

 ing on its long axis as it swims ; they appear to bore their way through the water. 

 H. and G., Sup. 82. 



5. Anurcea cochlearis Gosse. Many, but far less numerous than in I. 



6. Xotholca longiftpina Kellicott. More abundant than in I. 



III. 



1. Asplanchna priodonta Gosse. Quite numerous. Jennings reports tliis tine 

 species as abundant in Lake St. Clair, both at the surface and in deep water. H. 

 and G., I, 123. 



2. Polyarthra plati/ptem Ehrenberg. Several found. 



3. Triarthra lomjisetu Ehrenberg. Numerous. 



4. Biaxchim vaUja Gosse. Only one seen. It appears to agree well with the 

 figure and description. H. and G., II, 77. 



5. Anurtm cochlearis Gosse. Not common. 



6. Nothoica loiif/ispcia Kellicott. 



Cladocera. a. Birge. 



The following letter on the Chtdoceru of Turkey Lake has been received : 

 I enclose list of Cladocera in your bottles. 



1. Holopediuni gibberum Zad., few; Daphnia hjalina and retrocurvu Forbes. 

 Much alijal material, chiefly Clathrocystis. 



2. Holopedium gibherum D. relrocurva Sida. erystallina 0. F. M., Diaphanosoma 

 brachyurum Liev. 



3. D. retrocnrva, extreme form of hemlet, like that of Lake Mendota, Diaph. 

 brachyurum. Material looks as if it had been dried. 



