244 



II. 



1. Polyarthra platyptera Ehrenberg. Few. 



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

 G., II, 6. 



3. Ploesoma lenticulare 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. Brachionus militarix Ehrenberg. Bare. I have found this an abundant 

 species in ponde 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. andG., Sup. 82. 



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



6. Notholca longispina Kellicott. More abundant than in I. 



III. 



1. Asplanchna priodonta Gosse. Q.uite numerous. Jennings reports this fine 

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

 and G., I, 123. 



2. Polyarthra platyptera Ehrenberg. Several found. 



3. Triarthra longiseta Ehrenberg. Numerous. 



4. Diaschtsa valga Gosse. Only one seen. It appears to agree well with the 

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



5. Anvnea cochlearis Gosse. Not common. 



6. Notholca longiipcia Kellicott. 



Cladocera. A. Birge. 



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

 I enclose list of Cladocera in your bottles. 



1. Holopedmm gibberum Zad., few; Daphnia hyalina and retrocurva Forbes. 

 Much algal material, chiefly Clathrocystis. 



2. Holopedmm gibberum D. retrocurva Sida. crystalline. 0. F. M., Diaphanosoma 

 brachyurum Liev. 



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

 brachyurum. Material looks as if it had been dried. 



