244 



II. 



1. Poli/diihra plati^ptera Elirenberg. Few. 



2. I'riarthra lonyi.^cta Ehrenberg. Comparatively few in this vial. H. and 

 G.. II, 6. 



3. PliH\ooii)a fenticulare 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). Zocil. Anz., Bd. 10, 577. 



4. Brachionii.< niilifans Ehrenberg. Kare. I have found this an abundant 

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

 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. Anuripa cachlearis Gosse. Many, but far less numerous than in I. 

 G. Xotholra longi-^pinn Kellicott. More abundant than. in I. 



111. 



1. .hplanchno priodonta Gosse. Quite 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. Polyurthra plutyptera Ehrenberg. Several found. 



3. Triarthra louffiseta Ehrenberg. Numerous. 



4. Diai'chisa rah/a Gosse. Only one seen. It appears to agree well with the 

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



5. Aiiiiriin cochlearis Gosse. Not common. 



6. yothoica loiifjii^pcia 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. Holopcdiuiii yibherum Zad., few; Daphnia hyuiiaa and retrocurva Forbes. 

 Much ul(/al material, chiefly Clathrocystis. 



2. Holopediura yibb&rum D. relrocurva Sida. crystallina 0. F. M., Diaphanosoma 

 hrachyuruiH Liev. 



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

 brachyurum. Material looks as if it had been dried. 



