& 



SOME PLANKTON hTUDIES IN THE GREAT LAKES. 135 



The fish which occur in the lake are the usual and well-known inhabitants of 

 these waters and need not be enumerated here. A few frogs and turtles and many 

 gulls and terns complete the list of the fauna. The roily water of the lake, especially 

 near the shore, is probably not favorable to the existence of many species of protozoa, 

 sponges, bryozoa, or littoral Crustacea. The total number of species found in the lake 

 can not be stated until the collections have been more exhaustively studied. So far 

 as studied the collections show species distributed as follows: 



Plants: 



Phanerogams (17 of these are littoral, 1 to 6 feet of water) 52 



Of these, hut 3 (Elodea, Xaias, arid Valisveria) occur on the bottom usually 

 in deep water; the others are in shallow water (5 to 12 feet) and reach 

 the surface or extend above it. 



Characew 5 



Alga;, filamentous: 2 (Vauclieria, Cladophora) on the bottom in deep water; 2 



(Spyrogyrce) floating in shallow water 4 



Alga?, other: 31 pelagic; 65 attached to or associated with larger plants 96 



157 

 Animals : 



Protozoa 14 



Sponges 1 



Hydroids (Hydra). 2 



Rotifers : pelagic 18, on bottom in deep water 42, near shore 57 117 



Bryozoa 1 



Annelida, estimated at about 15 



Platyhelminthes and Nemathelminthes (including parasites)- 166 vials of 

 material were preserved ; the number of species cannot be stated. 



Crustacea, at least 36 



Hydrachnids 36 



Insects and insect larva' 75 



Mollusca 35 



Fishes: Ganoids, 3; Teleosts, 22 25 



The total is not less than 500 species and may reach 600. 



Many of the species above recorded are now known to be new, and the study of the 

 collection will doubtless discover a still larger number of undescribed species. The 

 new forms are, for the most part, among the rotifers, hydrachnids, and parasitic worms, 

 though there are a few new Crustacea, annelids, and protozoa. 



In addition to the work which has been done in the identification of these forms 

 by the laboratory staff, the following gentlemen have undertaken to work up the 

 groups set opposite their names. 



Dr. R. Blanchard, Paris, France; the leeches. 



Dr. E. A. Birge, University of Wisconsin; the cladocera. 



Dr. G. Eisen, San Francisco; the oligochaeta. 



Prof. C. D. Marsh, Ripon, Wis.; copepoda. 



Dr. W. McM. Wood worth, Harvard College; the turbellaria. 



Aid has also been received in the identification of the mollusca from Mr. Bryant 

 Walker, of Detroit; in the characese from Dr. T. F. Allen, of New York City ; and in the 

 desmidaceai and unicellular algae from Mr. L. 1ST. Johnson of the botanical department 

 of Michigan University. 



