i3o 



COMMUNITIES OF SMALL LAKES 



leaves of the divided leaved plants the midge larvae, damsel-fly nymphs, 

 and May-fly nymphs (Callibaetis sp.) are usually numerous. All these 

 are important as fish food. This area is the feeding-place for a number 

 of fishes. Those feeding in the vegetation are the subfishes, basses and 

 perches, most of which breed on the barren shoals. With them are also 

 the carp, the chub-sucker, the warmouth bass, the brook silverside 

 (Labidesthes sicculus), and the buffalo fish (84). This part of the lake is 

 also the favorite haunt of the turtles (107), such as the soft shell (Aspi- 

 donectes spinifer), and in the parts with some bare bottom the musk 



^ 



80 * 81# 



Fig. 79. — Shelled protozoan (Difflugia pyriformis Verty .) (after Leidy). 

 Fig. 80. — A red mite {Limnochares aquaticus) ; 6 times natural size (after Wolcott) . 

 Fig. 81. — Dorsal view of an ostracod (Cypridopsis vidua)] 80 times natural size 

 (after Brady). 



Fig. 8i#. — The same seen from the side. 



turtle (Aromochelys odorata), and the geographic turtle (Graptemys geo- 

 graphicus). The mud puppy (Necturus maculosus) is also found in such 

 situations (fide Mr. Hildebrand). The muskrat (Fiber zibethicus) 

 builds its nest (Fig. 82) in the. shallow water adjoining these situations. 

 The musk turtle frequently deposits its eggs on the nest in early 

 summer (105). We have found them in these situations in the month 

 of June. Various aquatic birds feed here (108). This formation may 

 be characterized as belonging to the aquatic vegetation, but practically 



