DeRyke and Scott 13 



Fishes examined in this collection 



Perca flavescens Mitchill (yellow perch). 



69 mm. 9 heads of amphipods; 10 Chironomus larvae; 1 Notonecta. 

 113 mm. 2 odonata nymphs; 1 small fish 10 mm. long; 1 back-swimmer; 

 1 amphipod; Hyalella; a mass of fish eggs; 7 small Physa; 1 un- 

 identified insect larva. 

 110 mm. Empty. 



136 mm. 78 haliplidae larvae; 3 Chironomus larvae; a small amount of 

 plant tissue. 

 Lepomis pallidus Mitchill (bluegill). 



120 mm. 2 nematoda; and some encrusted plant tissue. 



130 mm. 83 haliplidae larvae; 15 Physa 1 mm. in diameter; 6 water mites 



and 7 Chironomus larvae. 

 122 mm. Fish eggs, some of them showing well developed embryos; small 

 amount of plant tissue ; 3 small snails 1 mm. in diameter ; 46 haliplidae 

 larvae; 3 Hyalella; 28 Chironomus larvae; 5 ostracods and several 

 fragments of a large insect. 

 Etheostoma caprodes Raf. (log perch). 



71 mm. 26 haliplidae larvae; 1 fish egg and 6 cladocerans mutilated be- 

 yond possibility of identification. 

 Labidesthes sicculus Cope (skipjack). 



65 mm. 3 small snails 1 mm. in diameter; 1 cladocera; 3 Chironomus 

 larvae; 3 haliplidae larvae. 



Collection 12 



June 22, 1920. Potamogeton, Chara and rushes; sand and marl; three 

 feet; clear; clear; 3:00 p. m. ; seine. 



Fishes examined in this collection 



Perca flavescens Mitchill (yellow perch). 

 88 mm. 1 small piece of plant tissue. 

 113 mm. 6 ephemerida larvae; 2 haliplidae larvae; 3 snails; 2 nematoda; 

 a piece of plant tissue. 

 Lepomis pallidus Mitchill (bluegill). 



45 mm. 8 Simulium larvae; 5 cladocerans; 1 large fragment of an insect. 

 110 mm. 15 odonata nymphs; 1 water mite; 1 fish egg; a few fragments 

 haliplidae larvae; some yellow tissue apparently Potamogeton and a 

 large mass of fragments of adult odonatas and odonata larvae. 

 69 mm. A mass of 51 fish eggs containing embryos; 8 Chironomus larvae 

 and several fragments; 1 Hyalella; the head of a small insect larvae. 

 74 mm. 6 fish eggs; Sida crystallina, mutilated so much it was impos- 

 sible to count, probably about 200; 8 Chironomus larvae. 

 44 mm. 12 Sida crystallina; 7 Chironomus larvae; 3 water mites; a 

 few algae fragments; Spirogyra; 2 ostracods; 1 plant seed; many 

 diatoms and a piece of plant tissue, apparently root, 1 mm. x 10 mm. 

 Micropterus salmoides Lacepede (large mouth black bass). 



88 mm. 1 fish 20 mm. long; and 1 Leuceruthrus. 

 Etheostoma caprodes Eaf. (log perch). 



94 mm. 1 amphipod; Hyalella knickerbockeri; 6 Chironomus larvae; 1 

 tricopteron and case, and 1 Simulium larva. 



