DeRyke and Scott 29 



57 mm. 1 Hyalella; 8 Chironomus larvae; 1 caddis-fly larva and case. 

 93 mm. 18 Chironomus larvae; 9 ostracods; mass of partially-digested 



animal tissue; a mass of plant tissue; sand and debris. 

 77 mm. 45 Chironomus larvae; 17 cladocera; 5 Cyclops; 11 ostracods; 



1 Physa; algae; sand and debris. 

 106 mm. 1 Planorbis; 37 Chironomus larvae; 1 Chironomus pupa; 8 



Physa; 2 tricoptera larvae; 7 ostracods; 2 odonata nymphs; 1 



Hyalella knickerbockeri ; debris. 



92 mm. 7 ostracods; 15 Chironomus larvae; 2 Simulium larvae; algae; 



partially-digested animal tissue; debris. 



93 mm. 2 Physa: 10 Chironomus larvae; partially-digested insect larva; 



algae and debris. 



94 mm. 1 ephemerid larva; 22 Chironomus larvae; 8 ostracods; 1 Cy- 



clops; 5 cladocera; 2 tricoptera larvae; 1 Physa; algae; sand and 



debris. 

 98 mm. 3 Cyclops; 5 ostracods; 25 Chironomus larvae; 8 tricoptera 



larvae; algae; silt and debris. 

 82 mm. 1 Cyclops; 23 Chironomus larvae; 1 snail; 1 Chironomus pupa; 



algae; sand and debris. 

 97 mm. 1 Cyclops; 12 Chironomus larvae; 1 Simulium; 4 tricoptera 



larvae; algae and sand. 

 Micropterus salmoides Lacepede (large mouth black bass). 



311 mm. 1 tricopteron and case; about 7 cmm. of plant tissue (Ceratophyl- 



lum) ; 3 Leuceruthrus micropteri; a few fish bones and scales. 



61 mm. 1 fish 15 mm.; 2 cmm. fish flesh. 

 Etheostoma caprodes Raf. (log perch). 



62 mm. 2 ephemerida larvae; 29 Hyalella. 



Collection SU 



July 21, 1921. Chara, algae, Potamogeton, rushes; marl; two feet; 

 clear; clear; 11:00 a. m. ; seine. 



Fishes examined in this collection 



Perca flavescens Mitchill (yellow perch). 

 139 mm. 1 fish 13 mm. long. 



Plant tissue; fragment of insect. 



Empty. 



1 large odonatid nymph. 



1 odonata larva. 



2 ephemerida larvae; 1 Chironomus larva; 1 damsel-fly larva. 

 5 cladocerans; 1 Hyalella; 2 Chironomus larvae; 1 tricopteron 



larva; 1 ephemerid larva; 4 ostracods. 

 1 large odonatid nymph. 



5 Hyalella; 1 ostracod; 1 ephemerid nymph. 

 1 Hyalella knickerbockeri; 1 tricopteron larva; 2 Haliplus larvae. 

 1 Physa 1 mm. in diameter; small fragments of fish. 



3 tricoptera larvae; 1 earthworm, 14 mm. long; 1 ephemerid 



