All Zonks 



COMl'AUIHON OK yPEc:iIi:s LISTS; LOWKR PEORIA LAKE 

 WUTE WaTEBS 



1922: IS Btatious: 3 cross-sections 1920: 19 atatlons; 6 cross-sectiona 1922: 14 stations; 4 cross-sections 1920: 14 stations; B croas-sectlons 



rOia.l)T10NAI^ MOKE TOLKKANT, OR DOUllTFUL 



Worms (Tuhificidac and Naididae) 



Linmodrilus hoffmeistori ClaiiarSde 



Limnodrilus n. sp. 



Tubifex (ubifex (Miiller) or var.? 



New genus 



Other unidentified, Immaturo 



4+ 



At least 3 unidentified spp. 



3 



Erpolidella punctata (Leidy) 

 Helobdella staEnalis (Linnaeus) 

 Helobdella nepheloidea (Graf) 

 Dina parva Moore 

 4 



Leeches 



Erpobilella punctata (Leidy) 

 Helobdella stagnalls (Linnaeus) 



Pollutional or more tolerant midge larvae 



Chironomus plumosus Linnaeus 

 Chironomus plumosus Linnaeus, var. 

 Cbironomus maturus Jobannsen 



Chironomus plumosus Linnaeus 

 Chironomus plumosus Linnaeus, var. 

 Chironomus maturus Johannsen 

 Chironomus frequens Johannsen 

 4 



Midue larvae of doubtful status 



Chironomus digitatus Malloch 

 Tanypus monilis Linnaeus 

 Chironomus sp. or spp. 

 Procladius sp. or spp. 

 Tanypus sp. or spp. 



Chironomus crasslcaudatus Malloch 

 Palpomyia longipennis Loew? 

 Chironomus sp. or spp. 

 Tanypus sp. or spp. 



4+ 



Unusually tolerant snails 

 Musculium transversum Say i MuscuHum transversum Say 



1 I 1 



LESS TOLEltANT GROUP ( SNAILS ONLY) 



Less tolerant snails, first group, (upper lake, farthest northward 

 occurrence, 1922) 



Pisidmm compressum Prime 

 Pisidium pauperculum, var. crystal- 



ense Sterki 

 Campeloma subsolidum Anthony 



Pisidi 

 Camp' 



:'m f'ninr 

 uiiini Anihdiiy 



Less tolerajit snails, second group, (middle lake, farthest north- 

 ward occurrenee, 1922) 

 Sphaerium stamineum Conrad I Sphaerium slaminsum Conrad 



^ I 1 



CIJIAXER WATKB OK LESS TOLERANT ASSOCL\TED GROUP 



Mussels 

 Anodonta imbeeiUis Say j Quadrula plicata Say 



Goniobasis livescens Menke 

 1 



Snails 



Goniobasis livescens Menke 

 Pleurocera elevatum, var. lewisii Lea 

 2 



Plumatella princep.s. var. fruticosa 



Kraepelln 

 1 



Bryozoa 



Plumatella princeps, var. fruLicosa 



Kraepelin 

 1 



l-'nidentified species 

 1 



Sponges 



I Unidentified species 

 1 



Crustaeea 

 Hyalella knickerbockerl (Bate) I Hyalella knickerbockeri (Bate) 



I 1 

 Other inseets than midges 



Caddis larva (Leptoceridae) 



Corlxld nymph 

 2 



Total 28+ 



Hydropsyche sp. 

 1 



Total 24+ 



POLLUTIONAL, MORK TOLERANT, OR DOUBTFUL 



M'orms [Tubificidae and Naididae) 



Limnodrilus hoffmeiateri Clapar^de 



Limnodrilus n. sp. 



Tubifex tubifex (Muller) or var.? 



New genus 



Other unidentified, Immature 



4+ 



At least two unidentified spp. 



Erpobdella punctata (Leidy) 

 Helobdella stagnalls (Linnaeus) 

 Helobdella nepheloidea (Graf) 

 Dina parva Moore 

 4 



Leeches 



Erpobdella punctata (Leidy) 

 Helobdella stagnalis (Linnaeus) 



Pollutional or more tolerajit midges 



Chironomus plumosus Linnaeus, var. 

 Chironomus maturus Johannsen 

 Chironomus plumosus Linnaeus 



Chironomus plumosus Linnaeus 

 Chironomus plumosus Linnaeus, var. 

 Chironomus maturus Johannsen 

 Chironomus frequens Johannsen 



4 



Chironomus digitatus Malloch 

 Tanypus monilis Linnaeus 

 Chironomus sp. or spp. 

 Procladius sp. or spp. 

 Tanypus sp. or spp. 

 5+ 



Midge larvae of doubtful status 



Chironomus crasslcaudatus Malloch 

 Palpomyia longipennis Loew? 

 Chironomus sp. or spp. 



3+ 



Unusually tolerant snails 

 Musculium transversum Say i Musculium transversum Say 



1 I 1 



LESH TOLRRANT GROUP (SNAILS ONLY) 



Lrs.-i tulrrtijit stiails, first group, (upper lake, farthest northward 

 oeCMrrewce, 1922) 



r 



i' -.-nin Prime 

 b^iilidum Anthony 



Pisitliuni compressum Prime 



Pisidium pauperculum, var. crystal- C... 



ense Sterki 

 Campeloma subsolidum Anthony 

 3 



Less tolerant snails, second group, (middle lake, farthest north- 

 ward oecurrence, 1922) 

 Sphaerium stamineum Conrad I Sphaerium stamineum Conrad 



1 I 1 



CUOANER WATER OR LESS TOLERANT ASSOCIATED GROUP 



Mussels 



I Quadrula plicata Say 



1 



Goniobasis livescens Menke 

 1 



Snails 



Goniobasis livescens Menke 

 Pleurocera elevatum, var. lewisii Lea 

 2 



Bryozoa 



Plumatella priuceps, var. fruticosa 



Kraepelin 

 1 



Plumatella princeps, var. fruticosa 



Kraepelin 

 1 



Unidentified species 

 1 



Sponges 



I Unidentified species 

 I 1 



Orustacea 

 Hyalella knickerbockeri (Bate) Hyalella knickerbockerl (Bate) 



1 I 1 



Other insects than midges 

 Caddis larva (Leptoceridae) Hydropsyche sp. 



Corlxid nymph 



2 1 



Total 27+ 



ClIASNEt^ 



1922: 4 stations; 4 cross-flections 



1920: 5 stations; 6 crowMwctUnui 



POIiUTIONAL, MORi; TOLERANT, OB DOUItTFXJI. 



Worms {Tubificidae and Naididae) 



Limnodrilus hoffmeiateri ClaparMe 



Limnodrilus n. sp. 



Unidentified 



3 



At IcaHt 3 unidentified spp. 



3 



Leeches 



Helobdella stagnalis (Linnaeus) 

 Helobdella nepheloidea (Graf) 

 Dina parva Moore 



Pollutional or more tolerant midges 



j Chironomus plumosus Linnaeus 



Chironomus plumosus Linnaeus, var, 

 Chironomus maturus Johannsen 

 Chironomus frequens Johannsen 

 4 



Millar Inrviic nf thtuhfful xinlus 



Chironomus sp. or spp. 



1 



Chironomus sp. or spp. 



Tanypus sp. or spp, 



Chironomus crasslcaudatus Malloch 



3+ 



Unusually tolerant snails 

 Musculium transversum Say [ Musculium transversum Say 



1 ! 1 



LESS TOLERANT GROUP (SNAILS ONLY) 



Less tolerant snails, first group, (upper lake, farthest 7iorthward 

 occurrenee, 1022) 

 Pisidium compressum Prime | Campeloma subsolidum Anthony 



Campeloma subsolidum Anthony 



2 I 1 



Less tolerant snails, second group, (rniddle lake, farthest north- 



ward occurrence, l[i~^) 



— -- j Sphaerium stamineum Conrad 



I 1 



CLEANER WATER OR LESS TOLERANT ASSOC'LiTED GROUP 



Total 22+ 



