Ati, Zonks 



1932; 2S stations 



ssaectlons 



POLLOTIONAI, MORE TOLEKANT, OR DOUBTFUI. 



Wormi (,Tuhifici<!ac and Xaididae) 



Limnodrilus hoftmeistori Claparfide 

 Umnocirilus n. sp.* 

 Tubitex tubif« { JluUer) ? or var. 

 Limnoiirilus sp. like L. claparede- 



iauus Ratzel 

 Naidiiiae. iinidentifleil 

 5 



At least 3 or 4 spp., unldpntlfled 



3+ 



Erpobdella punctata (Leidy) 

 Helobdella nepheloidea (Grat) 



Leeches 



One unidentified species 



PolUitional or more tolerant midge larvae 



Cliironomus plumosus Linnaeus, var. 



Chironomus plumosus Linnaeus 

 Chironomus decorus Johannsen 

 Tanypus dyari Coquillett 

 3 



Midge larvae of doubtful status 



Chironomus sp. or spp. 

 Procladius sp. or spp. 

 Tanypus sp. or spp. 

 Tanypus monilis Linnaeus 



4+ 



Chironomus sp. or spp. 

 Tsmypus sp. or spp. 



2+ 



Vnusually tolerant snails 

 Musculium transversum Say { Musculium transversum Say 



1 ! 1 



LESS TOLERANT GEOHP (SNAILS ONLY) 



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

 occurrence, 19B2) 

 Musculium truncatum Linsley I Campeloma subsolidum Anthony 



Pisidium compressum Prime 

 Pisidium pauperculum, var. crystal- , 



ense Sterk; 

 Pisidium sp. near complanatum 



Sterki 

 Campeloma subsolidum Anthony 

 6 



CLEANEB WATEE OR LESS TOLEEANT ASSOCLATED GEOUP 



COMPARISON OP SPECIES LISTS; UPPER PEORIA LAKE 

 Wide Waters 



1922: 20 stations: 3 cross-seotlona 1920: B stations; 3 cross-sections 



I'OLLUTIONAX, MORE TOL/CBANT, OK DOUBTFUL 



Worms (Tubiflcidae and Naldidae) 

 Limnodrilus hoffmeisteri ClaparSde | At least 3 unidentined spp. 

 Limnodrilus n. sp. 

 Tublfox tubitex (Miiller)? or var. 

 Limnodrilus sp. like L. claparede- 



ianus Katzel 

 Naididae, unideutified 

 E+ 



Helobdella nepheloidea (Grat) 

 1 



Leeches 



I Unidentified sp. 

 1 



PoUutlonal or more tolerant midge larvae 



Chironomus plumosus Linnaeus, var. 



Chironomus plumosus Linnaeus 

 Chironomus decorus Johannsen 

 Tanypus dyari Coquillett 

 3 



Midge larvae of doubtful status 



Chironomus sp. or spp. 

 Procladius sp. or spp. 

 Tanypus sp. or spp. 

 Tanypus monilis Linnaeus 

 4+ 



Chironomus sp. or spp. 

 Tanypus sp. or spp. 



2 + 



Unusually tolerant snails 

 Musculium transversum Say i Musculium transversum Say 



1 I 1 



LESS TOLERANT GROUP (SNAILS ONLY) 



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

 occun-ence, 1322) 



Musculium truncatum Linsley 

 Pisidium compressum Prime 

 Pisidium pauperculum, var. crysta- 



lense Sterki 

 PlrldlUTH 5p. near complayiRtum 



Sterki 

 Campeloma subsolidum Anthony 

 5 



Campeloma subsolidum Anthony 



CLEANER WA lER OR LESS TOLERANT ASSOCIATED GROUP 



Channel 



1922: 3 stations; 3 cross-sections j 1920: 3 stations; 3 croM-sections 



P0Lr,UTI0NAL, MORB TOLEBAKT, 08 DOUBTFUL 



Worms (Tubificidae and Naididae) 



Limnodrilus hoffmeisteri Claparede 

 Limnodrilus n. sp. 

 Tubifex tubifex (Miiller)? or var. 

 Naididae, unidentified 



4+ 



At least 3 unidentified spp. 



Leeches 



Erpobdella punctata (Leidy) 

 1 







Po!iK(iona( or more tolerant midge larvae 



Chironomus decorus Johannsen 

 Tanypus dyari Coquillett 

 2 



Midge larvae of doubtful status 



Chironomus sp. or spp. 

 Tanypus sp. or spp. 

 2+ 



Unusually tolerant snails 

 Musculium transversum Say i Musculium transversum Say 



1 I 1 



LESS TOLERANT GEOUP ( SNAILS ONLY) 



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

 occurrence, 1922} 

 Musculium truncatum Linsley 

 Pisidium compressum Prime 

 2 



Mxissels 

 



Snails 



CLEANER WATER OR LESS TOLERANT ASSOCLATED GROUP 



I Mussels 

 I 



Snails 



Bryozoa 

 



Sponges 

 



Crustacea 

 



Other insects than inidges 

 



Total S+ 



MHAfc 



Bryozoa 

 



Sponges 

 



Crustacea 

 



Other insects than midges 

 



Total 8+ 



• To be deecrlbed by Profcahor Frank .Smith. 



