TABLE OF CONTENTS 
ANtTOGUCLION eet ra ree rer eve ec el Nettle tet epee noe earelel toratae cieictaretstsicneseresetatsisislerersisisiar 7 
Acknowledgements mer eretitiscelrisiseitreitete stir oeiele cicictoteckelereerrekemictelsrerehheieieyet 8 
Physical Features of the Big Vermilion Basil)... s:ccted sje stalin «alee ole wlsieieisiele vi ejejeie eves 10 
General Biologyofthe Big Vermilion Rivers. 2c)-0 26 -ieleisieicieieie sisiess sv) sive ers aicivicieeis aie 15 
DVAMI ES eho rss ve eA FEN STS SPN peda Slavs Poor os Fa chemreT Oh ole MeHeT esate ele Gs Sichelseenteseiekescie tote 15 
DWVOKTTS Heme ee cine crce ave rateseeaseaciayehe ce Seal att qeeovonssovige rout cucheget <potelarsnercilevercuchelayaue elevate 15 
(Crustacea err en reaver rare erie Lavsis ecetoushe clare ate taree Pichon mre mceeieie tesreltal ots (o/s: wickavatelousveserecers 16 
PACU ATIG ATSCCES ats hevsyeter she vejereralshspstetcv a nel =f etekevevale a=) horetahshahnlaveratetoretare <\sleeie se oleietsse)s) seiete 16 
Ieee WG Py ape soous dosoadeenbomnencosemndcoohomomsopoboaus cueao ed 18 
ishbhaunavoh thesBige Vermilion RIVERS ce eeielcrsioie cle erotei-lale fete soe eiaialstelsreietelstereisie\s) 18 
General Distributioniof the Mollusk:Raunalere cpa cierto yelsieieyessts tsi elele © cleysielee|evole =1e1s10 24 
P.cologicaliViariationcmirrien ce ionctrcrrcci rire ai ersten eere a alsteketelccsisteislateroreysceleterer eats 25 
Comparisonsiwith! Other Raver SyStemSiy sje elie icloie siete viele ele cyeielclotetsietel=' kere sere 28 
Systematic Discussion of them Mollusca ejay <teceterelsia\efoceatel doy stevareiais\cietavarle wheleteter eleieielarei 31 
Won id ae ke acersteltervrcta eres ter overis ences eeicrcd ote lai ate) ray oe ue rales spear stole coxetets /sratoreverecs 31 
QoleninGh os iieGaoocosccdusEepoUdDEEDoodon Ando naosnucdodpsuGTooUduOUOpe sat 58 
JahNNe aE, Co.Gacecomus coonloy Sones AoODEa bd bot oAd ouneOOpO UE NOSONOUUNEOOG 59 
PN IM ICOLIGAG seep erat erctave vote etey arate (6 (2te a Paved stale) crete lor erobei eicre eieleserihel ovelatsr tele asateloiore siassterale le 60 
Witnie nike Su coop voussugooe nnpdoaquoubcooceoDoncebdodd coDoDotoaddoDOdeddT 61 
IAT Gy lid ae ererpets cisvays crate lc temcyere/ehcseiole el isis oer taretcta rey hats) sierehlays este vai lshel sfererezeleielsizevate 63 
Phivsidae esereretcrsleperere eieietetetorereists tie lovore spetctevetal Pate tsieteleroteketetare) kell sieioielelslre/alepelaisis/=<1= 64 
IA Er ay UGE Os Comp HOG Ht cose toaab oUtubdd DEnad SOAUIEEDDemesSe ado nsoncomoncoas 64 
liggiilrvalshas Apes acocorns santos oD ood nsec ddsdee tooneuons anc oD oneoonADoodod 65 
Pollution of the Salt Fork by Sewage and Manufacturing Wastes...............--- 67 
GeneraliNatureiof Stream Poll ton sis jepe tere jele fate re -peyelodelepore o's cleracarerelai erszeroreictcleyeva/aiel 67 
Seware Pollutionsiny the sal tit ork aererseprsckeseic) io akeko er tersieleieierarsteselsta/ehe eisieiereeisrasa/e) 6 72 
Recent Examination of the Polluted Portion of Salt Fork...................-45 80 
Summanysor calt orks Conditions me ysjeretescleieie oie ate stein einera tel sie eielelelsieletelstele eierairl< 88 
Summarysand COnClusiOrs scr cter es-tele ec eyeraretete ai sietelol ole a esola) sicied eters) eine) tersieteteleiayerere =i 90 
Unftavorableylnf wencesscpper elevate ict letate state false tater clench ovate lelciol ocersieretereie/elo|otoval«[or fa 90 
Parasitestand) PathologiciA PeENGleS ice cic acre cl ciciel es eioleiel< cic oleseteicia © * vin clic e/ejeieisie\si sieve 91 
Fl conomici Considerations saiareleieieveleieisieiiseiersi step volerelereletovalcieielsfeleicye\e eis loteleletelelaloie ere 91 
BibMOpraplysaacetes crete siete ere telotel dole oe) etolerelasalelnretelersislatereofelstslais eleteirlsl sicko! s=1={e]ete\s/s/<)01s\e/« 94 
HixplanationvOmblatesercrevyiyer eres ctsvelslale svete loroe svelerolshorersetetel oie characte) eleferels) aia) e\efelaieis! fe 97 
