IV FISHES OF ILLINOIS 



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The Wabash System Ix 



Wabash River Ixi 



Vermilion River Ixii 



Little Vermilion River Ixiii 



Embarras River Ixiv 



Little Wabash River Ixv 



Saline River System Ixvi 



Cache River Ixviii 



Big Bay Creek Ixix 



The Lake Michigan Drainage Ixx 



On the General and Interior Distribution of Illinois Fishes Ixxii 



The General Distribution Ixxiv 



The Interior Distribution Ixxxiii 



The Illinois Basin and the other Districts compared xci 



Relations of each District to all the others xcviii 



The Fishes of Northern, Central, and Southern Illinois c 



Use of Locality Maps ciii 



Peculiarities of Distribution in the Lower Illinoisan Glaciation . civ 



Classification and Use of Ecological Data cyii 



Fishes of the Ohio and of the Mississippi Drainage cviii 



Boundary between Northern and Southern Species ex 



General Features of Ecological Distribution cxi 



Ecological Table cxiv 



General Summary cxix 



The Fisheries of Illinois cxxiii 



Explanation of Terms used cxxviii 



Glossary of Technical Terms cxxxi 



Key to the Families of Illinois Fishes 1 



Class Marsipobranchii 5 



Order Hyperoartii 5 



Family Petromyzonidee. Lampreys 5 



Genus Ichthyomyzon Girard 9 



I. concolor (Kirtland). Silvery Lamprey 9 



Genus Lampetra Gray 11 



L. wilderi Gage. Brook Lamprey 11 



Class Pisces 13 



Order Selachostomi 15 



Family Polyodontidse. Paddle-fishes 15 



Genus Polyodon Lacepde 16 



P. spathula (Walbaum). Paddle-fish 16 



Order Chondrostei 



Family Acipenseridae. Sturgeons 



Genus Acipenser Linnaeus 



A. rubicundus Le Sueur. Lake Sturgeon 



Genus Scaphirhynchus Heckel 26 



S. platorhynchus (Rafinesque). Shovel-nosed Sturgeon 27 



Genus Parascaphirhynchus Forbes & Richardson 28 



P. albus Forbes & Richardson. White Sturgeon 



Order Rhomboganoidea 30 



Family Lepisosteidse. Garpikes 30 



