IV FISHES OF ILLINOIS 



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The Wabash System Ix 



Wabash River lxi 



Vermilion River lxii 



Little Vermilion River lxiii 



Embarras River lxiv 



Little Wabash River lxv 



Saline River System lxvi 



Cache River lxviii 



Big Bay Creek Ixix 



The Lake Michigan Drainage lxx 



On the General and Interior Distribution of Illinois Fishes lxxii 



The General Distribution lxxiv 



The Interior Distribution lxxxiii 



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 cvii 



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 exxiii 



Explanation of Terms used exxviii 



Glossary of Technical Terms exxxi 



Key to the Families of Illinois Fishes 1 



Class Marsipobranchii 5 



Order Hyperoartii 5 



Family Petromyzonidse. 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 Lacepede 16 



P. spathula (Walbaum). Paddle-fish 16 



Order Chondrostei 21 



Family Acipenseridse. Sturgeons 21 



Genus Acipenser Linnseus 24 



A. rubicundus Le Sueur. Lake Sturgeon 24 



Genus Scaphirhynchus Heckel 26 



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



Genus Parascaphirhynchus Forbes & Richardson 28 



P. albus Forbes & Richardson. White Sturgeon 28 



Order Rhomboganoidea 30 



Family Lepisosteidse. Garpikes 30 



