IV FISHES OF ILLINOIS 



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The Wabash System Ivi 



Wabash River Ivii 



Vermilion River lviii 



Little Vermilion River lix 



Embarras River lix 



Little Wabash River lx 



Saline River System lxii 



Cache River lxiii 



Big Bay Creek lxiv 



The Lake Michigan Drainage lxv 



On the General and Interior Distribution of Illinois Fishes . . . . lxvii 



The General Distribution lxviii 



The Interior Distribution lxxviii 



The Illinois Basin and the other Districts compared lxxxvi 



Relations of each District to all the others xciii 



The Fishes of Northern, Central, and Southern Illinois xcv 



Use of Locality Maps , xcviii 



Peculiarities of Distribution in the Lower Illinoisan Glaciation xcix 



Classification and Use of Ecological Data cii 



Fishes of the Ohio and of the Mississippi Drainage ciii 



Boundary between Northern and Southern Species cv 



General Features of Ecological Distribution cv 



Ecological Table cix 



General Summary cxiv 



Maps I. -CIII., preceded by list. 



The Fisheries of Illinois cxvii 



Explanation of Terms used cxxii 



Glossary of Technical Terms cxxv 



Key to the Families of Illinois Fishes 1 



Class Marsipobranchii 5 



Order Hyperoartii 5 



Family Petromyzonidae. 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 IS 



Family Polyodontidae. Paddle -fishes 15 



Genus Polyodon Lacepede 16 



P. spathula (Walbaum). Paddle-fish 16 



Order Chondrostei 21 



Family Acipenseridae. Sturgeons , 21 



Genus Acipenser Linnaeus. . . ._ 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 Lepisosteidae. Garpikes 30 



