April, 1910. Fishes of Chicago — Meek and Hildebrand. 287 



Fig. 49. Toothed Herring; Mooneye. 



Hiodon tergisus Le Sueur. (After Goode.) 



Family DoroMoniidve. 



The Gizzard Shad. 



Body short and deep, much compressed, covered with thin cycloid 

 scales; head without scales; belly sharp edged, armed with bony 

 serrae; ventral fins abdominal; last ray of dorsal fin much prolonged; 

 gill membranes free from the isthmus; gill rakers slender and very 

 numerous; adipose eyelid present; mouth small; premaxillary not 

 protractile; ma-xillary with a supplemental bone; jaws without teeth, 

 stomach short, muscular, like the gizzard of a fowl. 



Genus Doi'<>H<»iiia Rafinesque. 



Gizzard Shad. 



Body much compressed ; head without scales ; no lateral Une ; last 

 dorsal ray produced into a long filament. 



Dorosoma cepedianum (Le Sueur). Gizzard Shad; Hickory Shad. 



Head 3.7 to 4.3; depth 2.6 to 2.9; D. 12; A. 30 or 31; scales 56 

 to 57. 



Body deep, much compressed; head deep posteriorly, tapering to 

 a rather bluntish snout; mouth small, subinferior, without teeth; in- 

 terorbital space 3.6 to 4.3 in head; diameter of eye 3.4 to 4.8; snout 

 4.9 to 6.1 ; dorsal fin inserted about midway between tip of snout and 

 base of caudal, the last ray elongated, its tip reaching past middle 

 of anal; lateral line absent; ventral scutes 19 + 12 or 13. 



