288 Field Museum of Natural History — Zoology, Vol. VII. 



Fig. 50. Gizzard Shad; Hickory Shad. 



Dorosoma cepedianum (Le Sueur). (After Goode.) 



Color silvery, bluish above, with reddish and brassy reflections; 

 a large dark spot behind opercle, most conspicuous in the young; 

 fins more or less dusky. 



Length usually less than 1 2 inches. 



This species is abundant in the lakes and sluggish streams from the 

 Atlantic and Gulf States to the Mississippi Valley, and southward to 

 Yucatan. 



Family Clupeidse. 

 The Herrings. 



Body oblong or elongate, more or less compressed, covered with 

 cycloid scales; head naked; belly rounded or compressed and ser- 

 rated; no adipose fin; gill membranes free from the isthmus; gill 

 rakers slender; mouth terminal oblique; premaxillaries not pro- 

 tractile; teeth usually small or wanting; air bladder large, with open 

 duct. 



Genus Poiuolobiis Rafinesque. 



Alewives. 



Body rather elongate, compressed; head pointed, mouth terminal, 

 teeth minute; belly sharp-edged, strongly serrated before and behind 

 ventrals; dorsal fin nearly median, its last ray not produced. 



Pomolobus chrysochloris Rafinesque. Golden Shad; Skipjack; 

 Blue Herring. 

 Head 3.7 to 4.3; depth 3.6 to 4.3; D. 16; A. 18; scales 52 to 54. 



