264 FISHES. 



no barbels; no adipose fin; lateral line distinct; abdo- 

 men not serrated, compressed; moderate sized teeth on 

 jaws, vomer, sphenoid, hyoid, pterygoid and palatine 

 bones; tongue with large teeth; head short, deep; eye 

 very large; gill openings wide; one pyloric appendage; 

 air bladder simple. A single species, inhabiting our 

 Western Streams and the Great Lakes. 



/. HYODON, LeSueur. MOON EYES. 



1. H. tergisus, LeSueur. MOON EYE. SILVER BASS. 

 TOOTHED HERRING. Depth 3 7 4 in length; head 4f; 

 snout rounded, shorter than the large eye, which is 3^ in 

 head; scales largest on the flanks; pale olivaceous above, 

 sides brilliantly -silvery; D. 3, 12; A. 30; V. 7; lat. 1. 

 59; length 1 foot. Great Lakes and Mississippi Valley 

 abundant; one of our most beautiful fresh water fishes; 

 variable; it has been described under many names. 



FAMILY CVIL CLUPEID^E. 



(The Herrings.) 



Body scaly; head naked; abdomen compressed to an 

 edge and sharply serrated; margin of upper jaw formed 

 by intermaxillaries mesially and maxillaries laterally; 

 maxillaries composed of three pieces which are some- 

 times movable; teeth usually minute or wanting ; dorsal 

 moderate; anal often very long; scales usually large and 

 loose; no lateral line; gills well developed; posterior 

 part of tongue usually provided on each side with a row 

 of conspicuous " gill rakers " ; gill openings wide. 



In most seas, many species entering fresh water to 

 spawn, a few remaining permanently. As here restricted, 

 there are about twelve genera, and one hundred and 

 twenty species. Many are highly valued as food fishes, 



