210 PISHES. 



J Marginof upper jaw formed laterally by maxillaries; lateral 



line inconspicuous ; small dusky fishes of muddy brooks ; 



usually a black bar at base of caudal. IjMBKiD^a;, 101. 

 J:): Entire margin of upper jaw formed by intermaxillaries ; 



head depressed ; small fishes of brackish or fresh waters, 



often barred or striped with black. 



CYPBIlSrODONTrD.ffl!, 100. 



FAMILIES OP ISOSPONDTLI. 

 * Body entirely scaleless ; deep sea fishes. 

 f No adipose fln; throat with a long barbel; pectorals rudi- 

 mentary Stomiatidm, the Stomiatoids. 



ff An adipose fln ; no barbel ; belly with phosphorescent spots. 



Scopelidce, the Scopelids. 

 ** Body scaly; head naked; scales sometimes small and imbedded, 

 sometimes large and deciduous. 

 X An adipose dorsal fin ; belly rounded. 

 a. Margin of upper jaws formed by intermaxillaries alone. 

 6. Scales cycloid ; deep sea fishes. 



Synodontidce, the Bynodonts. 

 66. Scales ctenoid ; fresh water fishes ; no teeth on vomer or 



palate Pbbcopsid^, 104. 



aa. Lateral margins of upper jaw formed by maxillaries; 



scales cycloid ; in all waters. . Salmonid^, 105. 



XX No adipose dorsal; lateral margin of upper jaw formed by 



maxillaries which are usually composed of three pieces; 



scales rather large. 



e. Abdomen compressed to an edge which is serrated ; lateral 



line obsolete ; teeth very small or wanting; in all waters. 



Clopeid^, 107. 



ec. Abdomen compressed but not serrated; jaws, vomer and 

 tongue with strong teeth; scales large, silvery; body 

 compressed ; lateral line well developed ; fresh water. 



HYODONTID.a!, 106. 



ece. Abdomen rounded ; teeth various ; marine. 

 d. Upper jaw longest. 

 e. Lower jaw toothless; sides with bright silvery band. 



MnqrwuUdm, the Anchovies. 



