KEY TO FAMILIES OF PISCES. 81 



J. Jaws attenuate, forming a long, snipe-like bealc. 



Nemiciitiiyid^, 56. 

 J J. Jaws not attenuate. 



K. Tail tapering into a filament SACCOPiiARYNGiDiE, 54. 



KK. Tail not filamentous. 



M. Maxillaries and premaxillaries distinct ZoARCiDiE, 115. 



MM. Maxillaries and premaxillaries more or less coalescent 



with vomer and palatines. 



AXGUlLLIDiE, 53. 



GG. Body not eel-shaped. 



N. Breast with a sucking disk. 



O. Skin smooth Liparioid^, 109. 



00. Skin tubercular C yclopterid^, 110. 



NN. Breast without sucking disk. 



P. Teeth in each jaw confluent into one. 



Q. Body compressed, rough ORxriAGORisciDyE, 131. 



QQ. Body not compressed, spinous.. Diodontid.^, 130. 

 PP. Teeth in each jaw confluent into two. 



TETRODOXTIDiE, 129. 



PPP. Teeth separate. 



R. Body enveloped in abouybox. ..Ostraciid^, 127. 



RR. Body not mailed Stromateid^, 77. 



CC. Gill membranes free from the isthmus. 



S. Vent at the throat. 

 T. Vertical' fins confluent ; body eel-shaped. 



FlERASFERlDiE, 117. 



TT. Vertical fins separate ; body oblong. 



AMIiLYOPSIDiE, 48. 

 SS. Vent posterior. 



U. Caudal fin wanting ; body naked. 



Tkichiurid^, 73. 

 UU. Caudal fin present. 

 V. Upper jaw prolonged into a sword. 



XiPHiiD^, 72. 

 W. Upper jaw not prolonged into a sword. 

 W. Body ovate, much compressed. 



Strojiateid^, 77. 

 WW. Body oblong or elongate. 

 X. Gillmembranes broadly united; teeth 

 present. 

 Y. Dorsal fin of spines only. 



BLENNIIDiE, 112. 



YY. Dorsal fin of soft rays only. 



CONGROGADIDvE, 116. 

 YYY. Dorsal fins 2, anterior spinous, 



posterior soft Cottidje, 107. 



XX. Gill membranes separate. 



Z. Jaws toothless, the lower jaw 

 projecting — Ambiodytid^, 69. 

 ZZ. Jaws with teeth, lower not pro- 

 jecting.... OPHiDiLDiE, 118. 



BuU. Nat. Mus. Ko. 16 6 



