14 BULLETIN OF THE BUREAU OF FISHERIES 



Key F — Continued 



9. Eyes large; mouth large and very oblique Silverside family key, p. 178 



Eyes small; mouth very small and longitudinal Mullet, p. 182 



10. Caudal peduncle extremely slender; caudal fin deeply forked 



Pompano family (in part) key, p. 229 



Caudal peduncle moderately deep; caudal fin at most moderately forked 11 



11. First (spiny) dorsal fin much lower than second (soft rayed) dorsal Bluefish, p. 237 



First dorsal as high as second, or higher 12 



12. Second dorsal fin not much longer than anal Sea-bass family (in part) key, p. 251 



Second (soft rayed) dorsal about twice as long as anal fin Weakfish family key, p. 269 



Key G 



Bony fishes with snouts of ordinary form, symmetrical tails, bodies not clad in bony plates, caudal fin distinct from the anal, 

 neither canine tusks nor barbels on the top of the snout, and only one dorsal fin which is soft-rayed except that it may com- 

 mence with one short spine (from No. 22, p. 12). There is no adipose fin or flap either in front of the dorsal fin or behind it. 



1. Tail deeply forked 2 



Tail square or rounded 12 



2. The whole of anal fin is behind the dorsal Herring tribe key, p. 90 



Part or all of anal fin in front of rear margin of dorsal 3 



3. Mouth gapes back beyond eye 4 



Mouth does not gape beyond eye 6 



4. Series of phosphorescent spots on each side 5 



No phosphorescent spots or organs Anchovy, p. 124 



5. Eye very large Lanternfish family, p. 149 



Eye very small Cyclothone, p. 153. 



6. Eel-like in form . Launce, p. 183 



Not eel-like in form 7 



7. Large ventral fins 8 



Ventral fins wanting or very minute 10 



8. Front portion of dorsal fin very high; body very deep Opah, p. 242 



Dorsal fin not very high, tapers slightly from front to rear; general form slender, only 



about one-fifth as deep as long Pilotfish, p. 229 



10. First dorsal rays very elongate with tiny ventral fins; deep and compressed in 



form Lookdown (adult) , p. 236 



First dorsal ray not elongate 11 



11. Dorsal profile of head convex; forward portion of dorsal fin at least three times as high 



as rear part, narrowing abruptly; no ventral fins Butterfish family key, p. 245 



Dorsal profile of head concave; dorsal fin tapers only slightly from front to rear; 

 minute ventral fins Moonfish, p. 235 



12. Dorsal fin preceded by one or more stout, isolated spines, with or without triangular 



fin membranes 13 



No isolated spines in front of dorsal fin 15 



13. Only one stout dorsal spine, situated over the eye; body very deep 



Filefish family key, p. 294 



Several dorsal spines, all far behind the eye 14 



14. Ventrals large, of ordinary form; caudal peduncle stout Barrelfish, p. 243 



Each ventral consists of one very large stout spine, with or without a small fin 



membrane and one or two short weak rays; caudal peduncle very slender 

 Stickleback family key, p. 166 



