APPENDIX TO CHAPTER XVI 253 



d\. Ventral fin, when present, placed 

 on throat or breast ; air-bladder 

 without air tube . . . Anacanthini 



(Codfishes, flatfishes) 



do. Ventral fin, when present, placed 

 ventrally ; air-bladder with air- 

 tube Physostomi 



(Smelt, trouts, whitefishes, catfishes, .suckers, minnows, 

 shads, eels) 



& 2 . Intermaxillaries and maxillaries united with 



each other and with skull . . . Plectognathi 

 Gills small, tuft-like ; body covered with bony 

 plates ........ Lophobranchii 



(Pipe-fishes) 



