11 



Kara. Percida. Example, Perch. 

 Sclrrogmtda. Gurnard. 



Order VI. PLECTOGNATHI. 



Endo-keleton partially ossified ; exo-skeleton M ganoid scales or spinet ; maxillarirs and prrmaxil 

 lrirs fixed together ; swim-bladder without air-duct. 



Fara. Balistidn. Example, File-fish. 

 Os/racionida. Trunk-fish. 

 GyntHodontida. Globe-fish. 



Order VII. LOPHOBRANCHII. 



Endo-skele ton partially ossified ; exo-skeleton ganoid ; gill* tufted ; opercular aperture small ; swim- 

 bUui<lrr without air-duct. 



Faru. Ifippocampida. Example, Sea-horse. 

 Syngnathida. Pipe-fish. 



Order VIII. GANOIDEI. 



Endo-<keleton, in some oaseous, in some cartilaginous, in some partly osseous partly cartilaginous ; 

 exo-keleton ganoid ; fins usually with the first ray a strong spine ; heterocercal ; a swim-bladder and 

 air-duct ; intestine with a spiral ralre in most. 



/ Lepidosteus. 

 ram. Salamandroiaa. Examples,! 



I Polypterus. 



/Sturgeon. 

 



I Paddle-fish. 



Order IX. PROTOPTERI. 



Endo-skeleton partly osseous partly cartilaginous ; exo-skeleton as cycloid scales ; pectorals and ren- 

 trals as flexible filaments ; gills filamentary, free ; no pancreas ; swim-bladder as a double lung, with 

 an air-duct ; intestine with a spiral valve. 



Fam. Sirenoida. Example, Lepidosiren. 



c2 



