40 COPE 



Y, Posttemporal projecting freely from 

 skull. 



First vertebra united by suture to crani- 

 um ; intercalaria united behind su- 

 praoccipital ; basilar pectoral bones 

 elongated; (6) Pedieulati. 



Posterior cephalic region normal; the 

 anterior twisted so as to bring both 

 orbits on one side ; inferior pharyn- 

 geals distinct; (7) Heterosomata. 



Cranium normal, premaxillaries usually 

 coossified with maxillaries behind, 

 and the dentary with the articular; 

 pharyngeal bones distinct ; (8) Plectognathi. 



Cranium normal; bones of jaw dis- 

 tinct; (9) Percomorphi. 



YT, Posttemporal an integral part of the skull. 



Cranium normal; bones of jaws distinct; 



pharyngeals separate; (10) Craniomi. 



The families of the preceding orders are as follows: 

 Opisthomi: Mastacembelidse ; Notacanthidee. 



Pbecesoces: Opheocephalidse; Mugilidse (mullets); Ather- 

 inidse; SphyrEenidse (barracuda); Scombresocidse (soft 

 gar). 



Hemibranchii : Pegasidse; Gasterosteidse (stickle-back); 

 Fistulariidse ; Centriscidse ; Amphisilidse ; Dercetidse. 



LoPHOBRANCHii : Solenostomidse; Syngnathidse (pipe- 

 fishes); Hippocampidee (sea-horses). 



DiscocEPHALi : Echeneididse (remoras). 



Pediculati : Antennariidge ; Lophiidse (fishing frog). 



