THE LIMBS OF FISHES. 



39 



Among the Ganoid fishes, the fins of PolyjHerus are, fun- 

 damentally, like those of the Elasmobranchii ; bnt the pro- 

 pterygial, mesopterygial, and metapterygial basalia, are 

 more or less ossified, and are succeeded by a series of elon- 

 gated radialia, which are also, for the most part, ossified. 

 Beyond these follow some small additional radialia, which 



Fig. 15. — The right pectoral member of the Monkfish (Sgaa^wa) : h, 

 propterygium ; »fls, mesopterygium ; ?n<, metapterygium. 



remain cartilaginovis, and are embraced by the bases of the 

 fin-rays. In the other Ganoids the propterygial basale dis- 

 appears, and some of the radialia, pushing themselves be- 

 tween the mesopterygial and metapterygial basalia, articu- 

 late directly with the pectoral arch. The mesopterygial 



