374 Evolution and Distribution of Fishes 



Fig. 6i. 



Comparative views of modifications in structure of fins as 

 transition is made from a soft- to a spine-rayed state. Fig. 58- 

 Protoiroctes oxyrhynchus, (after Guenther) ; Fig. s9- P^rcopsts 

 guttatus; FiG. 60. Columbia transmontana ; FiG. 61. Aphredoderus 

 sayanus. (After Jordan). 



