8 



INSTRUCTION. 



The location of the fins of the fish mark the subdivi- 

 sions of the families. The above diagram being supposed 

 to represent a fish, and a Trout at that, a is the first back 

 or dorsal fin, F the second in the case of this species, 

 mere rayless, fatty matter ; E is the tail fin or caudal 

 the writer, as a married man, naturally avoiding the 



