112 



SPECIAL CONVERGENCE 



by him the mullet offered the most complete 

 instance of this structure, its strong muscular 

 stomach being evidently adapted, like the gizzard 

 of birds, to the two offices of mastication and 

 digestion. The stomach of the gillaroo trout, in 



FlG. II. Parallelism with convergence between two families 

 of fishes, Mugilidas and Clupeidae. 



Hunter's experience, held the second place. But 

 the gizzard of Chatoessus, described above, holds 

 a position of equality with that of the mullet. 



It should be added that Darwin ("Origin of 

 Species," p. 235) referred to the luminous organs 

 of insects of distinct families and diverse topo- 

 graphy as a phenomenon parallel with that of 

 the electric organs of fishes. 



