36 David Starr Jordan 



of Chili and Patagonia. In these two genera the numbers 

 are materially increased, as would be expected if the rule is to 

 hold good. There are, however, other Serranidce , more or 

 less perfectly confined to the iresh waters, and yet retaining 

 the normal number of vertebrae These are perhaps compar- 

 atively recent immigrants from the sea. In evidence of this 

 is the fact that among these forms there is a perfect gradation 

 in habits from the strictly marine,* through migratoryj and 

 brackish-water speciesj to those confined to the rivers and 

 lakes. § 



Jordan & Fesler, 1893. || — In ^ discussion of the sparoid 

 fishes by Jordan & Fesler, reference is made to the fact that 

 the subfamily Aplodadyliyia inhabiting the south temperate 

 zone differ from the other Sparida in the increased numbers 

 of their vertebrae (34 instead of 24) and in the greater numbers 

 of the rays of the dorsal fin. In most other regards, this sub- 

 family closel}' approaches the subfamily Girelliniz of the 

 tropics. 



Jordan, 1891. — In a paper entitled "Relations of Tempera- 

 ture to Vertebrae among Fishes," (Proc.U. S. Nat. Mus. 1891. 

 pp. 107-120, I have given a statement of what is known of 

 this subject, this paper serving as a basis for the present 

 treatise. 



* Dicentrarchus pundatus . ^ Roccus lineatus. 



XMorone americana. \ Roccus chrysops. 



II A Review of the Sparoid Fishes of America and Europe, by David 

 Starr Jordan and Bert Fesler, in the Rept. U. S. Fish. Com. published 

 1893- 



Pai^o Ai,to, California, 

 June 15, 1893. 



