224 SPOTTED SAW-BELLIED SALMON. 



an inch, and both are armed with strong triangular 

 teeth. The vertebras are stated at thirty-five. 



The Collection possesses two drawings of one 

 fish, which approaches very near to the S. nigri- 

 cans of Spix. The specimen from which the figure 

 in the Brazilian Fishes was made was only four 

 inches and a half long, and the lighter colour may 

 be owing to a younger state. Our drawing, at the 

 same time, shows a fish rather deeper in propor- 

 tion, and there is no anterior dorsal spine repre- 

 sented. Another circumstance of variation occurs 

 in the shape of the pupil, which spirits could not 

 have changed ; in Schomburgk's drawing it is ellip- 

 tical, and it may be worth the while of future 

 observers to attend to the cause of this form. We 

 place the Guiana fishes, for the present, distinct. 



