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STRIATA 



GEORGEI 



STEWARTI 



HEAD LENGTH IN MM. 



FiQDBB 9. — Regressions of caudal peduncle depth (mm.) on head length (mm.) for three closely related species of 



Argentina. See text for equations. 



single alizarin specimen). The gill rakei-s (fig. 1) 

 are medium-sized, compressed, and widely spaced. 

 The longest gill rakers are equal to one-fifth to 

 one-sixth of the interorbital distance. 



The pectoral fin originates close to the posterior 

 margin of the opercle. The anterior end of the 

 pectoral fin base is elevated from the horizontal 

 by an angle of about 45 degrees ; the distance be- 



tween the innermost rays of the pectoral fins is 

 about equal to or slightly less than the least depth 

 of the caudal peduncle. In almost all of our speci- 

 mens the pectoral and ventral fins are broken off 

 short; however, in a few specimens, the pectorals 

 appear to extend at least half the distance from 

 the pectoral base to the ventral base. The ventral 

 fins are probably shorter. 



24 



U.S. FISH AND WILDLIFE SERVICE 



