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CALIFORNIA ACADEMY OF SCIENCES 



lower sharply defined below by the silvery of the sides, passing gradually above into dusky silvery. 

 The upper band is uniform in color and joins its fellow of the opposite side, forming a well defined 

 median band on back as viewed from above. Dorsal spines and anterior part of soft dorsal blackish; 

 anal slightly dusky anteriorly, its spines white. Ventrals white; pectoral dusky on inner face, growing 

 darker towards base. Upper and lower edges of caudal dusky; the upper the darker. 



A single sj^eciraen, 22 cm. in entire length, was taken in the Panama market. 



Measurements in Hundredths of Length 'without Caudal. 



Length without caudal 



Head 



Depth 



Eye 



Maxillary 



Snout to posterior edge of eye 



Snout to soft dorsal 



Snout to anal . . . 



Length of pectoral 



Length of caudal 



Length of longest anterior dorsal ray 

 Length of longest anterior anal ray.. 



Number of dorsal rays 



Number of anal rays .-. . . 



Number of gill-rakers 



203 



2ii 



22 

 5 

 9\ 



II 



49 

 51 



18 



^ 



7 



v-i, 20 

 11-1,19 



6+17 



134. Oligoplites mundus Jordan Jk StarJcs. 



In the Panama market this species is more abundant than any other of the 

 genus. 



0. mundus resembles 0. alius, and differs from ihal division of the genus to 

 which 0. saurus and 0. refulgens belong in having the top of its head and nape 

 closely covered with pores, which open into short canals ramifying beneath the skin. 

 In a large specimen from Mazatlan, about IG inches in length, these pores and 

 canals are very conspicuous and extend posteriorly in a patch on side of back to a 

 point above the anterior third of the pectoral fin. 0. mundus and 0. alius have also 

 the anterior branchiostogals connected across the isthmus by a thin, but tough trans- 

 parent membrane. The bands of teeth on the jaws are wider, the body is deeper, 

 and the caudal is longer. 



