ZOOLOGY. 



33 



66. SALAR IRIDEA, Grd. 



Plate LXXIV. — Genei al Report upon Fishes. 



Body subfusiform in profile, otherwise compressed. Head well developed, constituting some- 

 what less than the fourth of the total length. Jaws subequal, posterior extremity of maxillary 

 extending to a vertical line drawn a little beyond the orbit. Anterior margin of dorsal fin 

 equidistant between the extremity of the snout and the insertion of the caudal. Reddish brown 

 above, with numerous and small black spots ; yellowish white beneath. 



The " brook trout" of California. 



67. ARGENTINA PRETIOSA, Grd. 

 Plate LXXV, fig. 6. — General Report upon Fishes. 



Posterior extremity of maxillary extending to a vertical line drawn in advance of the pupil. 

 Eye large and circular, its diameter being contained about four times in the length of the side 

 of the head. Origin of dorsal fin somewhat nearer the extremity of the snout than the tip of 

 the caudal fin, which is forked. The adipose is situated opposite the posterior fourth of the 

 anal. The origin of the ventrals is placed somewhat behind a vertical line drawn at the anterior 

 margin of the dorsal fin. Scales of moderate development. Upper surface of head and back 

 yellowish. Outlines of scales dotted with black. Sides of head and middle of flanks of a 

 shining silvery tint. Lower half of flanks and belly dull yellowish. 



One of the genuine "smelt" tribe. 



List of specimens. 



68. COREGONUS WILLIAMSONI, Grd. 



Plate LXVI. — General Report upon Fishes. 



Head and mouth small ; posterior extremity of the maxillary not extending as far as the an- 

 erior rim of the orbit. Scales large, disposed upon eighteen longitudinal series upon the line 

 of greatest depth, nine above and eight below the lateral line, which is perfectly straight. 

 Color silvery white, with a bluish grey tint over the dorsal region. 

 Williamson's white fish. 

 5 BB 



