ZOOLOGY. 



27 



five scales in lateral line. Ash or greyish brown above. Sides and belly dull yellow or white. 

 A diffused spot upon the anterior third of the anal. Other fins yellowish. Tip of pectorals 

 blackish or deep purple. 



List of specimens. 



XVI. FAMILY CYPKINIDAE. 



49. MYLOCHEILUS CAURINUS, Grd. 

 Plate XL VI, figs. 1-4. — General Report upon Fishes. 



Snout rounded and subcorneal, though rather blunt. Posterior, extremity of maxillary ex- 

 tending to a vertical line drawn across the posterior rim of the nostril. Anterior basal edge of 

 ventrals situated opposite the third developed ray of the dorsal. Brownish black above ; yel- 

 lowish gold beneath ; two lateral darker bands, the inferior one extending no further back 

 than the vent. 



" Columbia river Dace." 



List of specimens. 



50. MYLOPHARODON ROBUSTUS, Ayres. 

 Plate XL VII. — General Report upon Fishes. 



Upper surface of head very declivous ; snout tapering, almost wedge shaped. Posterior ex- 

 tremity of maxillary extending to a vertical line drawn across the anterior rim of the orbit. 

 Eye of medium size. Pectoral and ventral fins broad and stout. Anal fin nearly as large as 

 the dorsal. Ground color olivaceous, darker above than below. 



Sold in the markets of San Francisco under the name of "Salmon Trout." 



List of specimens. 



