30 



ZOOLOGY. 



57. TIGOMA CRASSA, Grd. 

 PLATE LXII. General Report upon Fishes. 



Body plump and contracted. Head rather small ; snout short and rounded ; eye small ; mouth 

 moderate ; posterior extremity of maxillary extending to a vertical line drawn across the posterior 

 rim of the nostril. Pectorals and ventrals small. Scales large. Upper region hluish or 

 purplish black ; sides greyish black ; beneath yellow. 



Known as &quot; chub&quot; amongst the fishermen. 



List of specimens. 



216 



2777 



Adult. Sacramento river, Cal 1855 Dr. Newberry I Alcoholic 



58. CHEONDA OERULEA, Grd. 

 General Report upon Fishes. 



Body subfusiform in profile. Head of moderate development ; snout slender and conical. 

 Mouth rather deeply cleft ; posterior extremity of the maxillary extending to a vertical line 

 drawn across the anterior rim of the orbit. Eye rather large. Isthmus narrow. Fins small. 

 Scales moderate. Upper regions of a greyish azure ; inferior regions of a dull silvery white ; 

 black dots being scattered all over the back, sides, and belly. 



List of specimens. 



59. PTYCHOCHEILUS OREGONENSIS, Grd. 

 General Report upon Fishes. 



Body subfusiform in profile. Head rather small, elongated, slender upon the snout. Mouth 

 deeply cleft ; posterior extremity of the maxillary extending to a vertical line intersecting the 

 anterior rim of the orbit. Eye of moderate development. Pectoral and ventral fins rather 

 small. Back and upper surface of head dark reddish brown ; flanks and belly white, with a 

 silvery tint. 



List of specimens. 



