ZOOLOGY. 



29 



54. ALGANSEA BICOLOR, Grd. 



General Report upon Fishes. 



Head, mouth, and eye of moderate size ; posterior extremity of maxillary extending to a 

 vertical line drawn across the nostril. The isthmus is narrow. The anterior edge of the insertion 

 of the ventral fins is somewhat in advance of the anterior margin of the dorsal. Scales large. 

 Back and sides of a metallic bluish black tint, intermingled upon the lower half of the flanks 

 with a golden hue ; the inferior region is pure white or yellow. 



List of specimens. 



55. LAYINIA EXILICAUDA, B. & G. 

 PLATE LIV, figs. 1-4. General Report upon Fishes. 



Body very much compressed, deep upon its middle ; peduncle of tail rather slender ; head 

 small ; eye moderate ; posterior extremity of maxillary not reaching the anterior rim of the 

 orbit. Isthmus small. Insertion of ventral fins situated in advance of the anterior margin of 

 the dorsal ; pectorals rather small ; caudal deeply furcated. Reddish brown above, silvery grey 

 on the sides, the scales being minutely dotted upon their margin ; beneath yellowish. 



The &quot;Herring&quot; of the California fishermen. 



List of specimens. 



56. TIGOMA BICOLOR, Grd. 



General Report upon Fishes. 



Body anteriorly compact, diminishing posteriorly ; head well developed ; mouth large ; pos 

 terior extremity of maxillary extending to a vertical line drawn between the anterior rim of 

 the eye and the nostril ; eye moderate. Origin of ventral fins placed slightly in advance of the 

 anterior margin of the dorsal. Scales large. Dorsal region bluish grey ; sides and belly silvery 

 white, sometimes golden. 



List of specimens. 



