90 U. S. p. R. R. EXP. AND SURVEYS — ROUTE TO CALIFORNIA. 



38. TIGOMA CONFORMIS, Grd. 

 Gen. Rep. 289. 



Spec. Char.— Body rather short, subfusifonn in its outlines. Head of moderate development, constituting the fourth of the 

 total length. Mouth rather small, with its gape somewhat oblique ; posterior extremity of maxillar bone extending to a vertical 

 line drawn behind the nostrils. Eye moderate sized ; its diameter entering nearly five times in the length of the side of the head. 

 Isthmus small. Anterior margin of dorsal fin nearer the fork of the caudal than the extremity of the snout. Origin of ventralg 

 nearer the isthmus than the insertion of the caudal. Scales well developed. Purplish brown above ; dark yellowish beneath. 



231. Posa, or 0-co-ya, creek, California. Dr. A. L. Heermann. 



39. TIGOMA CRASSA, Grd. 

 Gen. Rep. 293. Plate LXII. 



Spec. Chae. — Body plump and contracted. Head rather small, constitutiug about the fifth of the total length. Snout short 

 and depressed, rounded off anteriorly. Mouth moderate; posterior extremity of maxillary extending to a vertical line drawn 

 behind the nostrils. Eye small ; its diameter entering six times in the length of the side of the head. Anterior^margin^of 

 dorsal fin equidistant between the extremity of the snout and the fork of the caudal. Origin of ventrals nearer the isthmus than 

 the insertion of the caudal. Pectorals and ventrals small. Scales large. Upper region deep bluish or purplish black, lighter 

 on the sides ; beneath yellow. 



216. Sacramento river, California. Dr. John S. Newberry. 



40. SIBOMA CRASSICAUDA, Grd. 



Gen. Rep. 296. Plate LXIV, Figs. 1—4. 



Spec. Chak. — Body somewhat elongated, rather thick. Peduncle of the tail very stout. Head contained four times and a 

 half in the total length ; its profile is very much inclined, and the snout sub-pyramidal. Posterior extremity of maxillar bone 

 extending to a vertical line drawn midway between the nostrils and the orbit. Eye rather small, sub-circular ; its diameter 

 entering nearly six times in the length of the side of the head. Anterior margin of dorsal fin a little nearer the extremity of the 

 snout than the fork of the caudal. Light purplish brown above ; yellowish beneath. 



235. Rio San Joaciuiu, California. Dr. A. L. Heermann. 



41. CLUPEA MIRABILIS, Grd. 

 Gen. Rep. 229, 



Spec Ciiak. — Body rather short, deepest upon its middle, and tapering towards either extremity. Head constituting the fifth 

 of the length. Posterior extremity of the maxillar bone extending to a vertical line drawn through the pupil. Eye large and 

 sub-circular; its diameter entering about four times in the length of the side of the head. Anterior margin of dorsal fin nearer 

 the insertion of the caudal than the apex of the upper jaw. Base of anal fin comprised about eleven times in the total length ; 

 its anterior margin being nearer the insertion of the caudal than the origin of the ventrals. Origin of ventrals placed somewhat 

 behind the anterior margin of the dorsal, and a little nearer the apex of the lower jaw than the tip of the lower lobe of the caudal. 

 Dorsal region bluish purple; flanks and belly metallic whitish or yellowish. 



949. San Francisco, California. Dr. A. L. Heermann. 



42. MELETTA COERULEA, Grd. 

 Gen. Rep. 230. Plate LXXV, Figs. o—I. (By error on the plate : Figs. 1—3.) 



Spec. Chab. — Body slender, elongated, sub-fusiform in profile. Head constituting more than the fifth of the total length. 

 Posterior extremity of maxillar bone extending to a vertical line drawn through the middle of the orbit. Eye large and sub- 



