90 
U. S. P. R. R. EXP. AND SURVEYS—ROUTE TO CALIFORNIA. 
38. TIGOMA CONFORMIS, G r d . 
Gen. Rep. 289. 
Spec. Char. —Body rather short, sub-fusiform 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 ventrals 
nearer the isthmus than the insertion of the caudal. Scales well developed. Purplish brown above; dark yellowish beneath. 
231. Posa, or O-co-ya, creek, California. Dr. A. L. Heermann. 
39. TIGOMA CRASSA, Grd. 
Gen. Rep. 293. Plate LXII. 
Spec. Char. —Body plump and contracted. Head rather small, constituting 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. Char. —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 Joaquin, California. Dr. A. L. Heermann. 
41. CLUPEA MIRABILIS, Grd. 
Gen. Rep. 229. 
Spec. Char. —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 LXXY, Figs. 5 — 7. (By error on the plate : Figs. 1—3.) 
Spec. Char.— 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- 
