ZOOLOGY-FISHES 
89 
Insertion of ventrals nearer the extremity of the snout than the base of the caudal. Scales moderate. Greenish brown above ; 
yellowish or whitish beneath, sometimes with small scattered black spots. Fins greyish olive. 
196. Mercede river, California. Dr. A. L. Heermann. 
197. Mohave river, California. Dr. A. L. Heermann. 
34. LAVINIA EXILICAUDA, B. & G-. 
Gen. Rep. 241. Plate LIY, Figs. 1—4. 
Spec. Char. —Body very compressed, quite 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. 
207. Sacramento river, California. Dr. A. L. Heermann. 
208. Posa creek, California. Dr. A. L Heermann. 
35. POGONICHTHYS INAEQUILOBUS, B. & G. 
Gen. Rep. 245. Plate LVI, Figs. 1—4. 
Spec. Char.— Head forming a little less than the fifth of the total length; snout rounded, sub-conical, thickish; gape of 
mouth nearly horizontal; lower jaw shorter than the upper. Posterior extremity of inaxillar bone scarcely even with a vertical 
jine drawn in front of the orbit. Anterior margin of dorsal fin somewhat nearer the extremity of the snout than the insertion 
of the caudal. Insertion of ventrals placed posteriorly to the anterior margin of the dorsal; their origin being nearly equidistant 
between the extremity of the snout and the base of the caudal. Lobes of the caudal fin unequally developed ; upper one the 
longest. Greyish brown above ; yellowish beneath. 
182. San Joaquin river, California. Dr. A. L. Heermann. 
36. POGONICHTHYS SYMMETRICUS, B. & G. 
Gen. Rep. 246. 
Sped. Char. —Head constituting the fifth of the total length. Snout rounded and sub-coni al. Gape of mouth somewhat 
arched; lower jaw shorter than the upper. Posterior extremity of the maxillary corresponding to a vertical line drawn behind 
the nostrils. Anterior margin of dorsal fin nearer the insertion of the caudal than the extremity of the snout. Insertion of 
ventrals placed in advance of the anterior margin of the dorsal, and somewhat nearer the insertion of the caudal than the tip 
of the snout. Lobes of caudal fin equally developed. Dark greyish brown or blackish above ; yellowish golden beneath. 
191. Fort Miller, San Joaquin valley, California.—Dr. A. L. Heermann. 
37. LUX1LUS OCCIDENT ALLS, Grd. 
Gen. Rep. 280. 
Spec. Char —Body rather elongated, sub-fusiform in its outliue. Head constituting about the fifth of the total length. 
Snout sub-conical, rather tapering. Gape of the mouth oblique. Posterior extremity of maxillar bone extending to a vertical 
line which would intersect the hind nostril. Eye large and circular; its diameter entering four times iu the length of the side 
of the head. Anterior margin of dorsal fin nearer the insertion of the caudal than the extremity of the snout. Origin of 
ventrals nearer the insertion of the caudal than the extremity of the snout. Anterior edge of anal fin equidistant between the 
isthmus and the tip of the lower lobe of the caudal. Dark greyish brown above; yellowish beneath, speckled with grey. 
57. Posa, or O-co-ya, creek, California. Dr. A. L. Heermann.—58 and 59. Four Creeks, 
Tulare valley. Dr. A. L. Heermann. 
12 S 
