26 
ZOOLOGY. 
List of specimens. 
Catalogue 
number. 
No. of 
specimens. 
Sex and 
age. 
Locality. 
When 
coliected. 
Collected by— 
Original 
number. 
Nature of spe¬ 
cimens. 
547 
2 
Adult. 
San Francisco, Cal._ 
1856 
Lieut. Trowbridge... 
Alcoholic. 
46. HYSTEROCARPUS TRASKII, Gibbons. 
General Report upon Fishes. 
Body subelliptical in its profile; nape convex; frontal line depressed ; eye circular, of medium 
size ; posterior extremity of maxillary extending to a vertical line drawn in advance of the 
anterior rim of the orbit. In the male the upper regions are dark or purplish brown, unicolor ; 
yellowish olive, spotted with black, on the lower portion of the flanks ; throat and belly golden 
yellow. In the female the back is ash colored, with irregular black patches, approximating 
somewhat to interrupted bands across the sides ; belly lemon yellow. 
List of specimens. 
Catalogue 
number. 
No. of 
specimens. 
Sex and 
age. 
Locality. 
When 
collected. 
Collected by— 
Original 
number. 
Nature of spe¬ 
cimens. 
561 
i 
Adult. 
Fort Reading, Cal... 
Dr. Newberry.. 
Alcoholic. 
562 
2 
Young. 
_do_ 
Dr. Hamm on H 
_do_ 
I 
47. HOLCONOTUS RHODOTERUS, Agass. 
Plate XXXY.— General Report upon Fishes. 
General aspect elongated, neither elliptical nor fusiform. Frontal region subconcave. 
Head subconical; mouth small; posterior extremity of maxillary not quite reaching the ante¬ 
rior rim of the orbit. Eye rather large and circular. Brancliiostegals five. About forty-four 
scales in the lateral line. Bluish grey or olive above ; silvery or yellow upon the sides, with 
rose colored spots disposed in longitudinal series. 
List of specimens . 
Catalogue 
number. 
No. of 
specimens. 
Sex and 
age. 
Locality. 
When 
collected. 
Collected by— 
Original 
number. 
Nature of spe¬ 
cimens. 
569 
i 
Adult. 
Astoria, Oregon_ 
1856 
Lieut. Trowbridge_ 
Alcoholic. 
48. ENNICHTHYS MEGALOPS, Grd. 
Plate XXXYII.— General Report upon Fishes. 
General appearance gibbous. Dorsal sheath very short. Mouth large and oblique. Eyes 
very large, circular. Four rows of scales upon the preopercle. Brancliiostegals six. Eighty- 
