154 
U. S P. R, R. EXP. AND SURVEYS—ZOOLOGY-GENERAL REPORT. 
sub-elliptical, longer than deep, and posteriorly furrowed. The lateral line is nearly straight^ 
presenting but a slight curve, convex upwards, just above the pectoral fin. 
The ground color of the right side is reddish ash with diffused darker spots spread all over 
the body and fins. The left side is pale reddish yellow and unicolor. 
List of specimens. 
Catal. 
No. 
No. of 
spec. 
Sex and 
age. 
Locality. 
When 
collected. 
Whence obtained. 
Nature of 
specimen. 
Collected by— 
698 
5 
Adult.. 
San Francisco, Cal_ 
1853 
Lt. R S. Williamson._ 
Alcoholic. 
699 
3 
Adult.. 
1853 
Lt. A. W. Whipple. 
_do_ 
Dr. C. B. Kennedy.. 
700 
3 
Presidio, Cal_ 
1853 
Lt. W. P. Trowbridge_ 
. do ... 
608 
1 
Adult... 
Port Orford. Oregon_ 
1856 
609 
1 
Adult.. 
Astoria, Oregon___ 
1856 
_do____ 
_do_ 
_do. ___ 
PSETTICHTHYS, Girard. 
Gen. Char. —Eyes large or moderate, situated either on the right or the left side. Interocular spacc’very narrow or moderate. 
.Mouth rather large ; snout bluntly rounded ; jaws sub-equal. Teeth slender and conical, on both sides of the jaws. Origin of 
dorsal fin situated anteriorly to the orbit. Dorsal and anal fins approximating the caudal without being continuous with it. 
Posterior margin of caudal rounded or convex. A small spine in advance of the anal. Surface of the head scaly. Scales 
varying in size, according to the species. Lateral line almost straight anteriorly. 
Svn. — Psettichthys, Grd. in Proc. Acad. Nat. Sc. Philad. VII, 1854, 140. 
The general aspect of this genus is elongated, and reminds us of Solea, which analogy is 
aided by the blunt outline of the head. The eyes and mouth are much larger than in Solea, 
and the presence of teeth on both sides of the jaws exclude all idea of generical affinities 
between these two genera. 
1. PSETTICHTHYS MELANOSTICTUS, Grd. 
Spec. Char.— Body elongated and rather slender. Eyes moderate, situated on the right side ; interocular space moderate. 
Lower jaw somewhat longer than the upper. Posterior extremity of maxillary extending to a vertical line drawn in front of 
the pupil. .Anterior rays of dorsal higher than those immediately succeeding. Dorsal and anal fins even posteriorly. Origin 
of anal fin situated somewhat posteriorly to the base of the pectorals, and provided with a small spine. Scales quite small, 
cycloid in structure ; lateral line very slightly raised above the pectorals. Ground color cinereous, interspersed 'with crowded 
black dots. 
Syn. —Psettichthys melanostictns, Grd. in Proc. Acad. Nat. Sc. Philad. VII, 1854, 140. 
The body is elongated, slender, and tapering posteriorly. Its greatest depth is contained 
about three times in the total length, in which the head enters somewhat less than four times. 
The mouth is large and its gape oblique ; the lower jaw being the longest. The posterior 
extremity of the maxillar bone extends to a vertical line drawn in advance of the pupil. The 
teeth, which occupy both sides of the jaws, are very slender. The eyes, which are well 
developed, occupy the right side ; their horizontal diameter enters four times and a half in the 
length of the side of the head. The interocular space is of moderate width. The origin of 
the dorsal fin takes place opposite the anterior rim of the left or upper eye ; its anterior rays, 
which occupy the declivity of the occiput, are higher than the following ones, which increase 
