FISHES—CYPR1NIDAE-RlCIIARDSONIUS LATERALIS. 
279 
brought alongside the body, their extremities reach nearly the origin of the ventrals. The 
formula of the rays may he thus expressed : 
(Length, 5 inches.) D 2, 11; A 2, 18 + 1 ; C 9, 1, 9, 8, 1, 8 ; V 1, 9 ; P 15. 
(Length, 6 inches.)-2, 21 ;-- 16. 
The scales are of moderate development, somewhat irregular in their outline, with radiating 
furrows upon their posterior half, all being directed backwards. The lateral line is deflexed along 
the abdomen, bringing it much nearer the insertion of the ventrals than the base of the dorsal. 
The color of the dorsal region and upper aspect of the head is dark greyish brown or blackish; 
the sides of the head, the flanks, and the belly, being silvery white. The dorsal, anal, and 
caudal fins are greyish yellow ; the ventrals and pectorals of a light straw or yellowish tint. 
References to the figures .—Plate LX, fig 1, represents Richcirdsonius halteatus, size of life, 
from Fort Vancouver. Fig. 2 is a dorsal scale. Fig. 3, a scale from the lateral line. Fig. 4, 
a scale from the abdominal region. 
List of specimens. 
Catal. 
No. 
Cor’g No. 
of teeth. 
No. of 
spec. 
Age. 
Locality. 
When col¬ 
lected. 
Whence obtained. 
Nature of 
specimen. 
Collected by— 
62 
2669 
i 
Adult. 
Fort Dalles, Oregon. 
1853 
Gov. 1.1. Stevens... 
Alcoholic. 
Dr. Geo. Suckley... 
63 
2670 
i 
. .do.. 
Fort Vancouver, Oregon. 
1853 
2. RICHARDSONIUS LATERALIS, Grd. 
Plate LX, Figs. 5—8. 
Spec. Char. —Head constituting the fifth of the total length. Snout sub-conical; jaws even ; posterior extremity of the 
maxillary extending to a vertical line drawn behind the nostrils. Eye large and circular ; its diameter entering nearly four 
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. Anal fin deeper than long and much shorter than the head. Caudal fin entering four times and a half in 
the total length. Blackish b own above ; metallic yellowish white beneath, with a black streak above the lateral line. Fins 
unicolor. 
Syn. — Richardsonius lateralis, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 202. 
This species is more of an elongated and fusiform aspect than R. halteatus. The head is 
contained about five times in the total length. The pharyngeal teeth are five upon the outer 
row, instead of four. 
The dorsal fin is sub-trapezoid also, higher than long, and somewhat nearer the extremity of 
the snout than the fork of the caudal. The caudal itself is hut moderately furcated. The anal 
is deeper than long, nearly linear upon its external edge; its anterior margin is equidistant 
between the isthmus and the tip of the inferior lobe of the caudal. The ventrals are moderate 
sized, posteriorly suh-truncated, their extremities reaching the vent, whilst their origin is nearly 
equidistant between the extremity of the snout and the insertion of the caudal . The pectorals 
are slender, but do not extend as far as the origin of the ventrals. The formula of the rays is 
as follows: 
D 2, 9 + 1; A 2, 14 + 1 ; C 8, 1, 9, 8, 1, 7 ; V 1, 9 ; P 14. 
The scales are of moderate development, irregular in their outlines, anteriorly sub-truncated 
and posteriorly rounded, exhibiting radiating furrows upon their posterior section only. The 
