PISHES — CYPRINIDAE-TIGOMA BICOLOR. 
289 
1. TIGOMA CONFORMIS, Gnl. 
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. 
Svn. — Lavinia conformis, B. & G. in Proc. Acad. Nat. Sc. Philad. VII, 1854, 137. 
Tigoma conformis, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 206. 
Only one specimen of tliis species was obtained ; its total length being about four inches. It 
has a quite compact tail. The general appearance of the fish is suggestive of Lavinia crassi- 
cauda ; the body is deeper and proportionally less elongated ; the eye much smaller, and the 
scales larger. Another distinctive mark between these two fishes consists in the position of the 
ventrals, the insertion of which, in T. conformis , is situated in advance of the anterior margin 
of dorsal, whilst it is placed slightly behind it in Lavinia crassicauda. 
The dorsal fin is higher than long ; its upper edge being sub-convex. The anal, which is 
likewise deeper than long, is sub-truncated or slightly convex upon its external edge; its 
anterior margin is somewhat nearer the isthmus than the tip of the inferior lobe of the caudal. 
The ventrals are small, suh-ovate, posteriorly rounded off, and reaching the anal orifice. The 
pectorals are likewise small and suh-ovate in their outlines, their extremities not extending as 
far as the origin of the ventrals. 
D 1, 8 + 1; A 2, 9 ; C 7, 1, 9, 9, 1, 8 ; V 1, 8 ; P 16. 
The scales are well developed, smaller on the dorsal region than along the sides, and smaller 
still on the belly than on the hack. They are somewhat deeper than long, anteriorly sub¬ 
truncated and rounded upon the remaining edges, with radiating furrows upon their posterior 
section only. The lateral line is deflexed upon the middle of the flanks and nearer the insertion 
of the ventrals than the base of the dorsal. 
The upper region of the head and body is dark purplish brown, lighter on the sides, and dark 
yellowish beneath, with metallic reflects. The fins are somewhat greyish yellow, the vertical 
being darker than the horizontal ones. 
List of specimens. 
Catal. 
No. 
Cor’g No. 
of teeth. 
No. of 
spec. 
Locality. 
When col¬ 
lected. 
Whence obtained 
Nature of 
specimens. 
Collected by— 
231 
2785 
i 
Pose or O-co-ya creek, 
Tulare valley, Cal. 
1853 
Lt. R. S. Williamson. 
Alcoholic. 
Dr. A. L. Heermann. 
2. TIGOMA BICOLOR, Grd. 
Spec. Char. —Body elongated, anteriorly compact, diminishing posteriorly. Head well developed, constituting somewhat 
less than the fourth of the total length Mouth large ; posterior extremity of maxillary extending to a vertical line drawn at 
the anterior rim of the orbit. Eye moderate ; its diameter entering six times in the length of the side of the head. Origin of 
ventral fins placed slightly in advance of the anterior margin of the dorsal, which is nearer the insertion of the caudal than the 
extremity of the snout. Scales large. Dorsal region bluish grey ; sides and belly silvery white, sometimes golden. 
Syn .—Tigoma bicolor, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 206. 
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