FISHES — CYPRINIDAE — ALGANSEA FORMOSA. 



239 



The back and sides are of a metallic bluish black, intermingled on the lower half of the flank 

 with a golden hue. The inferior surface is white, contrasting with the color of the back. The 

 base of the fins is bluish grey, whilst their periphery exhibits an olivaceous tint. 



List of specimens. 



2. ALGANSEA OBESA, Grd. 



Spec. Char. — Head contained four times and a half in the total length. Eye rather small; its diameter entering nearly six 

 times in the length of the side of the head. Posterior extremity of the maxillar bone corresponding to a vertical line drawn 

 behind the nostrils. Anterior margin of the dorsal fin nearer the insertion of the caudal than the extremity of the snout. 

 Insertion of ventrals nearer the base of the caudal than the extremity of the snout. Scales moderate, Bluish grey above ; 

 yellowish beneath ; sides greyish. Fins greyish olive. 



Syn. — Algamm olesa, Grd. in Proc. Acad. Nat. So. Philad. VIII, 1856, 183. 



This is a very corpulent sj^ecies, covered with scales of moderate development, and so far, the 

 smallest in the genus. The depth is contained about three times in the length, the caudal fin 

 excluded. There are eight longitudinal rows of scales between the origin of the ventrals and 

 the lateral line, and fourteen rows above it to the anterior margin of the dorsal : in all tweutv- 

 three rows. The scales themselves are either somewhat longer than deep, or else as deep as 

 long, anteriorly sub- truncated, rounded upon the remaining three margins, and provided with 

 radiating furrows upon their posterior section only. The following is the formula of the fins : 



D 2, 9 ; A 2, 8 ; C 7, 1, 9, 8, 1, 6 ; V 9 ; P 16. 



The color of the dorsal region is of a bluish grey ; the sides being greyish, whilst the abdomen 

 is yellowish. The fins are greyish olive, darker at their base than upon their periphery. 



List of specimens. 



3. ALGANSEA FORMOSA, Grd. 



Spec. Char. — Head contained four times in the total length. Eye moderate sized ; its diameter entering five times in the 

 length of the side of the head. Posterior extremity of the maxillar bone corresponding to a vertical line drawn behind the 

 nostrils. Anterior margin of dorsal fin equidistant between the extremity of the snout and the insertion of the caudal. 

 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. 



Syn. — Alf/ansea formosa, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 183. 



A very graceful and well proportioned fish as regards body and head. The latter is rather 

 slender and conical, constituting the fourth of the total length, in which the greatest depth 



