FISHES — CYPRINIDAE — CHEONDA COERULA. 



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The anterior margin of the dorsal fin is nearer the extremity of the snout than the fork of 

 the caudal fin ; its upper edge is nearly linear. The anal fin is somewhat larger than the 

 dorsal, sub-truncated upon its external edge ; its anterior margin being nearer the tip of the 

 inferior lobe of the caudal than the isthmus ; its base entering about eight times in the total 

 length. The caudal fin is nearly as long as the head. The ventrals are broad when expanded, 

 posteriorly sub-truncated or sub-convex, and, when directed backwards, their extremities do not 

 quite reach the anal aperture. The origin of these fins is a little nearer the extremity of the 

 snout than the insertion of the caudal. The pectorals are elongated, sub-lanceolated or sub- 

 ovate, although their extremities do not extend as far as the origin of the ventrals. 

 D 2, 9 + 1 ; A 2, 11 -f- 1 ; C 7, 1, 9, 8, 1, 8 ; V 1, 9 ; P 16. 



The scales are sub-circular, rather deeper than long, with radiating furrows upon their 

 posterior section only. The lateral line is nearer the ventral than the dorsal outline. 



The upper region of the head and body is reddish grey, whilst the sides and belly are 

 yellowish white, with a metallic reflect over the entire body. The fins are unicolor, the inferior 

 ones being more of a yellow tint than the dorsal and the caudal, which are greyish olive. 



References to the figures. — Plate LXIII, fig. 1, represents Cheonda cooperi, size of life. Fig. 2 

 is the head from beneath, exhibiting the outline of the mouth. Fig. 3, a dorsal scale. Fig. 4, 

 a scale from the lateral line. Fig. 5, a scale from the abdominal region. 



List of specimens. 



2. CHEONDA COERULEA, Grd. 



Spec Char. — Body elongated, sub-fusibrm in profile. Head contained four times and a half in the total length. Snout 

 slender and conical. Jaws sub-equal ; posterior extremity of the maxillary extending to a vertical line drawn across the anterior 

 rim of the orbit. Eye rather large ; its diameter entering five times in the length of the side of the head. Fins small. Upper 

 regions of a greyish azure ; inferior regions dull silvery white ; black dots being scattered all over the back, sides, and belly. 



Sjii.— Cheonda coerulea, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 207. 



This may readily be distinguished from its congener, the preceding species, by the presence of 

 much smaller fins ; the anal is a good deal smaller than the dorsal, and the ventrals are situated 

 somewhat less anteriorly with reference to the dorsal. The anterior margin of the dorsal is 

 nearer the extremity of the snout than the fork of the caudal, precisely as in C. cooperi ; its 

 upper edge is likewise nearly linear. The position of the anal fin is the same as in the species 

 just alluded to ; its base, however, enters fourteen times in the total length, instead of eight, 

 and its inferior edge is sub-concave. The caudal fin is shorter than the head. The insertion of 

 the ventrals is equidistant between the extremity of the snout and the last scales on the base 

 of the caudal ; their posterior edge is sub-truncated or convex, and their tips do not extend as 

 far as the vent. The pectorals are sub-lanceolated and rather slender in appearance. 

 D 2, 9 + 1 ; A 2, 8 + 1 ; C 5, 1, 9, 8, 1, 6 ; V 1, 10 ; P 17. 



