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U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



2. CLIOLA VELOX, G-rd. 



SPEC. CHAR. Head contained about four times and a half in the total length. Eye large ; its diameter entering three times 

 in the length of the side of the head. Posterior extremity of maxillary not extending quite so far as the anterior rim of the 

 orbit. Anterior margin of dorsal fin somewhat nearer tlie extremity of the snout than the insertion of the caudal. Olivaceous, 

 darker above than beneath ; a black streak along the middle of the flank terminating into a jet black spot at the base of the 

 caudal. A spot at the anterior edge of the dorsal. 



SYN. Cliola velox, GRD. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 192. 



This is a very slender and elegant species, differing from G. vigilax by a more conical head, 

 much larger eyes, and larger scales. The dorsal fin is less elongated, being nearly as high as 

 long. The number of the rays differ but little: 



D 1, 9 ; A 1, 8 ; C 9, 1, 9, 8, 1, 8 ; V 8 ; P 14. 



The ground color is olivaceous, with a silvery reflect over the middle of the flanks ; a black 

 streak follows the course of the lateral line. A jet black spot may be seen at the base of the 

 caudal. A black spot also exists at the anterior margin of the dorsal. 



List of specimens. 



3. CLIOLA VIYAX, Grd. 



SPEC. CHAR. Head contained somewhat over five times in the total length. Eye moderate ; its diameter entering three 

 times and a half in the length of the side of the head. Posterior extremity of maxillar bone not reaching a vertical line drawn 

 in front of the orbit. Anterior margin of dorsal fin nearer the insertion of the caudal than the extremity of the snout. 

 Yellowish with an obsolete greyish streak along the middle of the flanks, and a black spot at the base of the caudal. 



SYN. Cliola vivaz, GRD. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 192. 



This species might easily be mistaken for C. velox, were it not for the shortness of its head 

 and its small eye. Besides, the body is not so much elongated, and is covered with scales a 

 good deal smaller. On the other hand, the shape of the fins, as well as the number of their 

 rays, afford but minor differences. The dorsal appears to be somewhat higher, and the 

 pectorals more slender and more elongated. 



D 1, 9 ; A 1, 8 ; C 6, 1, 9, 8, 1, 7 ; V 8 ; P 12. 



The color is uniform light yellowish or saffron, with a black spot at the base of the caudal 

 fin ; the middle of the flanks exhibit traces of a greyish or blackish streak. 



List of specimens. 



