358 chakaciwid^:. 



5. Xiphostoma hujeta. 

 Cuv. 8f Val. xxii. p. 358. 



D. 10. A. 10. 



Snout rather broad and obtuse, curved at its extremity ; the hind 

 part of the dorsal fin is above the origin of the anal. A black, yellow- 

 edged ocellus at the base of the caudal. ( Vol.) 



Maracaibo. 



40. CYNODON. 



Cynodon, Spix, Pise. Bras. p. 76 ; Cuv. fy Val. xxii. p. 323. 



Raphiodon, Agass. in Spix, Pise. Bras. p. 76. 



Hydrolycus et Raphiodon, Mull. Sf Trosck. Hor. Ichth. i. pp. 18, 19. 



Dorsal fin placed behind, or nearly in, the middle of the length of 

 the body, behind the ventrals; anal long. Head and body com- 

 pressed, oblong, the latter covered with very small scales ; belly com- 

 pressed, keeled. Teeth in the intermaxillary, maxillary, and man- 

 dible in a single series, conical, widely set, of unequal size ; a pair 

 of very large canine teeth anteriorly in the lower jaw, received in 

 two grooves on the palate ; palate with patches of minute granulated 

 teeth. Gill-openings very wide, the gill-membranes not united below 

 the throat. The outer branchial arch without gill-rakers, but with 

 very short tubercles. 



Brazil, Guianas. 



a. The dorsal fin is between ventral and anal : Hydrolycus, M. & T. 



1. Cynodon scomberoides. 



Hydrocyon scomberoides, Cuv. Mem. Mus. v. p. 357. pi. 27. fig. 2. 

 Hydrolycus scomberoides, Mull. fy Trosch. Hor. Ichth. i. p. 19. tab. 5. 



fig. 2 (dentition). 

 Oynodon scomberoides, Cuv. fy Val. xxii. p. 324 ; Kner, Denkschr. 



Acad. Wiss. Wien, 1860, xviii. p. 52; Casteln. Anim. AmSr. Sud, 



Poiss. p. 75. pi. 39. fig. 2. 



B. 5. D. 12. A. 33-40. P. 17. V. 9. 



The height of the body is one-fourth or two-sevenths of the total 

 length (without caudal), the length of the head sometimes more and 

 sometimes less than two-ninths. Dorsal fin exactly in the middle 

 between ventrals and anal. Silvery ; humerus blackish. 



Brazil, Guiana. 



a. Adult. British Guiana. Presented by Sir R. Schomburgk. 



b. Half-grown. River Capin. Purchased of Mr. Stevens. 



