4G4 MUGILID.E. 



caudal fin, above the tenth scale of the lateral line; its anterior spines 

 are rather strong, their length being a little more than one-half of 

 that of the head. The soft dorsal is a little higher than the spinous, 

 not scaly, and commences above the twenty-fourth scale, or above the 

 fourth soft anal ray. Caudal tin emarginate. The anal fin is Some- 

 what higher than the dorsal opposite, having feeble spines, the an- 

 terior being quite rudimentary. The pectoral is inserted above the 

 middle of the depth of the body, and equal in length to the distance 

 of the nostril from the posterior margin of the operculum ; it extends 

 nearly to the tenth scale. 



Back greyish-green, each scale with a brown margin ; a silvery band 

 from the base of the pectoral to the caudal fin ; lower parts silvery ; 

 Dase of the pectoral blackish. 



This species is so closely allied to Agonosfoma telfalrii from the 

 Mauritius, that it requires a minute examination to distinguish them. 

 The snout of the American species is comparatively shorter and the 

 spinous dorsal fin is situated more forwards. 



The fish was discovered by Mr. Owen, who, in company with 

 Messrs. Salvin and Godman, is at present engaged in investigating 

 the natural productions of Guatemala. 



7. Agonostoma monticola. 



Mugil monticola, {Bancroft) Griff. Anim. Kim/d. Fishes, p. 3G7. pi. 30. 

 Dajaus monticola, Cziv. 8f Val. xi. p. 164. pi. 316. 

 Mugil irretitus, Gosse, Nat. S(>j. Jamaica, p. 84. 



D. 4 1 i.. A. J. L. lat. 40-42. L. transv. 12. 



Small teeth in the jaws, on the vomer and the palatine bones. 

 The height of the body is contained four times and a third to four 

 times and a half in the total length. Upper lip thin. The maxillary 

 extends to the vertical from the anterior margin of the eye. The 

 interorbital space is convex. The anterior dorsal commences some- 

 what nearer to the snout than to the base of the caudal fin. 



Fresh waters of the West Indies and of Mexico. 

 «. Adult. Barbadoes. Purchased of Mr, Cuming. 

 b-e. Half-grown : skins. Jamaica. From Dr. rarnell's Collection. 

 f. Young, Bluefields, Jamaica. From Mr. Gosse's Collection, and 



type of his Mugil irretitus. 

 g-Ji. Adult : stuffed. West Indies. 

 i. Half-gro^vn. Mexico. Froni M. Salle's Collection. 

 k-n. Adult. 



8. Agonostoma percoides. 



D. 4 I ±. A. -. L. lat. 40-42. L. transv. 13. 



Villiform teeth in the jaws, on the vomer and the palatine bones. 

 The height of the body is contained four times and a third to four 

 times and a half in the total length. Upper lip thin. The max- 

 illary extends beyond the vortical from the anterior mnrgiii of the 

 eye. The interorbital space is flat. The anterior dorsal commences 

 midway between the snout and tlie base of the caudal fin. 



