HOKSE-MACKERELS. 449 



Zanclus. — Body much compressed and elevated. One dorsal, 

 with seven spines, the third of which is very elongate. No teeth 

 on the palate. Scales minute, velvety. 



One species {Z. cornutus), which is extremely common in 

 the Indo-Pacific. It is easily recognised by its snout, which 

 is produced like that of Chchnon, and by the broad black 

 bands crossing the yellow ground-colour. It attains to a 

 length of eight inches, and undergoes during growth similar 

 changes as Acanthurus. 



Anomalops. — Body oblong, covered with small, rough scales. 

 Snout very short, convex, with Avide cleft of the mouth. Eyes 

 very large ; below the eye, in a cavity of the infraorbital ring, 

 there is a glandular phosphorescent organ. Villiform teeth in 

 the jaws and on the palatine bones, none on the vomer. First 

 dorsal fin short, with a few feeble spines connected by membrane. 



This genus, of which one species only is known (A. palpe- 

 Iratus), represents the family of Horse-Mackerels in the 

 depths of the sea ; but we do not know, at present, at what 

 depth it lives. Only six specimens have been obtained 

 liitherto from the vicinity of Amboyna, the Fidji, and Paumotu 

 Islands ; the largest was twelve inches long, 



Capros. — Body compressed and elevated. Mouth very pro- 

 tractile. Scales rather small, spiny. First dorsal with nine spines, 

 anal with three. Ventral fins well developed. Minute teeth 

 in the jaws and on the vomer ; none on the palatine bones. 



The " Boar-fish " {C. apcr) is common in the Mediterranean, 

 and not rarely found on the south coast of England. 



Allied are Antigonia and Dirdmus, known from a few 

 individuals obtained at Madeira and Barbadoes ; they are 

 probably fishes which but rarely come to the surface. 



Equula. — Body more or less compressed, elevated or oblong, 

 covered with small, deciduous, cycloid scales. Mouth very pro- 

 tractile. Minute teeth in the jaws ; none on the palate. One 

 dorsal. Formula of the fins : D. yf j-^, A. ^t^ ^- V^- The 

 lower prseopercular margin serrated. 



2g 



