SQUAMIPINNES. 13 



anal fin. Pectoral, soft portions of dorsal, anal, and caudal fins 

 bright yellow. 



Fig. 3. Heniochus macrolepidotus. 



Hob. Throughout the Indian Ocean ; said to attain 18 inches in 

 length. 



4. Genus ZANCLUS, Cuv. & Val. 



Syn. Gnathocentrum, Guich. ; Gonopterus (Gronov.), Gray. 



Branchiostegals four; pseudobranchiae. Body elevated and 

 compressed. Teeth in the jaws ; none on the palate. One dorsal 

 fin with spines, the third of which is very elongate ; anal with 

 three. Scales small. Air-bladder present. Pyloric appendages 

 in moderate numbers. 



Geographical Distribution. Seas of India to the Malay Archi- 

 pelago and beyond. 



743. (1.) Zanclus cornutus. (Fig. 4.) 



Chaetodon cornutus, Linn. Syst. Nat, p. 461. 



Zanclus cornutus, Day, Fish. India, pp. Ill, pi. xxviii, fig. 4, Suppl. 

 p. 780 (see synon.) 



D. 7/40-41. T.19. A. 3/32-34. C. 16. CSBC. pyl. 14. Vert. 9/13. 



Length of head rather more than 3, height of body If in the total 

 length. Eyes diameter SL in length of head, 1 diara. apart, and 

 twice the length of postdrbital portion of head. Fins dorsal 

 spines very elongated and filiform, the last rays very short ; anal 

 much the highest anteriorly : caudal emarginate. Colour yellowish 



