Jordan and Ever mann. — Fishes of North America. 1687 



regularly arched, but approaching the dorsal outline posteriorly, ceas- 

 ing before reaching end of dorsal. Scales below lateral line regularly 

 arranged, those a))ove irregular. Color in alcohol, uniform gray (prob- 

 ably orange in life) ; scales edged with silvery ; a very faint, narrow, black 

 or dark-blue edge to dorsal anterior to filament ; terminal half of pectoral, 

 \ of caudal, and tips of dorsal aud anal behind and including the falcate 

 lobes yellow; no blue on concavity of dorsal aud anal; lips pale; edge of 

 opercle d^rk blue; a faint indication of a dark blotch in front of dorsal; 

 no blue-black blotch on base of pectoral. This species ditt'ers from Angel- 

 ichthys ciliaris in the form of the body, in color, and especially in the very 

 long spines on the upper limb of preopercle. A single specimen, 9 inches 

 long, from the Galapagos Islands, collected by United States Fish Com- 

 mission steamer Albatross. {lodoKoi, a sheaf of arrows, from the brist- 

 ling ijreopercle. ) 



Holacanthus iodocus, Jordan & Kcttek, in Gilbert, Proc. F. S.Nat. Mus. 1896, 445, Gala- 

 pagos Archipelago (Type, No. 47747, U. S. Nat. Mus. Coll. Albatrosa) ; Joed^vn &, 

 EvEBMANN, Check-List Fishes, 421, 1896; name ouly. 



Family CLXYI. ZANCLID.^. 



(The Mookisii Idols.) 



Body oblong, much compressed and elevated, covered with minute rough 

 scales. Mouth small, with loug, slender, brush like teeth ; no teeth on the 

 palate; bones of top of head thick and solid, developing with age a con- 

 spicuous median horn on the forehead, wanting in the young. Preoi)er- 

 cle unarmed. Dorsal single, with 7 spines, the third and succeeding 

 spines prolonged into long filaments; interspinal bone projecting before 

 dorsal. Anal similar to soft dorsal, loug, with its anterior rays produced; 

 a small antrorse spiuo before anal. Caudal peduncle unarmed, the fin 

 lunate; pectorals short; ventrals pointed. Intestine long. Coracoid 

 bones largely developed. Yertebrte reduced in number, 9 -}- 13 = 22. Air 

 bladder large. Brauchiostegals4; pyloric c;^3ca 14. One species, widely 

 distributed about rocky islands of the Pacific. (Genus Zanclus, Giinther, 

 Cat., II, 492-494, 1860.) 



663. ZANCLUS, Cuvier &, Valenciennes. 



Zanclus (Commerson) Cuvier & Valenciennes, Hist. Nat. Poiss., vu, 102, 1831 (comutus). 



Oonopterus, Gronow, Cat. Fish., Ed. Gray., 77, 1854 (moerens). 



Gnathoccntrum, Guichenot, Ann. Maine et Loire, IX, 4, 1866, (centrognathwn ) ; young. 



Characters of the genus included above. {ZdynXov, a sickle.) 



2103. ZAM'LrS CORXUTUS (Linnseus). 



(Moorish Idol; Besan; Piqoiek; Porte E.vseigne.) 



Head 2? ; depth about as great as length; eye 2\ in snout. D. VII, 38; 

 A. Ill, 33; snout \^ in head, greatly produced, the upper profile very con- 

 cave; horn on forehead well developed, wanting iu young; teeth slender, 

 brush-like, very much projecting. Anterior rays of dorsal and anal pro- 



