19. ZANCLTJS. 493 



praeoperculum without spine. Scales minute, rough. Air-bladder 

 present ; branchiostegals four. Pyloric appendages in increased 

 number. 



Indian Ocean and Archipelago ; Polynesia. 



1. Zanclus comutus. 



Renard, i. 13. 76, ii. 9. 44, ii. 16. 75 ; Ruysch, tab. 1. f. 3 ; Valent iii. 



f. 168.456; Seba,\n 'Zb. 6. 

 Chfetodon, Artedi, Sytioii. p. 79. 

 Tetragonopterus, sp., Klein, Miss. iv. tab. 12. f. 2 & 3. 

 Chaetodon comutus, L. Syst. p. 461 ; Bl. tai. 200. f. 2 ; Bl. Schr, p. 221 : 



Lacep. iv. p. 473. pi. 2. f. 1. 

 Zanclus cornutus, Cuv. ^- Val. vii. p. 102. pi. 177 ; Bleeker, Verhand. 



Batav. Genootsch. xxiii. Chcelod. p. 22. 

 Gonopterus moerens, Gronov. Syst. ed. Gray, p. 77. 

 Skeleton : Rosenthal, Ichthyot. Tafeln, tab. 13. f. 3 . Agass. Reclierch. 



Poiss. Foss. iv. tab. G. 



B. 4. D. ^. A. ^. C»c. pylor. 14. Vert. 9/13. 



A pointed horn above each orbit (in adult specimens). The third 

 dorsal spine exceedingly elongate, filiform. Two broad black cross- 

 bands from the dorsal fin to the belly ; caudal black, with the poste- 

 rior margiL. white, crescent-shaped. 



Indian Ocean and Archipelago ; Polynesia. 



a. Very fine specimen. Amboyna. From Mr. Frank's Collection. 

 h. Half-grown. Amboyna. From Mr. Frank's Collection. 



c. Half-grown. Coram. From Madame Ida Pfeiifer's Collection. 



d. Half-grown : stuffed. Sandwich Islands. 



e. Adult : not good state. 

 /. Adult : not good state. 

 g. Adult. 



h. Adult. From the Haslar Collection. 



i, Tc. Half-grown : bad state. From the Haslar Collection, 



I. Half-grown. F^om the Haslar Collection. 



m. Adult. Old Collection. 



n. Adult : discoloured. Old Collection. 



0. Half-grown : skin. From Gronow's Collection. 



p. Adult : skeleton. From the Collection of the Zoological Society. 



The skeleton has been described and figured by several authors ; 

 the anterior and posterior portions of its vertebral column are so 

 shortened in their longitudinal diameter, that, at both extremities, 

 one vertebra has not been developed. 



2. Zanclus canescens. 

 Seba, iii. 25. 7. 



Chaetodon canescens, Artedi, Spec. p. 93 ; L, Syst. Nat. i, p. 460 : Bl. 



Schn. p. 219. 

 Zanclus centrognathus, Cuv. ^ Val. vii. p. 528. 



39 • 31 



No horn on the forehead ; praeorbital with a strong spine above 



