4 SUrAMIPINNES. 



1. Spt'iics with Ini-ne or moderately large scales, not exceeding fifty-five 



transA-eri=e series. 



A. \Mth more than ten dorsal spines. 

 1. With more than thi'ee anal spines. 



1. Chsetodon strigangulus. 



Chietodon strigangulus, ( Suhuidcr) Gin. p. 12()9 ; Cur. Si- Vul. vii. 



p. 42. pi. 172 ; Beecheifs Voi/at/c, Zuolar/i/, p. CO. pi. 17. f. 2 ; Bleek. 



Bunda, i. p. 2o0. 

 triangularis, Riipp. Atlas, Fisc/ie, p. 42. pi. 9. f. 3. 



D. {|. A. ^. L. lat. 26. L. transv. 5/16. Vert. 10/14. 



The snout is not produced, and nearly equal in length to the dia- 

 meter of the eye. The soft dorsal is produced into an acute-angled 

 lobe. The ocular band rather narrower than the eye and white- 

 edged ; body with about twenty-five blackish stripes, angularly bent, 

 ^vith the angle pointing forwards. Caudal black, with whitish mar- 

 gin ; the dorsal and anal fins with a fine black marginal line ; ven- 

 trals whitish. 



From the Eed Sea to Polynesia. 



a. Fine specimen. Amboyna. Purchased of Mr. Frank. 



b. Adult : skeleton. Amboyna. Piux-hascd of IVlr. Frank. 



c. Adult. From the Collection of the Zoological Society. 



The intestinal tract makes a great many convolutions. The air- 

 bladder is divided into a large posteiior portion and into a smaller 

 anterior one. The anterior emits two small processes. 



SJreleion. — The slceleton of this and the other species of Chce- 

 todon shows several very remarkable modifications of the structure 

 of some bones of the skull. Tlie maxillary has so irregular a form, 

 that no description can give an adcijuate idea of it ; two portions 

 can be distinguished, a superior and an inferior, separated from 

 each other by the narrower and slightly bent middle of the bone. 

 A very long process, directed forwards, extends from the palatine 

 bone across the centre of the maxillary. The anterior portion of 

 the intermaxillary, in which the teeth are implanted, is nnich 

 swollen ; the posterior process is much longer than the descending- 

 branch. The mandibula also is swollen and very solid. The upper 

 portion of the skull appears as one solid, elevated, rounded, smooth 

 bony mass, without any ridges or grooves. The sutures between the 

 principal frontal bones and the supraoccipital alone are vi.sible. The 

 supraoccipital is continued posteriorly in the strong occipital crest, 

 which has the upper margin swollen, and extends on to the first 

 interneural. 



The infraorbital ring is moderately developed, and becomes gra- 

 dually narroM'er posteriorly. The praeopcrculum is smooth, with a 

 very rudimentary muciferous channel behind the interior ridge, which 

 is scarcely elevated ; the inferior limb is rather shorter than the pos- 

 terior. .The opercuhim is subquadrangular, not (piite twice as high 



