42 SQUAMIPINNES. 



orbit, conical and horn-like in adnlt specimens, scarcely visible in 

 younger ones ; a tMrd, obtusely conical, on the nape of the neck. 

 A black band from the origin of the dorsal, occupying the whole 

 head to the prajoperciilar margins; the second black band nearly 

 entu-ely suppressing the ground colour, from the third to the seventh 

 dorsal spines to the belly, and extending from the root of the pec- 

 torals and ventrals to the end of the anal, which, like the ventrala, 

 is entirely black. 

 Molucca Sea. 



a. Adult. Molucca Sea. 



h. Half-grown. Amboyna. Purchased of Mr. Frank. 



e. Yery fine specimen. Amboyna. Purchased of Mr. Frank. 



4. HOLACANTHUS*. 



Holacanthus, Lacep. iv. p. 525 ; Cm: Sf Val. vii. p. 153. 



Body compressed, and generally much elevated. Praeoperculum 

 with a strong spine at the angle. One dorsal, entu'ely scaly, -with 

 twelve to fifteen spines ; the anal with tlii'ee (exceptionally with 

 four). No teeth on the palate. Scales of moderate or small size. 

 Six branchiostegals ; air-bladder with two posterior horns ; pyloric 

 appendages in increased number. 



Inhabitants of nearly all the tropical seas. 



The species may be grouped together as follows : — 



I. Species with scales of moderate size. 



A. With longitudinal bands, p. 42. 



B. Trunk -wdth a whitish vertical blotch or band, p. 45. 



C. Body ornamented by several cross-bands, p. 46. 



D. Body imiform or bicoloured, or merely spotted, p. 49. 



II. Species with small scales. 



A. Body with longitudinal bands, p. 52. 



B. Body with white or bluish transverse lines, alternately broader and 



narrower, p. 52. 



C. Body without bands, p. 54. 



I. Species with the scales of moderate size. 

 A. With longitudinal bands. 



1. Holacanthus annularis. 



Chjetodon annularis, Bl. tab. 215. f. 2 ; i. Gm. p. 1262 ; Bl. Schn. 



p. 219 ; Shaw, Zool. iv. p. .330. pi. 47. 

 Holacanthus annularis, iwcep. iv. pp. 526, 533 ; Cm: ^- Val. vii. p. 178 ; 



Cant. Catal. p. 164; Bleek. Verh. Bat. Gen. xxiii. Chcetod. p. 26. 



* 1. Holacanthus mokhella, {Ekrenb.) Ciiv. S; Val. vii. p. 177. — Red Sea. 



2. flavissimus, Ciw. Sf Val. vii. p. 197. — Island of Ulea. 



3. hit«olus, {Parkins.) Cm: # Val. vii. p. 198.— Otaheite. 



