1. CH^TODON. 3 



First Group. CH^TODONTINA. 

 1. CH-ffiTODON*. 



Chsetodon, (Artedi) Cuv. Rbgne Anim. ; Cuv. <§• Vol. vii. p. 3. 



Body much compressed and elevated. One dorsal, without any 

 notch, with the spinous and soft portions similarly developed ; none 

 of the spines elongate. Muzzle shoii; or of moderate length. No 

 teeth on the palate ; praeoperculum entire or slightly sex'rated, with- 

 out spine. Scales generally large or of moderate size. Six branchio- 

 stegals. Air-bladder sometimes with horns or with two divisions. 

 Intestinal tractus with many convolutions ; pyloric appendages in 

 moderate number. 



Seas between the Tropics. 



I have divided the numerous species of this genus as follows, in 

 order to facilitate their determination : — 



I. Scales large or of moderate size, not exceeding: fifty-five transverse 

 series. 



A. More than ten dorsal spines. 



1. More than three anal spines, p. 4. 



2. Three anal spines. 



a. One or more of the dorsal rays elongate, p. 6. 



b. None of the dorsal rays elongate. 



a. A large round black or white spot — 

 aa. On the dorsal fin, p. 8. 

 bb. On each side of the body, p. 11. 

 /3. Without a round black or white spot. 



aa. Body with distinct longitudinal bands (not stripes), p. 13. 

 bb. Body with broad cross-bands, p. 17. 

 cc. Body without bands, with stripes or spots, or uniform. 

 aa, Ventrals dark-coloured, p. 21. 

 /3^. Ventrals light-coloured. 



* Caudal with a black cross-band or orescent, p. 23. 



* Caudal with a fine black cross-streak, p. 28. 



* Caudal with a blackish mai-gin, p. 30. 



* Caudal without dark fransverae streaks, generally uni- 



form, p. 31. 



B. Ten dorsal spines or less, p. 34. 



n. Scales small, in sixty or more transverse series, p. 34. 



* 1. Chaetodon mertensii, Cuv. ^- Val. vii. p. 47. — Hab. ? 



2. Benard, ii. 56. 239 ; Valent. f. 407. — Chsetodon principalis, Cuv. 4' Val. 



vii. p. 81. — East Indies. 



3. Chffitodon parallelus, Gronov. Syst. ed. Gray, p. 70.— East Indies. 



4. Chsetodon lunulatus, Quoy S^ Gaim. Toy. Freyc. Zool. p. 381. — Sandwich 



Islands. 



5. Chaetodon, no. 7, Artedi, Species, p. 95. — Hab. ? 



6. Chsetodon layardi, Blyth in, Kelaart, Prodrom. Faun'. Zeylan. Append. 



p. 50. — Cevlon. 



b2 



