6. GLYPHIDODON. 35 



Prseoperculum not denticulated. Teeth compressed, in a single 

 series ; the series sometimes composed of alternate teeth. Dorsal 

 fin with twelve or thirteen spines, anal with two (three in O. nigros). 

 Scades of moderate size, in 30 or less transverse series ; the lateral 

 line ceases below the posterior portion of the dorsal fin. Branchio- 

 stegals five or six ; gills three and a half; pseudobranchias present ; 

 an air-bladder. Pyloric appendages three. 



Tropical seas of both hemispheres. Single species extend north- 

 wards to the latitude of Madeira in the Atlantic and of California 

 in the Pacific, southwards to the latitudes of New Zealand and of 

 South Australia. 



Synopsis of the Species. 



I. Teeth fixed : Glyphidodon. 



A. Body with several transverse bands. 



1. Cross-bands darker than the ground-colour, p. 35. 



2. Cross-bands lighter than the ground-colour, p. 43. 



B. Body more or less uniform, or bicoloured, or with small ornamental 



markings. 



1. The height of the body is one-half, or more than one-half, of the 



total length (the caudal fin not included), p. 44. 



2. The height of the body is less than one-half of the total length 



(the caudal fin not included), p. 50. 



II. Teeth in the upper jaw moveable : Microspathodon, p. 57. 

 (III. Three anal spines, p. 57. ) 



I. Teeth fixed. 



A. Body with several transverse bands. 



1. Cross-bands darker than the ground-colour. 



1 . Glyphidodon saxatilis. 



The Jaqueta. Ija Demoiselle. 



Marcgr. p. 156 ; Pison. Lid. p. 68. 



Cheetodon saxatilis, L. Syst. Nat. i. p. 466; Bl iii. p. 96, part, (the 



figure appeals to be taken from an Indian specimen). 

 marginatus, Bl. iii. p. 98 (tab. 207 incorrect) ; Lac6^p. iv. pp. 461, 



463. 

 mauritii, Bl. iii. p. 109. taf. 213. fig. 1 ; Bl. Schn. p. 234; Lac6p. 



iv. pp. 452, 470. 



les Glyphisodons. Toutes lea ecailles sent vermicul^es et le bord de 

 chacune richement guilloche. La prunelle grande et noire est entour^e 

 d'un petit cercle jaune. Une teinte l^gere de violet couvre la tete. Le 

 ventre est violet bleuatre, le dos grisatre ; ia dorsale, I'anale et la ventrale 

 sent noires ; la pectorale griae, la qUeue et la caudale aurores. Une 

 bande verticale qui embrasse la largeur de trois ecailles est plac6e uu 

 peu avant la queue. L'individu a 3J pouces de long." — Mauritius. 



u 2 



