4. HOLACANTHUS. 53 



with curved, concentric, alternately white and bluish transverse 

 lines, the posterior of wliich forms a complete ring ; on the dorsal, 

 caudal and anal fins, the lines are divided and form reticulations ; 

 the posterior half of the caudal is white. 

 East Indian Aix'hipelago. 



29. Holacanthus semicirculatus. 



Holacauthus semicirculatus, Cuv. Sf Val. vii. p. 191. pi. 183 ; Bleek. 



Amboina, vi. p. 414 (not Banka, p. 452) ; Voy. Cuqu. Zool. Poiss. 



p. 173. pi. 30. f. 3. 

 Chsetodon microlepis. Sleeker, Sumatra, ii. p. 257. 



"■-IT- ^-M- 



Scales small. The prseopercular spine is smooth, and reaches to 

 the vertical from the posterior margin of the operculum ; anal and 

 dorsal fins triangular, not produced. Entirely black, with curved, 

 concentric, alternately white and bluish transverse lines, the white 

 ones being bi'oader ; caudal black, with white cross-streaks. 



East Indian Archipelago ; PoljTiesia. 



a. Adult. Feejee Islands. Voyage of the Herald. 



b, c. Adult and yoimg. Amboyna. Purchased of Mr. Frank. 

 d. Adult. From the CoUeetion of the Zoological Society. 



30. Holacanthus striatus. 



Holacauthus striatus, Riippell, N. W. Fische, p. 32. taf. 10. f. 2 ; Bleek. 



Amboina, vi. p. 414. 

 semicirculatus, Bleeker, Banka, p. 452 (not Cuv.). 



23 21 



Scales small. The priBopercular spine reaches to the vertical from 

 the posterior margin of the operculum. Black, with cuived, concen- 

 tric, alternately white and bluish transverse lines, the white ones 

 being broader ; caudal white. 



Red Sea. 



«. Half-grown. Red Sea. 



31. Holacauthus alternans. 



Ctiv. 4- Val vii. p. 193. 



Scales small. Dorsal produced into a long point; anal angular. 

 Brown, dotted with darker anteriorly, with lighter posteriorly and 

 on the dorsal and anal fins ; four white vertical lines on the side of 

 the head ; body with curved white transverse lines, alternately 

 broader and narrower, those on the tail vertical and straight ; caudal 

 with one or two white transverse lines. {Cuv.) 



Sea of Madagascar. 



