5. MOKACAKXHUS. 283 



short, not moveable. Dorsal and anal fins low. Uniform brown 

 or black. 



Indian Ocean and archipelago. 



a-b. Adult (6 inches long) male and female. East-Indian archi- 

 pelago. From Dr. Bleeker's Collection. 

 c. Adult. Celebes. 



3. Monacanthus longirostris. 



Valent. figs. 92 & 100 ; Renard, i. tab. 19. fig. 94, tab. 81. fig. 170, 



ii. tab. 36. fig. 165 ; Ruysch, tab. 4. fig. 23, tab. 12. fig. 18 ; Seba, 



ill. tab. 24. fig. 19, ill. tab. -.'A. fig. 2. 

 Balistes hispidus (part.), L. Syst. Nat. i. p. 405. 



hispidus var. longirostris, Bl. Schn. p. 464. 



Monacahthus longirostris, Cuv. Rkgne An. ; Hollard, Ann. Sc. Nat. 



1854, ii. p. 331. 



chrysospUus, Bleek. Nat. Tyds. Ned. Ind. iv. p. 126. 



Oxymonacanthus longirostris, Bleek. Atl. Ichth. Balist. p. 137, pi. 10. 



fig. 1. 



D. 32. A. 31. 



Scales minute, rough, the spinules being a little longer on the 

 side of the tail. Body oblong, its depth being one-third of the total 

 length (without caudal). Snout much produced and pointed, the 

 upper and lower profiles being nearly equally oblique. Dorsal spine 

 rather strong, straight, rough, rather shorter than the snout, inserted 

 above the middle of the eye. Caudal fin rounded, short. Ventral 

 spine not moveable, attached to the abdomen by a simple membrane. 

 Dorsal and anal fins low. Bluish or greenish, with more or less 

 regular series of rounded reddish, dark-edged spots, which are larger 

 than the spaces of the ground-colour between them. Sometimes 

 a vertical black spot on the posterior half of the caudal fin ; some- 

 times small, white, brown-edged oceUi above the ventral spine. 



Indian Ocean and archipelago ; Feejee Islands. 



a, h. Three inches long. Amboyna. 



c. Two inches long. Feejee Islands. From Dr. Bleeker's Collection. 



2. Ventral spine present, moveable. 

 4. Monacantlms cryptodon. 



Monacanthus cryptodon, Bleek. Nat. Tyds. Ned. Ind. viii. 1865, 



p. 431. 

 Paramonacanthus cryptodon, Bleek. Atl. Ichth. Balist. p. 131, pi. 225. 



fig. 1. 



D. 26. A. 2Q. 



Skin finely velvety. Body rather elevated, its depth being one- 

 half of the total length (without caudal). Pectoral fin situated 

 behind the vertical from the orbit. Snout not produced, with the 

 upper profile straight. Dorsal spine of moderate strength, roughs 

 but without barbs, three-fifths as long as the head, situated above 

 the hinder part of the orbit. Caudal fi^ rounded ; dorsal and anal 

 fins low. Ventral spine tapering, moveable, without barbs, project- 



