5. POMAC'ENTRUS. 



17 



* Caudal lobes or some rays of the vertical fins produced iuto fila- 



ments, p. 20. 



10. P. violasceus. 12. P. polynema. 13. P. cyanostignia. 



11. P. cvanomus. ' 14. P. tfeniuinis. 



** None of tlie rays of the vertical fins are prolonged, p. 22. 



15. P. siiusiang. 17. P. prosopotasnia 19. P. melanotus. 



16. P. pavo (perspicillatus). 20. P. melanopterus. 



(pavoninus). 18. P. cseruleus. 21. P. obtusirostris. 



b. The height of the body is more than oue-third of the total leng-th. 



* Blue lines along the nape and the forehead, p. 25. 



22. P. trilineatus. 24. P. bankanensis. 2o. P. rectifrfenum. 



23. P. trenionietopon. 26. P. quadrigutta. 



** Forehead without longitudinal lines, p. 28. 



27. P. rhodonotus. 



scolopsis. 



dorsalis. 



chrj'surus. 



punctatus. 



cyanospilus. 



moluccensis. 



34. P. interorbitalis 



35. P. leucostictus. 



36. P. fuscus. 



37. P. otophonis. 



38. P. xanthui'us. 



39. P. littoralis 



(katunko). 



40. P. tripunctatus. 



41. P. vauicolensis. 



42. P. planifrons. 



43. P. nigi'icans. 



44. P. latifrons. 



1. Pomacentrus robuBtus. 



D. 



A. 



L. lat. 28. L. transv. 4/10. 



The height of the body is two-fifths of the total length (one-half, 

 without caudal), the length of the head one-fourth. The upper 

 profile, from the origin of the dorsal fin to the snout, is a regular 

 curve ; interorbital space convex, wider than the orbit. Prae- 

 orbital not serrated, nearly as wide as the orbit ; prscoporculum 

 finely denticulated. The dorsal spines are of moderate length and 

 strength, the third, fourth and fifth being the longest, two-fifths of the 

 length of the head ; the posterior spines are only half the length of 

 the middle soft rays ; the soft dorsal fin is higher than long. Caudal 

 fin shorter than the head, slightly emarginate, with the lobes ob- 

 tusely rounded. The second anal spine is very strong, and as long 

 as the fom-th of the dorsal fin. The first ventral ray is produced 

 into a veiy short filament. Greenish-olive, the scales on the lower 

 parts of the sides ha\'ing a light centre ; seven or six blackish-brown 

 cross-bands, broader than the ground-colour between them : the 

 first is ill defined, across the head ; the second from the nape and 

 origin of the dorsal to the base of the pectoral, which has a black 

 spot superiorly in its axil ; the third, fourth and fifth from below 

 the spinous dorsal ; the sixth from the soft dorsal fin to the end of 

 the anal ; the seventh is indistinct, across the back of the tail. Ven- 

 tral fin blackish, the first soft ray white along the outer margin. 



Hab. ? 



a. Fine specimen, six inches long. From the Haslar Collection. 



VOL. IV. 



