ACANTHOCHROMIS 27 



portion whitish; caudal whitish excepting the upper and lower 

 borders which are broadly blackish; pectoral whitish. 



Here described from thirteen specimens, 45 to 54 millimeters 

 in length, collected by Dr. Albert W. Herre at Tambagaan, 

 Bungau, and Sibutu Islands, all of Sulu Archipelago. 



This species differs from the other members of this genus in 

 having a blackish longitudinal band on each caudal lobe, and 

 only the hind limb of the preopercle serrated. 



Genus ACANTHOCHROMIS Gill 



Acanthochromis GILL, Proc. Acad. Nat. Sci. Phila. 15 (1863) 224; 

 polyacanthus. 



Body oblong, compressed, covered with finely ctenoid scales, 

 about 28 to 31 in longitudinal series; lateral line ter- 

 minating below base of anterior dorsal rays. Orbital ring and 

 preopercle serrated. Teeth in a double series, conical, those 

 in outer row larger. Dorsal fin continuous and even, with 16 

 or 17 spines. 



This genus is separated from Chromis by the serrated orbitals 

 and preopercle, and the greater number of dorsal spines; it 

 differs from Dascyllus in the presence of a double series of teeth 

 and of a greater number of dorsal spines also. 



ACANTHOCHROMIS POLYACANTHUS Bleeker 



PLATE 6, FIG. 2 



Dascylliis poly acanthus BLEEKER, Nat. Tijd. Ned. Ind. 9 (1855) 503; 



GUNTHER, Cat. Fishes 4 (1862) 15; WEBER, Fische der Siboga 



Exped. (1913) 357. 

 Acanthochromis polyacanthus BLEEKER, Nat. Verb. Holl. Maats. Wet. 



2 (1877) 151; Atlas Ichth. 9 (1878) pi. 410, fig. 7. 



Dorsal XVI or XVII, 14 or 15; anal II, 15 or 16; scales in 

 lateral series 28 to 31; with tubules 19 to 23; between lateral 

 line and origin of dorsal 6 or 7; between lateral line and vent 

 13 or 14. 



The deep oblong body 1.8 to 1.9 in length, with the back 

 and the abdomen about equally elevated; head 3.2 to 3.5 in 

 length of body, its profiles nearly at right angles with each 

 other; depth of caudal peduncle nearly twice in length of head 

 or 6.6 to 7 in that of body. Interorbital space evenly and 

 strongly arched, its width 2.5 to 2.8 in head and much wider 

 than the length of the bluntly rounded snout, which is 3 to 3.9 

 in head; eye circular and moderate in size, its diameter 2.6 to 

 3.2 in head and slightly longer than maxillary which ends pos- 



