142 TELEOSTEI. ACANTHOPTERYGII. 



than iu A. matoides. Teeth eight or nine incisors on each side of 

 both jaws, serrated along f of their external edges. Fins dorsal 

 spines increase in length to the last, which is nearly or quite as 

 high as the anterior rays and J- the height of the body ; the inter- 

 spinous membrane scarcely einargiuate ; the posterior portion of 

 the fin and of the anal angularly rounded. Pectoral as long as 

 head. Third anal spine equal to about If cliain. of orbit, and the 

 rays similar to those of soft dorsal. Caudal emarginate, upper 

 lobe the longer. Scales rudimentary on head and over the nape, 

 becoming ctenoid and in angular rows on the body ; there appear 

 to be about 150 to 160 rows descending to the lateral line, and 

 about 16 or 18 rows between lateral line and base of last dorsal 

 spine. Lancet-shaped spine on side of tail with a posterior process. 

 Colour blackish brown ; lips and fins black. 



.Flab. Red Sea, seas of India to the Malay Archipelago ; said to 

 attain 18 inches in length. 



899. (8.) Acanthurus celebicus. 



Acanthurus celebicus, Sleeker, Batavia Nat. Tijdsch. iii, p. 701 ; 

 Day, Fish. India, p. 206 (see synon.). 



D. 8-9/26-35. P. 16. V. 1/5. A. 3/24. C. 16. 



Length of head 4|, of caudal 3|, height of body nearly 3 

 in the total length. Eyes diameter about 3| in length of head. 

 Profile of snout concave. Teeth about 16 lobate incisors in the 

 upper, and 20 in the lower jaw. .Fin* last dorsal spine the 

 longest ; dorsal and anal rays of about the same height and about 

 f of that of the body, the posterior extremity of both fins obtusely 

 rounded. Ventral fins and caudal lobes pointed. Scales small, 

 ctenoid, but much larger than in A. matoides or A. mata, there 

 being about 80 rows. Colour brownish, darkest about the head ; 

 lips black, a white ring round the mouth. Dorsal, anal, and ven- 

 tral fins blackish brown ; outer half of pectoral yellowish. Caudal 

 blackish, posteriorly yellowish. 



Hob. Malay Archipelago. Kner states that he received a single 

 specimen from Madras. 



900. (9.) Acanthurus melanurus. 



Acanthurus melanurus, Cm. $ Vol. H. N. Poiss. x, p. 240 : Day, Fish. 

 India, p. 200 (see synon.). 



D. 9/25-26. P. 15. V. 1/5. A. 3/24. C. 16. 

 Length of head 3-i of caudal 5, height of body 2 in the total length. 

 %^-diameter 21 in length of held, 1 diam. from end of siJut. 

 Fins-second dorsal spine longest and strongest, being nearly 

 equal to 1 diam. of the orbit. Caudal cut square or slightly emar- 

 ginate. Sc ^-rudimentary or absent. CWour-brownishwhite, 



