ACANTIIUHLDjE. 143 



with a black band over occiput and another over free portion of 

 tail. From the whole of the space below the eye and opercle a 

 silvery band passes downwards to the chest. One specimen has a 

 dark mark on the shoulder. 



Hob. Seas of India to the Malay Archipelago. 



901. (10.) Acanthurus hepatus. 



Teuthis hepatus, Linn. Syst. Nat. i, p. 507. 



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



D. 9/19-20. P. 15. V. 1/2. A. 3/19. C. 17. 



Length of head 4|, of caudal 6, height of bodv 2J in the total 

 length. Eyes diameter 5 in length of head, 3^ diam. from end of 

 snout, and 2 apart. Upper profile of head rather convex. Pre- 

 opercle entire. Teeth six lobate incisors on either side of both 

 jaws. Fins last dorsal spine higher than first ray, behind which 

 the height of the rays gradually diminishes, the end of the fin 

 being rather angular ; interspinous membrane scarcely emarginate. 

 Pectoral -i length of head. Ventral spine strong, nearly \ as long 

 as the head, the inner ray also spiny at its commencement, but 

 having a bifurcated rayed extremity. Caudal emarginate, the 

 outer rays prolonged. Scales the dermal productions are stellate 

 and rough, about 12 rows exist between lateral line and base of 

 last dorsal spine ; none on the fins. Lancet-shaped spine on side 

 of tail, without any exposed posterior process. Colour slaty grey 

 on the back, becoming dashed with brownish grey along the abdo- 

 men. A deep brown band ascends from the posterior upper angle 

 of the eye, and passing backwards gradually widens until below 

 the fifth or sixth dorsal spine it extends over the upper half of the 

 bank, leaving an oval spot of ground-colour, as long as the head, 

 uncovered in the middle of the first part of its course. Just before 

 reaching the lancet-shaped process the band divides into two 

 portions, which rapidlv narrow and pass along either side of the 

 lobes of the tail. Dorsal spines orange-brown, membrane light 

 slate-colour, upper edge of the fin stained black. Pectoral blackish 

 grey, with a large yellow oval spot on its last fourth. Anal similar 

 to dorsal. Caudal canary-yellow, this colour extends on to the free 

 portion of the tail as far as the lancet-shaped spine. 



Hah. Seas of India to New Guinea. 



902. (11.) Acanthurus strigosus. 



Acanthurus strigosus, Bennett, Zool. Journal, iv, fasc. xiii, p. 41 ; 

 Day, Fish. India, p. 207, pi. xlvii, fig. 2, Stippl. p. 7c9 (see synon.). 



D. 8/28-30. P. 17. Y. 1/5. A. 3/26-27. C. 17. L. 1. ca. 120. 



Length of head 4 to 4f , of caudal 4 to 4|, height of body 2| in 



the total length. Eyes high up, diam. 4 in length of head, nearly 



2i from end of snout, aud l apart. Profile of snout very gibbous. 



