MCCULLOCH. 33 



116. Optonurus Gthr., Challenger Zool. xxii, 1887, pp. 124, 147 (denticulatus) . 

 110a. 0. denticulatus. Macrourus denticulatus Rich., Iehth. Erebus & Terror, 



1846, p. 53, pi. 32, 1-3 (PI. xi). 

 Inhabits deep water. Length 15 inches. 



Nannygai, Knight Fish and John Dory.— Order BERYCOMORPHI. 



A. Dorsal spines increasing in length backward, forming a single fin with the rays. 



B. V.i/7, anal with 4 spines. Family Berycidae (No. lxiii) . 

 BB. V.i/6, anal with 2-3 spines. Family Irachichthyidae (No. lxiv). 



AA. Dorsal spines decreasing in length posteriorly, and forming a portion of the 

 fin distinct from that of the rays. 



C. Body enveloped in thick bony scutes; V.i/3. 



Family Monocentridae (No. lxv) . 

 CC. Body with small scales or naked; V.i/5 — i/6- 



Family Zeidae (No. lxvi). 



LXIII. Family Berycidae. 



117. Trachichthodes Gilchrist, Mar. Invest. S. Africa ii, 1903, p. 203 (spinosus). 

 117a. T. affinis. Nannygai. Beryx affinis Gthr., Brit. Mus. Cat. Fish, i, 



1859, p. 13. Hoplopteryx affinis Regan, A.M.N.H. (8) vii, 1911, p. 5, 

 pi. 1 (PL xii). 

 Abundant in deep water off the coast, and often taken on lines around rocky 

 reefs. Remarkable for its iridescent pink colouration. Length 18 inches. 



LXIV. Family Trachichthyidae. 



A. Vent far behind the ventral fins. 



B. Dorsal with 3, anal with 2 spines, the fins covered with asperities. 



Trachichthys (118). 

 BB. Dorsal with 4-7, anal with 3 spines, the fins not covered with asperities. 



Hoplosteihus (119). 

 AA. Vent placed between the ventrals. Paratrachichthys (120>. 



118. Trachichthys Shaw & Nodder, Nat. Miscell. x, 1799, p. 378 (australis). 

 118a. T. australis. Roughy. Id. Shaw & Nodder, Tom. cit. Id. McCoy, 



Prodr. Zool. Vict. dec. xii, 1886, pi. 114 (PI. xii). 

 A small rugose fish inhabiting rocky reefs. Length about 6 inches. 



119. Hoplostethus Cuv. & Val H. N. Poiss. iv, 1829, p. 469 (mediterraneus). 

 A. 4 dorsal spines; depth about 3 in the length. elongatus (119a). 

 AA. 6 dorsal spines; depth about 2 and 1 third in the length. intermedins (119b) . 



119a. H. elongatus. TracMchthys elongatus Gthr., Brit. Mus. Cat. Fish, i, 

 1859, p. 10, and Challenger Zool. xxii, 1887, p. 22, pi. 5, c. 

 A very rare deep-water species Length 5 inches. 



119b. H. intermedius. Trachichthys intermedins Hector, Tr. N. Zeal. Inst, vii, 

 1875, p. 245. pi. 11. II. intermedins McCulloch, Biol. Res. Endeavour ii. 

 3, 1914, p. 100, fig. 6 (PI. xii). 

 An inhabitant of deep water. Length about 7 inches. 



120. Paratrachichthys Waite, Mem. Austr. Mus. iv., 1, 1899, p. 64 (trailli) ■ 

 120a. P. trailli. Sandpaper Fish. Trachichthys trailli Hutton, Tr. N. Zeal. 



Inst. viii. 1876, p. 212; Id. Gthr., Challenger Zool. xxii, 1887, p. 23, pi. 

 55, a (PI. xii). 

 Common in deep water and often taken by trawlers. Length 10 inches. 



