90 FISH AND FISH-LIKE ANIMALS OF N.S.W., 



227. Scorpis Cuv. & Val., H. N. Poiss. viii, 1831, p. 503 (georgianus). 



A. Anal rays equal to, or more numerous than those of dorsal, lineolatits (227a). 

 AA. Anal rays less numerous than those of dorsal. violaceus (227b). 



227a. S. lineolatus. Sweep. Id. Kner, Novara Zool. i, Fische pt. 1, 



1865, p. 108, pi. 5, 3 (PI. xxvi). 

 Young specimens are very plentiful in inlets, while adults are more commonly 

 captured along the coast. Length 12 inches. 



227b. S. violaceus. Hard-belly. Ditrema violacea Hutton, Trans. N.Z. 



Inst, v, 1873, p. 261, pi. 8, 31b. 

 Abundant at Lord Howe Island, and once recorded from near Sydney. The 

 record needs verification. Length 9 inches. 



228. Atypichthys Gunther, B.M. Cat. Fish, iv, 1862, p. 510 (strigatus). 

 228a. A. strigatus. Mado. Atypus strigatus Gunther, B.M. Cat. Fish. 



ii, 1860, p. 64. Id. Steindachner, Sitzb. Akad. Wiss. Wien liii, 1866, 

 p. 435, pi. 4, 2 (PI. xxvi). 

 Plentiful in inlets along the coast. Length 10 inches. 



CVII. Family Scatophagidae. 



229. Scatophagus Cuvier & Valenciennes, H. N. Poiss. vii, p. 136 (argus). 



A. Margins of dorsal and anal fins subvertical; sides spotted above and below. 



argus (229a). 



AA. Margins of dorsal and anal fins extending obliquely forward; sides striped 



above, spotted below. mullifasciatus (229b). 



229a. S. argus. Spotted Butterfish. Chaetodon argus Lirme, Syst. Nat. 



12th ed., 1766, p. 464. S. argus Day, Fish. India, 1875, p. 114, pi. 



29, 3. 



A tropical species, rare in our waters. Length 12 inches. 



229b. S. multifasciatus. Butterfish. Id. Richardson, Ichth. Erebus 



& Terror, 1846, p. 57, pi. 35, 4-6 (PI. xxvi). 

 Plentiful in estuaries of the northern rivers. Length 16 inches. 



CVIII. Family Platacidae. 



230. Platax Cuvier, R. Anim. ii, 1817, p. 334 (teira). 



230a. P. teira. Bat Fish. Ch-aetodon teira Forskal, Descr. Anim., 1775, 

 p. 60; Id, Bleeker, Atlas Ichth. ix, 1877-8, p. 73, pis. 279, 2 and 382, 

 1 (PI. xxvii). 

 Another tropical species wandering southward into our northern waters. 

 Length 20 inches. 



CIX. Family Chaetodontidae. 



A. Dorsal spines not increasing in height backward. 



B. Snout produced into a slender beak; 9 dorsal spines. Chelmon (231). 



BB. Snout shorter, not beak-like; more than 9 dorsal spines. 



C. Fourth dorsal spine greatly produced and filiform. Heniochus (232). 

 CC. No elongate spine, the margin of the spines rounded. 



D. Scales minute, more than 70. Vinculum (233). 



DD. Scales larger, 35-60. 



E. Second anal spine longer than third. Microcanthus (234). 



EE. Second anal spine not longer than third. Chaetodon (235). 



AA. Dorsal spines increasing in height backward. 



F. Eleven dorsal spines. Chelmonops (236). 



FF. Six to seven dorsal spines. Parachaetodon (237) 



