182 NOTES ON THE GENERA OF AUSTRALIAN FISHES, 



We hope at intervals to coatribute further papers on the genera 

 of Australian fishes. 



Six genera are diflerentiated in this part, namely, Perca (intro- 

 duced), Percolates, Lates^ Psammoperca, Ctenolates, and Macquaria. 

 Their characteristics are as follows : — 



Genus Perca. 



Perca, sp., Artedi, Genera Pisciuni, 1738, Gen. 39, Syn. 66, 

 sp. 74 ; Cuvier, Regne Anim. ; Cuv. & Val., Hist. Nat. des Poiss. 

 1828, ii. p. 19. 



Branchiostegals seven : pseudob ranch ite present. Body oblong- 

 ovate, and somewhat compressed. Opercle spiniferous : preopercle 

 serrated on the vertical limb, and with denticulations pointing 

 forwards on the lower limb. Teeth villiform on the jaws, vomer, 

 and palatines ; tongue smooth. Two dorsal fins separated at their 

 bases, the first with 13 or 14 spines; the anal with two. Scales 

 rather small, ctenoid, absent on the upper surface of the head. 

 Pyloric appendages few. 



Genus Percalates. 



Percalates, gen. no v. 



Branchiostegals six : pseudobranchise present. Body oblong- 

 ovate, and somewhat compressed. Opercle with two spines : pre- 

 opercle serrated on the vertical limb, denticulated on the angle and 

 lower limb : preorbital and post-temporal bones serrated. Teeth 

 villiform on the jaws, vomer, and palatines; tongue smooth. One 

 dorsal fin deeply notched, with 9 spines : the anal with three. 

 Scales moderate, ctenoid, absent on the upper surface of the head, 

 and on the maxilla. Pyloric appendages in small numbers. 



Genus founded on Lates colonorum, Giinth. 



Genus Lates. 



Lates, Cuv. & Val., Hist. Nat. des Poiss. 1828, ii. p. 88. 

 Pseudolates, Alleyne & Macleay, Proc. Linn. Soc. N.S. Wales, i., 

 p. 262, (1875). 



