714 Memoirs of the Indian Museum. [Vol. V. 



Hamilton Buchanan's figure does not show the round marking on the post-opercle. 

 Day's figures— both for D. polota in Fish. Ind. and for D. quadrifasciatus in the Fauna — show 

 these markings, though no mention is made of them in the text. This round marking 

 on the post-opercle is very conspicuous in all the young ones but is not traceable in the 

 larger specimens in the collection. The ventral fin, the base of which is almost directly 

 below the root of the pectoral fin, has one spine and five branching rays ; the spine is 

 outermost and of the rays the two next the spine have filiform endings, the inner one 

 having a much more elongated ending than the one next to the spine. The fish is a per- 

 manent inhabitant in the main area of the lake, where it breeds at the end of the rainy 

 season. 



There are altogether eleven specimens in the collection of which eight afe young. 



The following list gives the different parts of the lake from which the specimens were 

 collected, together with their number and size : — 











mm. 



4 specimens 



.. Mouth of Barkul 



Bay . 



.. 18th September, 1914 



... 21—37. 



3 „ 



... OffMottapur 





... 14th March, 1918 



... 50—60. 



1 specimen 



.. OfiNalbano ... 





.. 18th September, 1914 



... 22. 



2 specimens 



. . Ranibha 



. 



.. 21— 31st July, 1913 



... 125—175. 



1 specimen 



,, 





.. 1st January, 1915 



... 142. 



Distribution. — The estuaries of the Ganges and the rivers of Burma, Siam, the Malay 

 Peninsula and the Malay Archipelago. 



Family SEKRANIDAE. 



Sub-family CENTROPOMINAE. 



Genus LATES Cuvier and Valenciennes. 



Lates calcarifer (Bloch). 



1790. Holocentrus calcarifer, Bloch, Ausl. Fisch. TV, p. 100, pi. ccxliv. 



1801. Perca calcar, Bloch and Schneider, Syst. Ichthyol. I, p. 89. 



1802. Holocentrus heptadactylus, Lacépède, Hist. Nat. Poiss. IV, p. 344. 



1803. Perca sp. {pandoomenoo), Russell, Fish. Vizagapatam II, p. 23, pi. cxxxii. 

 1822. Coins vacti, Hamilton Buchanan, Fish. Ganges, pp. 86 and 369, pi. xvi, fig. 28. 

 1828. Lates nobilis, Cuvier and Valenciennes, Hist. Nat. Poiss. II, p. 96, pi. xiii. 

 1828. Lates calcarifer, id, ibid., II, p. 100. 



1845. Lates nobilis, Bleeker, Nat. Geneesk. Arch. Ned. Ind. II, p. 524. 



1846. Lates nobilis, Richards, Rep. Brit. Assoc. Adv. Sc. 1845, p. 222. 

 1846. Lates calcarifer, id., ibid. 



1849. Lates nobilis, Bleeker, Verh. Batav. Gen. XXII, p. 27. 



1849. Lates heptadactylus, Bleeker, Journ. Asiat. Soc. Bengal, p. 983. 



1853. Lates nobilis, Jerdon, Madras Jour. Lit. Sei. XVII, p. 128. 



1859. Lates calcarifer, Günther, Cat. Fish. Brit. Mus. I, p. 68. 



1865. Lates calcarifer, Day, Fish. Malabar, p. 2. 



1870. Lates calcarifer, Günther, Proc. Zool. Soc. London, p. 824. 



