1923.] Fauna of the ChilJca Lake : Fish. 751 



Genus APOCRYPTES Cuv. and Val. 



Apocryptes rictuosus (Cuv. & Val.). 

 1876. Apocryptes rictuosus, Day, Fish. India, I, p. 300. 



There are four specimens in the collection, the largest of which is 69 mm. in length. 

 The species is readily distinguished by the presence of a well-marked black ocellus on the 

 last few dorsal rays. The caudal fin is marked with a number of faint brownish bands. 



The following statement gives the different localities whence the specimens were collected 

 and their number and size : — 



1 specimen ... Main channel west of Satpara Island ... 16 March 1914 ... 62 mm. 



2 specimens . . . Channel between Satpara and Barhampur ... 69 & 56 mm. 



Islands. 



1 specimen ... Barkul ... ... ... 18 September 1914 45 mm. 



Distribution. — The seas and estuaries of India. 



Apocryptes lanceolatus (Bl. & Sehn.). 

 1876. Apocryptes lanceolatus, Day, Fish. India, I, p. 301, pi. lxiv, fig. 5. 



This species is represented by a single specimen in the collection. The specimen was 

 obtained in the South Bay of the lake and is 168 mm. in length. 



Distribution. — The seas of India, extending to the Malay Archipelago. 



Genus MICRAPOCRYPTES, nov. 



The new genus resembles Apocryptes Cuv. and Val. in the structure of the teeth, at any 

 rate in the adult male, but exhibits sexual dimorphism in this respect. It is chiefly distin- 

 guished by the small size and hyaline tissues of the fish and by the moderately compressed 

 and elongate form. The tongue is notched in the middle and the scales are feebly ctenoid. 



The type-species is Micrapocryptes fragilis, sp. nov. from the Chilka Lake and the 

 Gangetic delta. 



To this genus I refer Apocryptes brachypterus Bleeker 1 from Java. It is said to occur 

 in the lake Grati (Province of Pasuruan). Günther 2 was of opinion that this species had 

 more affinity to his genus Latrunculus than to the typical species of Apocryptes. Micra- 

 pocryptes differs from Latrunculus in the possession of feebly ctenoid scales, which are firmly 

 set on the body, in its small size and the small mouth-opening. The dentition is also 

 different in the two genera. 



Micrapocryptes fragilis, sp. nov. 

 The species consists of small transparent Gobies, in which the body is but moderately 

 elongated and the form is compressed from side to side. The dorsal profile is slightly arched 

 and the ventral rises to the base of the caudal fin from just below the beginning of the dorsal. 

 The head is elongated and bluntly pointed. The caudal peduncle is somewhat constricted 

 and in this region both the dorsal and the ventral profiles are almost straight and parallel. 



1 Bleeker, Nat. Tijdschr. Ned. Ind. IX, p. 401 (1885). 

 Günther, Cat. Brit. Mus. Fish. Ill, p. 80 (1861). 



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