i 9 i6.] 



Fauna of the Chilka Lake ; Fish. 



431 



eye is contained two and a half times in the length of the snout and three and a half 

 times in the length of the interorbital distance. 



The barbels are rather short; the maxillary barbels are three-fourths of the 

 length of the head, the mandibular pair is as long as the interorbital distance and the 

 mental pair is as long as the snout. 



Fig. 6. — Anus satparanus, Chaudhuri, x §. 



The dorsal fin has one spine and six rays, the spine is feebly serrated behind 

 and granulated in front. The height of the fin is equal to the length of the maxillary 

 barbels and the length of the spine is about 80 % of the height of the fin. The base 

 of the adipose dorsal fin is two-thirds of its length and is contained ten and a half 

 times in the distance between the two dorsal fins. 



The pectoral fin contains one spine and ten rays 

 and does not reach the ventral fin. The spine is 

 somewhat flattened and is serrated both ways. The 

 ventral fin has six rays, the outer one of which is arti- 

 culated. It is three-fourths the length of the pec- 

 toral, and the vent is just above the middle of the 

 fin when it lies horizontally along the body. The 

 anal fin has nineteen rays, a few of the anterior rays 

 are in front of the vertical line from the origin of the 

 adipose dorsal. The caudal fin is deeply forked with 

 rounded lobes, the upper being slightly longer than 

 the lower portion. 



The teeth in the jaws are villiform, in the upper 

 jaw the space covered with these teeth is divided into 

 two equal ellipsoidal areas with a separating line in 

 the middle. In the lower jaw the space is divided 

 into two short and narrow arcuate areas with a broad 

 toothless space in the middle. The palatine teeth are granular and occur in two 



Fig. 7 



Arius satparanus, Chau- 

 dhuri, x §. 

 Dorsal view of the head. 



