ADDENDA. 



The following four species are doubtful ones that 

 should have been noticed in the Appendix to Chap. V. 



Ophiocephalus nigricans, Cuvier. 



This fish is said to come from the East Indies, but 

 the locality seems doubtful. 



Description. Dorsal rays 50. Anal 34. Large 

 teeth in the lower jaw, on the vomer and palatine 

 bones. Depth of body contained 9 times, length of 

 head 4| times in the total length. 



Colour brownish black, with some indistinct darker 

 bands across the back. Dorsal and caudal fins black. 



Rita rama, Ham. Buchanan. 



This small fish, found by Buchanan in the Brama- 

 putra river, was described and figured by him under 

 the name of Pimelodus rama. It would appear to 

 belong to the Genus Rita, and may perhaps be the 

 young of some larger species. 



Description. Dorsal rays 8 ? Anal 15. Barbels 

 6, thick and shorter than the head. 



Colour yellowish, body diaphanous. On the nape 

 is a large black spot, divided into four lobes. 



