ADDENDA. 
The following four species are doubtful ones that 
should have been noticed in the Appendix to Chap. Y. 
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. 
