710 SURGEON F. DAY ON THE [Dec. 5, 



has the smallest air-vessel amongst the larger species which I have 

 examined. 



The genus extends throughout India and Burmah. 



Callichrous egertonii, sp. nov. 



Palloo, Punj. 



D. 4. P. i V. 8. A. 52-54. C. 17- 



Length of head about i (^\), of caudal g, height of body 4; of the 

 total length. 



Eyes. Diameter \ of length of head, 2 diameters from end of 

 snout. 



Snout obtuse, rounded ; lower jaw strongly prominent. Maxillary 

 barbels extend a little beyond the base of the pectoral fin, the man- 

 dibular pair are nearly half as long as the head. 



Teeth vomerine, in two separate patches. 



Fins. Dorsal very narrow ; pectorals rounded, rather longer than 

 the head without the snout, its spine moderately strong, nearly as 

 long as the postorbital portion of the head, and strongly denticulated 

 internally ; aual terminating close to the caudal, but separated from 

 it ; the latter fin forked in its posterior half, its upper lobe the longest. 



Colours. Olive, shot with purple and gold, its body and fins covered 

 with blotches of a brownish colour ; a large black finger-mark over 

 the posterior half of the pectoral spine. 



Hab. Subhimalayan range in the Punjaub. 



I have named the species after the Hon. It. Egerton, from whom 

 I have received great assistance in my investigations. 



Geographical distribution. — This genus extends throughout India 

 and Burmah to the Malay archipelago. The distinctions between 

 Cryptopterus, Bleeker, in the extended sense as accepted by Dr. 

 Giinther, and Callichrous seem to show the unadvisability of sepa- 

 rating them into distinct genera. 



Genus Wallago, Bleeker. 



Air-vessel of moderate size, situated in the anterior part of the 

 abdomen ; on removing its front wall it is found to be divided into 

 two lateral chambers by a longitudinal septum, which, however, has 

 a rounded orifice anteriorly, so as to admit of free communication 

 between the two sides. 



Geographical distribution. — India, Burmah, and the Malay ar- 

 chipelago. 



Genus Olyra, M'Clelland. 



Dorsal profile nearly horizontal, neck not elevated. Body low 

 and elongate. Head depressed, superiorly covered with soft skin. 

 Mouth terminal, transverse ; jaws about equal in length, or the lower 

 the longest. Nostrils remote from one another, the posterior pro- 

 vided with a barbel. Gill-openings wide, the membrane not confluent 

 with that of the isthmus. Barbels eight. Eyes small, subcutaneous. 

 Villiform teeth on the jaws and palate. First dorsal fin without a 



