cclxviii 



of moiUh transverse. Nos/rils remote frora one another. Barbels sir 

 (Slltirus, lUeekoi), or faur (PurasUurus, Blocker), one pair be'niy ma.villari/, 

 and one or two pairs mandibular. Tcet/i cardiform or viUiform in t/ic 

 j'aios, in one or two transverse bauds on the vomer, none on tie palatines. 

 One very short and spineless first dorsal fin, but no adipose one : anal 

 terminates close to, but is not continuous with the caudal : ventral 

 situated posterior to the dorsal, and consisting of eight or more rays. 

 Air-vessel in the abdominal cavdy, not enclosed in bone. 



106. Silurus iri/naadensis. Day. D. b, A. 58-62. Six barbels. 

 Leaden colour. AVynaad. 



107. Silurus Coi-.hinsinensis, Cuv. & Val. D. 4, A. HiJ. Dark 

 coloured. Darjucliny, Ak^'ab, Tenasserim Provinces to Cocbiu Cbina. 



Genus — ChaCa, Cuv. ^- Val. 



Head very large, broad and depressed. Gill-membranes confluent, 

 with the skin of a broad isthmus, and the gill-opening somewhat contract- 

 ed; eyes minute. Gape of mouth very wide, lower jaio prominent. Barbels 

 six, small. Teeth villiform in both jaws, none on the palate. Two rayed 

 dorsal fins, the first with one spine and three or four rays, the second con- 

 fluent with the caudal : two rayed anal fins, the first with from eight 

 to ten rays, the second longer (8 ^o. 12) and confiuent with the caudal: 

 ventral with six rays : air-vessel in the abdominal cavity, not enclosed 

 in bone. 



108. Chaca lophioides, Cuv. & Val. D. i/ii5, A. 10/12. Some 

 sliort tentacles on head and body. Gang'es. Dr. Giintber states there 

 is a stufled specinien in the British Museum of this fish from Nepal, 

 presented by Mr. Hodgson : it is also found in Calcutta. 



109. Oiaca Bankancnsis, Blecker. D. A^/2ii-21., A. 9/11-12. No 



tentacles ; head and bod)' granular. Assam and Burma. 



110. Chaca Buchanani, Giintber. D. i/18, A. 8/8. Head and 

 body with short tentacles ; a ring of them around the eye. 



Sub -Family — Amblycepin^. 

 Aii'-vessel more or less enclosed in bono. 



Genus — Clarias, Qronov. 



Macropteronotus, Lacep. 



Form of body elongated and compressed. Gill-membranes separated 

 bi/ a deep notch ; a dendritic accessory branchial apparatus is attached to 

 the convex side of the second and fourth branchial arches, and is received 

 into a recess behind the place of the usual gill-cavity. Eyes small, the lids 

 having a free circular margin. Superior and lateral portions of the head 

 osseous, and covered with very thin skin. Gape of mouth moderate, an- 

 terior, and transverse, its cleft small. Barbels eight, one nasal, one 

 maxillary and two mandibular pairs. Villiform teeth in the jaws, and 

 a similar or granular band across the vomer. Dorsal Jin spineless 

 and with an elongated base, extending from the nech to the eaudal, with 

 which it may be continuous: no adipose Jin: venlrals with six rays: pectoral 

 with a spine. Air-vessel small, transverse, entirely enclosed in a bony cirily, 

 formed across the body and lateral processes if the anterior vertcbnc. 



