cclxviii 



of month transverse. Nostrils remote from one another. Barbels six 

 (Silurus, Bleeker), orf&ur (Parasilurus, Bleeker), one pair being maxillary, 

 and one or two pairs mandibular. Teeth cardiform or villiform in the 

 jaws, in one or two transverse bands on the vomer, none on the 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 cavity, not enclosed in bone. 



106. Silurus Wynaadensis, Day. D. 5, A. 58-62. Six barbels. 

 Leaden colour. Wynaad. 



107. Silnrus Coc.hinsinensis, Cuv. & Val. D. 4, A. 62. Dark 

 coloured. Darjeeling, Akyab, Tenasserim Provinces to Cochin China. 



Genus CHACA, Cuv. fy Vol. 



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 jaw 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- 

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

 to ten rays, the second longer (8 to 12) and confluent with the caudal: 

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

 in bone. 



108. Chaca lophioides, Cuv. & Val. D. J/25, A. 10/12. Some 

 short tentacles on head and body. Ganges. Dr. Giinther states there 

 is a stuffed specimen in the British Museum of this fish from Nepal, 

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



109. Chaca Bankanensis, Bleeker. 0.^22-24, A. 9/11-12. No 



tentacles ; head and body granular. Assam and Burma. 



110. Chaca Buchanani, Giinther. D. J/18, A. 8/8. Head and 

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



Sub-Family AMBLYCEPIN.E. 

 Air-vessel more or less enclosed in bone. 



Genus CLAEIAS, Gronov. 



Macropleronotus, Lacep, 



Form of body elongated and compressed. Gill-membranes separated 

 by 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 fin spineless 

 and with an elongated base, extending from the neck to the caudal, with 

 which it may be continuous: no adipose fin: ventrals with six rays: pectoral 

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

 formed across the body and lateral processes of the anterior vertebra. 



