1 88 TELEOSTKT. PH Y SO8TOM I . 



Pectoral spine stronger than dorsal and rather longer, roughened 

 and slightly serrated externally, denticulated internally. Base of 

 adipose dorsal slightly shorter than that of the rayed fin. Ventral 

 scarcely reaching the anal. Upper caudal lobe the longer. Colour 

 greyish silvery, becoming white on the sides and below. Fins 

 stained grey, with a white outer edge to the anal. Adipose dorsal 

 with a dark blotch. 

 Hob. Coasts of India. 



201. (23.) Arius dussumieri. 



Arius dussumieri, Citv. fy Val. H. N. Poiss. xv, p. 84 ; Day, Fish. 

 India, p. 467, pi. cvii. fig. 7 (see synon.). 



B.vi. D. 1/7 | 0. P. 1/12. V. 6. A. 14-16(4-5/10-11). C. 17. 



Length of head 4 to 4|, of caudal fin 5, height of body 5 in the 

 total length. Eyes diameter 6| in the length of head, 2 5 dia- 

 meters from the end of snout, and 4 apart. Head one fourth wider 

 than high, its width equals its length excluding the snout, or even 

 behind the angle of the mouth. Upper jaw the longer, the width 

 of the gape of the mouth equals four ninths of the length of the 

 head. Median longitudinal groove shallow, becoming most distinct 

 posteriorly, where it reaches the base of the occipital process, 

 which is strongly keeled and nearly (or quite) as wide at its base as 

 it is long, its lateral edges are nearly straight, and it extends to 

 the basal bone, which is narrow and S-shaped. A few scattered 

 granulations on the posterior portion of the head and over the 

 base of the occipital process. Barbels the maxillary reach just 

 beyond the base of the pectoral, the external mandibular are not 

 quite so long. Teeth obtusely conical on the palate, in four 

 widely separated patches, those on either side of the vomer being 

 smaller than the palatine patches. Fins the dorsal as high as the 

 body, its spine as long as the head excluding the snout, anteriorly 

 in the upper half serrated, in the lower roughened, posteriorly 

 serrated throughout ; the length of the base of the adipose dorsal 

 equals half of that of the rayed fin. Pectoral spine rather shorter 

 than that of the dorsal, externally it is serrated in its anterior 

 half, rough in its posterior, internally it is serrated ; it reaches 

 two thirds of the way to the ventral. Ventral just reaching 

 the anal. Colour bluish along the back, becoming lighter on the 

 sides and below, fins blackish externally. 



Hob. Malabar coast of India and Ceylon. 



23. Genus KETENGUS, Bleeker. 



Branchiostegals five. Gill-membranes united, not confluent 

 with the isthmus, but having a free posterior edge, which is 

 notched. Upper surface of head osseous. Eyelids with a free 

 circular margin. Cleft of mouth deep ; upper jaw the longer. 

 Barbels six, small, no nasal ones. Nostrils approximating, the 



