432 Memoirs of the Indian Museum. [Voi,. V, 



somewhat oval patches far backward on the roof of the mouth (text-fig. 8). There 

 are fifteen gill-rakers which are short and stiff. 



The colour of the fish (in spirit) in the upper part is dark brown tinged with blue; 

 the lower part of the sides and the abdomen are dull white. The margins of the 

 dorsal and caudal fins are black. 



The new species resembles Arius arius (Ham. Buch.) and also A. maculatus (Thun- 

 berg) in general appearance, but differs from both in the character of the teeth, the 

 length of the barbels and fins, as well as in the structure of the orbital margin; this 

 margin is not free, but is continuous in the middle with the skin of the forehead above. 



Type. — A specimen 210 mm. long, dredged in six and a half feet of water in the 

 channel between Satpara and Barnikuda, on 4~ix-l4. It is entered in the Indian 

 Museum register under No. F ^ 1 ^. 



Arius arius (Hamilton Buchanan). 



(Text-figure 9.) 



1822. Pimelodus arius, Hamilton Buchanan, Fish. Gang., pp. 170 and 376. 

 1878. Arius buchanani, Day, Fish. Ind., p. 463, pi. cv, fig. 6. 

 1889. Arius buchanani, Bay, Faun. Brit. Ind., Fish., I, p. 181. 



One young specimen, measuring 185 mm., obtained on 2-ix-i4 in the channel off 

 Satpara, is in the collection. The horizontal diameter of the eye is 22 % in the length of 

 the head, while in the adult it is 18 % to 13 % . The anal papilla has a wide lumen with 

 a thin fimbriated edge. The species is quite distinct from A.maculata (Thunberg), 

 which has longer barbels, different proportions, colouration and dentition (text-fig. 9). 



Probably this species is a permanent inhabitant of the outer channel. 



Distribution: — The estuaries of Bengal, Orissa and Burma. 



Arius caelatus, Cuvier and Valenciennes. 

 (Text-figure 10.) 



1840. Arius caelatus, Cuvier and Valenciennes, Hist. Nat. Poiss., XV, p. 66. 

 1878. Arius caelatus, Day, Fish. Ind., p. 459. pi. cv, fig. 5. 

 1889. Arius caelatus, Day, Faun. Brit. Ind., Fish., I, p. 174. 



There are two specimens in the collection. One is a young fish measuring 125 mm. 

 caught north of Patsahanipur on 3-iii-i4, the other is an adult fish measuring 245 mm. 

 secured off Barkul Point on 27-X1-14. The ventral fins are situated far backwards 

 in both specimens, almost reaching the anal fin, the anal opening being above the 

 middle of the ventral fin. The anal papilla is rather inconspicuous. In the upper 

 jaw the villiform teeth are in a broad arcuate band of almost uniform breadth, 

 occupying only the middle half of the whole jaw and without any dividing line 

 or empty space in the middle. They are very unlike the villiform teeth of the 

 lower jaw — which are situated in two divided horn-shaped areas with a smooth space 

 in the middle of the jaw, with their broad ends towards the middle. The teeth on 

 the palate are also villiform. They occur in two triangular patches not very far from 



