Barhus. INDIAN CYPRINID^. 333 



bitar plates are narrow and nearly of equal breadth ; but in the Barbels the 

 head is compressed, and the suborbitar apparatus forms broad plates behind, 

 and narrow ones below the eyes ; and it is on this difference in the breadth of 

 the suborbitar and postorbitar plates that the length of the head in Barbels 

 depends. The lower jaw is equal in length with the upper, and is formed of 

 two lengthy bones having each a large pterygoid plate for the insertion of 

 proportionally large muscles for drawing the jaws together; the mouth is 

 horizontal, and at the chin the limbs of the lower jaw are soldered firmly 

 together, where they form a narrow but smooth symphysis. Fig. 6, t. 54, 

 represents the left ramus of the lower jaw of Barhus hexasticJms ; c, side view 

 showing the pterygoid plate, d under side ; a, point of union with its fellow at 

 the symphysis, b, articulating surface behind. 



I. — B. HEXASTICHUS, J. M. 



t. 39, f. 2. 



Cyprinus tor, Buch. Lobura of the Assamese. 



Head small, postorbitar plates equal to half the space between the eyes 

 and the maxillaries. The relative length of the head to the entire length is 

 as two to seven ; twenty -five scales are ranged along the lateral line, and six in 

 an oblique line from the base of the ventrals to the dorsum. The fin rays are, 



D.ll : P.17 : V.9 : A.8 : C.19. 



The three first rays of the dorsal are closely united and bony, the fins are 

 short, and with the exception of the pectorals the rays of which they are 

 composed are strong and coarse. The colour of the back, bases of the caudal 

 and dorsal are greenish grey, as well as the upper part of the head ; the rest 

 of the fish is reddish yellow, with the tips of the fins a more decided red. 



I found this species in Assam, and Buchanan met witli it in the large 



rivers on the western side of Bengal ; but the species he has figured for it in 



II h 



