Barbus. 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 Barbus hexastichus ; ec, side view 
showing the pterygoid plate, p under side; a, point of union with its fellow at 
the symphysis, 6, articulating surface behind. 
].—B. HEXASTICHUS, J. M. 
tS0t. 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, 
DT EL? sv 0: ACs: C19: 
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 with it in the large 
rivers on the western side of Bengal; but the species he has figured for it in 
Hh 
