Tetrodon. gangetic fishes. 5 



The nostrils are situated nearer the eyes than the end of the 

 head. On each side two parallel rows of punctures run from 

 the nape to the first aperture for breathing. Before each 

 eye there is another row, in form of a crescent, with the horns 

 turned towards the sides of the head. 



There is no longitudinal furrow on the tail. 



The insertion of the caudal Jin above is much shorter than 

 below. The hinder dorsal Jin is much smaller than the anal, 

 and is shaped somewhat like a sickle. 



2d Species. — Squalus pectinatus. 



A squalus with a long bony snout, armed on each side with 

 about 34 narrow teeth. 



Pristis pectinatus, Transactions of the Linnaean Society, Vol. 

 II. p. 278. 



Saw-fish of the English. 



This animal is said by the fishermen to grow to the length 

 of from six to seven and a half feet, and to live entirely on 

 weaker fishes. It would be needless to describe farther a fish 

 already well known to the naturalist.. 



III. Genus. — Tetrodon. 



Fishes of the first order having projecting jaw-bones, each 

 divided as it were into two teeth, but there are no real teeth ; 

 and having no scales ; but the body is slimy, and is capable, at 

 the will of the animal, of being inflated. 



The fishes of this genus are eaten by the poor, but are con-^ 

 sidered as indifferent food ; nor does their quantity any where 

 occasion them to be of any importance. 



All the species described below have five Jins, of which the 

 dorsal is placed far back opposite to the anal ; and the pectorals, 



