in the Fish Gallery of the Indian Museum. 70. 



spines are so numerous and so strong as to resemble 

 those of a hedgehog. All the Tetrodonts can inflate 

 their gullet, and so their abdominal cavity, like a balloon, 

 and many of them can make a croaking sound. Both 

 Tetrodon and Diodon occur in the Atlantic and Mediter- 

 ranean as well as in the Indian and Pacific Oceans, 

 and one species Diodon hysirix is common to all these 

 regions. Chilomycterus belongs to the Atlantic and the 

 Indo-Pacific. 



3. Subfamily Molina. The Sun-fishes have a most 

 singularly abbreviated, round or oval, disk-like body. 

 They are pelagic fish and occur in all tropical and 

 temperate seas, and they grow to a great size. One 

 species is said to occur in Indian waters. The jaws of 

 the Sun-fish, like those of the Triacanthines, are weak. 



Order II. GANOIDEI [Cases 26-29]. 



The second order of the Subclass Teleostomi contains 

 the Ganoid fishes, bat as none of these fishes are known 

 to occur in India we shall postpone their consideration : 

 moreover, their position in the Class of Fishes will be 

 better understood after we have considered the subclass 

 Chondropterygii. It will be sufficient, for the present, to 

 say that the Ganoids, in a general way, are remote 

 cousins to the Sharks and are the ancestors of the Bony 

 fishes, and that they are therefore, in this sense, inter- 

 mediate between the Teleostei and the Chondropterygii. 



Subclass CHONDROPTERYGII [Cases 30-41]. 



This subclass contains the Sharks, Rays and Chi- 

 meeras, of which the first two groups are well represent- 

 ed in the seas and estuaries of India. 



