320 



A COURSE ON ZOOLOGY. 



FIG. 277. The conger eel in commonly 



called the sea-eel ; it attains 

 a length of from three to six 

 feet and is sometimes much 

 longer. The gymnotus, or elec- 

 tric eel, has the general form 

 of ordinary eels. It is about 

 six feet long, and possesses a 

 powerful electrical apparatus, 

 capable of communicating a 

 violent shock to very large 

 animals. It is found in the 

 rivers and marshes of South 

 America. 



Lophobranchii and plectognathi. These two orders are 

 interesting to us chiefly on account of the strange forms 



Fia. 278. 



HIPPOCAMPUS ANTIQUORUM. 



A, globe-fish (Diodon maculatus) ; B, the same inflated. 



