EXPI.ANATION OF PLATE III. 



Fig. I 



2 



4 

 5 

 6 



7 

 8 



9 



10 



II 



Mouths of Indian Trygonid^. 



—Internal view of mouth of Trygon microps (much reduced). 



T. uarnak (much reduced). 

 Hypolophus sephen (much reduced). 

 Trygon kuhlii. 



,, imbricata or walga. 



,, gerrardii. 



„ ziigei. 

 Urogymmis aspernmus (much reduced). 

 Trygon bleekeri (reduced). 



,, favus (much reduced). 



,, marginatus (much reduced). 



