I9I4.] 



R. B. Seymour Sewell : Notes on Indian Fish. 



J33 



which is bounded externally by an oblique row of plates converg- 

 ing in the direction of the base of the tail. On the ventral surface 

 the space between the pelvic lin and vent is occupied by seven 

 large plates, a central one surrounded by the six others. The 

 plates are in contact. The subopercular spine is relatively large 

 and tetrafid" (lyloyd). 



The nasal spine arises, in this species, from a point opposite 

 the upper border of the eye. at the junction of the dorsal surface 

 and snout, and points strongly upwards and somewhat forwards; 

 from its point of origin the dorsal profile at once slopes downwards 

 and backwards. 



The floor of the tentacular pit, below the spine, is vertical as 

 also is the line of profile of the snout, so that when the animal is 

 viewed from below, the pit cannot be seen. 



The interorbital region narrows only very slightly, if at all. 



In the Indian Museum there are fifteen specimens obtained at 

 the following " Investigator" stations: — 



Further differences between these two species can be seen bj'' 

 comparing their measurements and ratios : — 



