U 



S1X-GILLED SHARK. 



upper jaw, and to the lower five; and he adds that the 

 central inferior teeth are sharp and conical; by which I under- 

 stand him to say, that at the symphysis, between the lateral 

 arrangements of flat serrated teeth he made out two or more 

 of what I had supposed to be a single bifid tooth. It is probable 

 he is correct; but they are pressed closely together, and 

 erect, so that their exact structure cannot be ascertained with- 

 out some degree of mutilation. 



Both the British specimens here referred to are now added 

 to the stores of the British Museum. 



HEAD OF SIX-GILLED SHARK. 



