^4 
51X-OILLED SHARK. 
upper jaw, and to tlie lower five; and lie 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-OILLED SHARK, 
