79° -Dr. watson’s Account of the Blue Shark. 
move upwards when they cover the eyes. It is furnifhed 
with five rows of teeth; thefe are triangular, and finely 
ferrated^. The body is of a fine blue colour, dark oa 
the back, lighter on the fides; the belly and all the under 
part of the fifh white; the fins and tail were of a dirty 
blue; the colour of the blue part is exactly reprefented 
by different fhades of indigo blue. When the head was 
placed downwards, a pretty large white pouch came out 
of its mouth, itlian fuppofes this to have ferved as an 
afylum to its young brood in time of danger. The 
length of the fifh from the tip of the nofe to the end of 
the tail was fix feet eight inches ; the length of the pec- 
toral fin one foot four inches: the fcale annexed to the 
drawing will give the meafurement of the other parts. 
It was a female, and weighed fifty-five pounds. An out- 
line of the under fide of the head is added, in order to 
fhew the fituation of the mouth. 
As I have never been able to fee an accurate drawing 
of this fifh, and as Mr. pennant, in his Britifh Zoology, 
willies a farther account may be given of it, I thought it 
not unworthy of the Society’s notice. The fifh itfelf was 
fluffed, and is now at the Britifh Mufeum. 
(a) I cannot afcertain how many rows of teeth belonged to each jaw ; they 
■ being feparatedby boiling before they were properly examined. 
