THE 
ROUND-HEADED ZYG^NA. 
Generic Character, 
Spiracles five, on each fide the neck. 
Month fituated beneath, in the fore part of the 
head. 
Body oblong, fomewhat cylindric. 
Specific Character, (s'c. 
SHARK with very broad fubtriangular head, 
rounded in front. 
The ROUND-HEADED ZYGyENA. 
PANTOUFLIER. 
Broujfon adl, Paris. 1780. p. 662. n. 12. 
The Squalus Tiburo, which is extremely nearly 
allied to the Squalus Zygaena or Hammer-Headed 
Shark, differs from that fpecies principally in the 
form of its head, w'hich, inftead of being produced 
on each fide into a long procefs, is rather of a fub¬ 
triangular appearance, rounded off in front. It is 
a native of the South American feas, and is a much 
rarer fpecies than the Squalus Zygaena, of which it 
has been fometimes confidered as a variety. 
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