HAMMER-HEADED SHAHK. C3 



Tlio ln-;i(l of tliis Sliark, — roprcscntatioii.s of the upper 

 and under surfuee of wliieli, on a small scale, arc given 

 below, — measured from one eye to the other, is very 

 large and Avidc ; the eyes are furnished with eye-lids, 

 whifh arise from the internal part of the orbits, the iridcs 

 arc golden yellow, the pupils black ; the nostrils are 

 elongated, and open immediately underneath the depression, 

 or notch, in the anterior margin of the laterally expanded 

 portions of the head ; the mouth semicircular, and furnished 

 with three, four, or five rows of teeth, depending upon the 

 age of the specimen ; these teeth are large, sharp, somewhat 

 triangular and curved, with smooth cutting edges when the 

 Shark is young, but serrated afterwards ; the teeth in the 

 upper jaw having their points directed towards the angle of 

 the mouth ; those of the lower jaw have the same direction, 

 but they arc narrower. 





ly 



The body is elongated, covered with a skin slightly gra- 

 nulated ; the colour greyish brown above, nearly white be- 

 neath : branchial openings five, all before the base of the 



