HVnniER-HKADRD SMAHK. 



(11 



CIIOKDROPTERYGU. 



squalida:. 



!)j): 



THE HAMMER-HEADED SHARK. 



Zi/ga'7ia malleus. Val. 



Zygcena, Belon, p. 61. 



RONDELET, 1554, p. 389. 

 Marteau, ,, 1558, p. 304. 



Zygcena, Salvianus, tab. 40. 



,, Salviani, Willoughby, p. 55, B. 1. 



Squalus zygctna, Linn. Syst. Nat. t. i. p. 399, sp. 5. 



,, ,, DuiiAMEi., sect. IX. pi. XXI. fig. 3. 



Squale marteau, Lacepede, t. i. p. 257, 4to. edit. 



,, ,, ,, t. V. p. 443, 8vo. edit. 



,, ,, Risso, Iclit. p. 34. 



Zygocna malleus, ,, Hist, p. 125. 



,, ,, Val. Mem. du Mus. t. ix. p. 222. 



Generic CIturacters. — Head depressed, more or less truncated in front, tiie 

 sides extended horizontally to a considerable lengtli, witli the eyes at the 

 external lateral extremity. Teeth of the same shape in the upper and lower 

 jaw, viz. the points directed towards tiie corner of the mouth, with a smooth 

 edge when young, but distinctly serrated in adult specimens. Branchial open- 

 ings five. Two dorsal fins, the first in a line close behind the pectorals ; the 

 second over the anal fin. 



