504 



SQUALIDE. 



CHONDROPTERYG1I. 



SQUAL1D.K. 



THE HAMMER-HEADED SHARK. 



Zygana malleus. Val. 



Zygcena, BELON, p. 61. 



RONDELET, 1554, p. 389. 

 Marteau 1558, p. 304. 



Zygcena, SALVIANUS, tab. 40. 



,, Salviani, WILLUGHBY, p. 55, B. 1. 

 Squalus zygcena, LINN. Syst. Nat. t. i. p. 399, sp. 5. 



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



Squale marteait, LACEI>EDE, t. i. p. 257, 4to. etlit. 



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

 ,, ,, Risso, Icht. p. 34. 



Zygcena malleus, ,, Hist. p. 125. 



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



ZYGOSNA. Generic Characters. Head depressed, more or less truncated in 

 front, the sides extended horizontally to a considerable length, with the eyes at 

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

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

 edge when young, hut 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. 



IN the sketch of the Natural History of Yarmouth and 

 its Vicinity, by C. J. and James Pagct, which I have fre- 



