194 THE NATURALIST IN AUSTRALIA. 
individual of Callorhynchus shares with Chimera the possession of a peculiar hinged 
spinous process, which is developed from the centre of the forehead. The true 
significance of this peculiar organ has never, as yet, been satisfactorily determined. 
The writer is disposed, however, from an examination of it in living fish, to believe 
that it is employed during the mating season as a grasping organ. The slender 
cartilaginous proboscis of the female of Callorhynchus, or the whip-like tail of that of 
Chimera, furnish, in either instance, fulchra which can be tenaciously grasped ‘by 
the organ in question. 
W. Saville-Kent, Photo, 
PORT JACKSON SHARK, Cestracion Phillipi, p. 192. ONE-TENTH NATURAL SIZE. 
