234 FISHES OF AUSTRALIA. 



The jaws and teeth are of a very striking- nature, as 

 will be seen from the accompanying illustration, while the 

 large oval egg-cases with their spiral outer covering ending 

 in long tendrils, are, perhaps, amongst the most striking of 

 Nature's works. 



Fig. 84. Teeth of PORT JACKSON SHARK (Heterodontus philippi). 



The four or five species of these "Bullheads" at present 

 existing are the only surviving representatives of a family 

 of Sharks, shewing very ancient primeval characters, and 

 which are numerously represented in certain geological for- 

 mations. The fossil forms far exceeded in size all of the 

 existing species. 



The dentition is adapted for the mastication of hard- 

 shelled crustaceans, mollusks, and echinoderms, upon which 

 (particularly the last-mentioned) they principally subsist. 



The Port Jackson Shark is very abundant in Port 

 Jackson and along a great part of the Australian coast, 

 being found also in New Zealand. 



The Wobbegong : This hideous-mouthed creature 

 attains a large size ; individuals of 10 feet in length being not 

 uncommon. It is often called Carpet-Shark, on account of 

 the beautiful carpet-like pattern displayed over the skin. 

 This colouration, coupled with the presence of peculiar 

 skinny, weed-like appendages on the head and round the 

 mouth, give it a most-decided resemblance to its surround- 

 ings. And this is necessary, as this fish is not of a roving 

 disposition, but lies quietly amongst the weeds and rocks, 

 calmly waiting for some "food" to come by. It is described 

 by fishermen as an "ugly-looking brute" and certainly it has 

 a most horrific aspect. 



