1768 
LIST OF THE AUSTRALIAN PALiEICHTHYES, 
far graver and more important question, namely, what 
differences are sufficient to constitute a family 1 Is the 
mere presence or absence of a nictitating membrane, a 
character which seems to be absolutely immaterial to the 
well-being of these fishes, unsupported by any other impor- 
tant differences, sufficient ? And if this question should be 
answered in the affirmative how can a scientist with any 
pretentions to consistency deny a similar rank to such 
specialized forms as the Hammer-headed Sharks (Sphyr- 
nina), the Hounds {Mustelina), and others among which 
Odontas^ns must be included. 
5. C. MACLOTi, 21. & H. Port Jackson, N.S.W, [Macleay Mus.). 
New Guinea {Giinther). 
6. C. GLAUCUS, Linn., sp. Tasmania {Giinther, Allport). 1 New 
South Wales (Tenison- Woods). 
7. C. GANGETicus, M. & 11. Poi’t Jacksou, N.S.W. {2facleay 
Mus.). 
*8. C. MACRURUS, R. & 0. Port Jackson, Botany and Broken 
Bays {Austr. Mus.), common. 
9. C. BRACiiYURUS, Gnth. Australia {Giinther). It is possible 
that the foetus from the Australian coast, mentioned by 
Dr. Gunther as being in the British Museum, may belong 
to the preceding species. 
10, C. MELANOPTERUS, Q. <L G. Torres Straits and Port Darwin 
{21acleay Mus.). Hobson’s Bay {McCoy, fide Castelnau, 
Proc. Zool. Soc. Viet. I. p. 217). 
*11. C. MENisoRRAH, M. & 11. South coast of New Guinea 
{Austr. Musi). 
Galeocerdo, Muller and Henle (1841). 
12. G. rayneri, 21cD. <L B. Port Jackson, common. The 
“Tiger shark,” This species abounds in our estuaries 
and creeks, and as it grows to a large size and is very 
fierce and cunning, it is much and justly dreaded. Most 
