BY J. DOUGLAS OGILBY. 
1769 
of the fatalities which from time to time horrify the com- 
munity, such for instance as that at Ryde and more 
recently in Lane Cove River, are in all probability 
attributable to this species ; and I am glad to have an 
opportunity of reiterating in this publication ray convic- 
tion, recorded previously in several Sydney newspapers, 
that in view of the many deplorable fatalities which have 
occurred within the last few years, and of the excessive 
number of sharks known to infest the waters of our 
harbour and its tributaries, it is the plain duty of the 
Government to offer a substantial reward for every large 
shark killed within its jurisdiction, always providing that 
the dangerous natiire of each individual specimen be 
certified to by some competent person, so that a repetition 
of the Victorian fiasco, mentioned by Prof. McCoy (loc. 
cit.), may be avoided; and I am the more impressed with 
the necessity for a measure such as this which I have 
briefly sketched, since the prevalence of these pests is 
undoubtedly due to the reprehensible system now in 
vogue of discharging the refuse of slaughter-houses and 
such like rubbish by means of lighters towed down the 
harVjour, which, having been emptied of their load some 
distance outside the Heads, are immediately, while reeking 
with Vjlood, brought back up the harbour, and are followed 
by these keen-scented denizens of the ocean as naturally 
and as easily as hounds follow the trail of a fox. 
Galeus, Cuvier (1817). 
13. G. AUSTRALIS, J/cL Coast of New South Wales, north- 
ward at least as far as Port Stephens, common. Hobson’s 
Bay, Vic., common {McCoy). Tasmania {Johnston, as G. 
canis). The “ School Shark ” of Sydney. 
Sphykna, Rafinesciue (1810). 
14. S. zyg.ena, Linn., sp. East and soutli coasts of Australia ; 
Tasmania. The “Hammer-headed Shark” or “Balance- 
fish.” The generic name Zyyvcna was first applied to a 
