OCCURRENCE OF A SUBMERGED FOREST. 185 
that the Pacific Ocean and the Australian land have changed their 
respective levels by as much as fifteen feet, since the existence of 
Neolithic man at Botany Bay. 
We desire to gratefully acknowledge the courtesy of Mr. Cecil 
W. Darley, M. Inst. C.£., in placing his offices at our disposal and 
allowing his officers to assist us; and we are also indebted to him 
and to Mr. McLachlan, Under Secretary for Mines and Agricul- 
ture, for the loan of the stone tomahawks dug up at Shea's Creek. 
We also acknowledge the services rendered us during our explor- 
ation of Shea’s Creek by Mr. A. 8. Patison, the surveyor locally 
in charge of the work, and by Mr. W. Trickett, the overseer, and 
for much important information communicated to us by them. 
We are under a special obligation to Mr. J. Jennings of the 
Australian Museum for the naming of the shells, and to Mr. R. 
Baker of the Technical College for determining the various kinds 
of timber taken from the different stumps of the submerged 
forest. We also beg to thank Mr. W. F. Smeeth for his pre- 
paration of the microscopical sections of the Dugong bones, which 
has proved no light task, and to Mr. Whitelegge of the Australian 
Museum for the photographs exhibited showing the excavation 
at Shea’s Creek. We also have to thank Mr. Halligan for kindly 
supplying sections of the Rickety Street Bridge bores, and Mr. 
H. E. C. Robinson for preparing the enlarged diagrams to illus- 
trate this paper. 
_ CORRIGENDA. 
Page 159, line 8, delete ‘and Commodore Charles Wilkes, U.S.N.’ 
” ne 9, for ‘were,’ read ‘ ; 
” line 10, for ‘They state,’ aad * He states.’ 
