184 PROCEEDINGS OF SECTION C. 
generalised form, neither distinctly polyprotedont nor dipro- 
todont. Muddy Creek has yielded a ramus of the lower jaw 
of a teothless whale. This was obtained by Mr. G. Sweet 
from the -polyzoal rock which forms the base of the lower 
series usually spoken of as Eocene. The Mystacocete 
whales are not definitely known in the Northern Hemis- 
_ phere till Pliocene times. But Lydekker (Lydekker,, $3) 
records a European genus, Cetotherium, oue of the Balae- 
nidae, from the Chubut deposits of Patagonia, and speaks of 
the beds as not later than Miocene, while they may possibly 
be Upper Hocene. This would appear to point toasouthern 
origin for at anyrate some of the Cetacea. In the same 
paper Lydekker propounds a new genus, Prosqualodon, 
having teeth like Squalodon, but differing in number, and 
showing cther peculiar, characters in the skull. There is 
nod reason why Sgualoden wilkinsoni, M‘Coy, from our 
“ Eocene’ should not be referred to this southern and older 
genus, for only a couple of detached teeth seem to be known. 
The other whale records are more satisfactory. 
A few generic and even specific identificaticas cf sharks 
have been made, actably Carcharodon ungusiidens anc U. 
megalodon, which occur, though rarely, in the Eocen: of 
the Northern Hemisphere, but are characteristicaliy Miocene. 
The above hasty survey of our Lowest Tertiary fauna 
shows, as many authors have pointed ovt, some strange 
abnomalities. Some forms have a distinctly Mesozoic aspect, 
it may b2 Cretaceous, or even Jurassic, others are distinctly 
Eocene, others again point to a. Miocene or Pliocene ‘age, 
while running through ail is a strong dash of southern blood. 
SouTHERN ORIGIN OF CERTAIN Forms. 
It has already been pointed out that the survivals in our 
Recent fauna exercised a powerful influence on the opinions 
of the older zoologists, and it became almost an article of 
faith that everything here had a false appearance of anté 
quity. Gradually however it has been shown that many 
forms of life, both of plants and animals, had a southera 
origin, and consequently we arrive at the possibility that 
certain forms which in the north are late Tertiary really 
had a higher antiquity at the Southern Antipodes. For 
instance, Osborne (Osborne, ’00) is of opinion that the 
Hyracoidea, Edentates, and perhaps Proboscidea, originated 
in Neogaea and passed over to Africa, and so to Europe ; 
while Notogaea was the chief point of radiation of the mar- 
supials which passed thence to Neogaaa. 
