On the Jaw of the Diprotodon Australis. 
387 
C. East Coast of Tasmania. 
Rocks of the paleeozoic formation, chiefly sandstones, are found 
at various points of the eastern coast, but greatly broken and 
obscured by the usual greenstone ranges and local exhibitions of 
other trap rocks. In Maria Island are limestone quarries which I 
did not visit, but from which I procured fossils, among which were 
some of the large Pachydomi, of precisely the same species as 
those from Wollongong in New South Wales. 
At Spring Vale, about ten miles above Great Swan Port, is a 
patch of palaeozoic rocks, not more than a mile or two in extent, 
forming a low gently undulating ground surrounded by hills of 
igneous rock. No section is exhibited, but blocks of the rock 
protrude through the soil. It is a fine compact quartz rock, 
charged with the usual fossils of the formation in great abundance. 
The rock reminded me strongly of the quartz rock of the Lickey 
Hill. The fossils of this locality were_ 
Fenestella ampla. Spirifer Stokesii. 
, r _ 0( jucta rugata ? - crassicostatus, sp. nov. 
Spirifer radiatus. __ nt i,p rs 
- Darwinii. Stem of a Crinoidal animal. 
- lasmaniensis. 
Art. XXXI. On the jaw of the Diprotodon Australis, and its 
dental formula. By Edmund C. Hobson, M.D.* 
( With a Plate.) 
The fossil remains of the Diprotodon Australis have hitherto 
been found in so detached and mutilated a condition as to render 
the dental formula of this huge marsupial little better than con¬ 
jecture. This desideratum has, however, been to a certain extent 
supplied by the half of an inferior maxillary bone recently disco¬ 
vered in the tertiary lacustrine deposits of Mount Macedon 
(Port Phillip). 
* It is with feelings of the deepest regret we have to announce that since the receipt of 
tills paper (the last from his pen) its very talented author died at Melbourne, at the early 
age of thirty-four.- Eo. Tasmanian Journal. 
