14 ] 
RECORDS OF IV. A. MUSEUM. 
Tachyglossus {Echidna), aculeatus, var. typicus, measurements : — 
Owen’s 
E. Hystrix. 
Length 
Inches, 
2 
Lines. 
Breadth (proximal end) 
I 
— 
,, (middle of shaft) . . 
— 
4 
,, (distal end) 
I 
9 
Thickness of middle of shaft 
— 
3i 
Mammoth Cave 
Specimen. 
Inches. Lines. 
2 3 
1 3 
— 5 
2 
4i 
It will be seen from the above table that there is an all round 
increase in size over the specimen that supplied Professor Owen’s 
measurements ; such an increase as would easily be accounted for 
by the greater size of an individual of the same species. A most 
careful examination of this specimen and a comparison with Owen’s 
three figures disclose two points of difference, the greater size, in 
regard to the whole bone, of the process known as the “ tricipital ” 
which forms the termination of the “ teretial ” or “ posterior 
tricipital ridge ” that runs along the radial border of the humerus 
from the ento-tuberosity, and secondly the greater comparative 
depth of the “ ulnar trochlea ” at the distal end of the bone. Both 
these features are of little importance as they would most likely 
become accentuated as the animal increased in age and size. 
It is an interesting fact that the days which saw the Diprotodon 
and Nototherium in the south-west of this State, also saw this 
ant-eater’s range much more extended than at the present time. 
