248 ] 
RECORDS OF W.A. MUSEUM. 
which is approximately twice the length, the least diameter in the 
same direction is 9.5 mm., the other dimensions of the shaft are in 
proportion. 
On account of this striking characteristic noted in all the bones 
at present collected, and of its excess in size over the largest known 
forms, it is proposed to regard this animal from the Mammoth Cave 
as the type of a new species to which tne name of Zaglossus hacJictii 
has been given, in honour of Sir J. YVinthrop Hackett, K.C.M.G , 
etc., the President of the Board of T rnstees, as a slight acknowledge- 
ment of his generous support which alone rendered the exploration 
of these caves possible. 
Order MARSUPIALIA. Sub-Order POLYPROTODONTIA. 
Family Dasyuridae Sub-Family Dasyurinae. 
Thylacynus, Temm. (1827) 1 
THYLACYNUS CYNOCEPHALUS, Harris 
(1808) 2 
THE TASMANIAN WOLF OR TIGER. 
An interesting specimen from the upper layer 3 in the 
Mammoth Cave consists of an almost complete left mandible with 
four cheek teeth in position. Of these teeth two premolars, P3 and 
P4 have been subjected to a certain amount of wear ; the molars 
mi and m2 are missing, but m3 is present, rising from its alveolus, 
and the last cheek tooth 1114 is still in its formative cavity. 
The general outline of the ramus is similar to that of Thylacynus; 
it is slender and is slightly curved horizontally with its convexity 
downwards. , 1 he coronoid is short and delicate with a thickened 
anterior margin, the angle of the jaw is large, broad and prominent. 
The condyle is strong, broad transversely and has its upper surface 
below the line of the crests of the teeth ; it is separated from the 
coronoid by a deep notch. 
1 Mon : Mammalogie, Vol. I, 3® Mon : pp XXIII, 23-24 footnote, 267, pi. 7, 
figs. 1-4 , on pages 60-65 of the same volume the spelling is Thylacinus. 
Trouessart Cat. Mamm. Vol. II, p 1216 (1898/9) does not include the 
form Thylacinus in the synonymy of the genus Thylacynus, regarding 
it as a misprint. 
•2 Trans. Linn. Soc. IX, p. 174, pi. 19 (1808). 
a vide ante p. 12. 
