RESTORATION OF EURY ZYGOMA DUNENSE. 
201 
RESTORATION OF EURYZYGOMA DUNENSE. 
By Heber A. Longman, Director, Queensland Museum. 
(Plates XXX-XXXI). 
A restoration of Euryzygoma clunense , modelled by Mr. Wilfrid Morden, 
illustrated in Plates XXX-XXXI, has been placed on exhibition in the Queensland 
Museum. The remarkable cranium on which the genus Euryzygoma was established 
by the writer in 1921 1 was found at a depth of about 70 feet, during 
the sinking of a well on the property of Mr. G. A. F. Kleidon, Brigalow, 
Darling Downs. Supplementary material was recorded in 1929. 2 The specific 
name dunense was given by De Vis hi 1887 to mandibles which he associated 
with Nototherium. 
Although most attempts at reconstructions from incomplete remains are 
necessarily provisional and inadequate, the writer has pleasure fin publishing 
illustrations of Mr. Morden’s restoration of this very specialised and extra- 
ordinary marsupial. The outstanding features of the skull are the inferior 
lateral processes of the anterior part of the zygomata and the contours of the 
prominent suborbital platform. The maximum width of the skull (680 mm.) 
actually exceeds the maximum length (634 mm.), a most unusual characteristic 
among mammals. The lateral extensions relatively exceed the dependent 
processes of the malar in such Entelodonts as Megachccrus, described by 
E. L. Troxell. 3 
In the original description, it was tentatively suggested that the extra- 
ordinary development of the zygomatic arches was associated with the presence 
of large cheek pouches, and no more satisfactory explanation of these curious 
processes can be made to-day. Although allied to species of Nototherium , 
Euryzygoma evidently represents a very specialised offshoot from this group of 
bulky herbivorous marsupials. 
The restoration of the head was definitely built up on the actual contours 
of the fossil cranium (Plate XXX, fig. 2). Careful measurements were made 
and the proportions worked out in detail. The body contours are mainly 
based on the proportions of the skeletons of allied species of Nototherium with 
some reference to Dijorotodon, 
1 1921. Longman, Mem, Qkl. Mus., vol. VIT, pp. 65 80. 
2 1929. Longman. Mem. Qlcl. Mus., vol. IX, p. 247. 
3 1920, Troxell, Amer. Journ, Sci,, 4th ser, ? yoj. 50, p. 433. 
