A NEW DINOSAUR. 
1.41 
Dinosaur is tentatively placed in the family Cetiosauridae, as a specialized 
member, allied to Pelorosaurus. As Riggs’ Brachiosauridae was primarily 
established on the relative dominance of the fore limb, additional evidence will 
be required before it can be affined with this series. 1 2 
Austrosaurus does not appear to be closely related to either Getiosaurus, 
Cetiosauriscus, or Haplocanthosaurus, which are placed by von Huene in the 
sub-family Cardiodontidae. Hatcher- regards the last-named genus as represent- 
ing " the most primitive Sauropod known ” (p. 45), but he records that the 
" vertebras show numerous large intramural cavities instead of the close, though 
cancellous texture ” of Getiosaurus (p. 53). 
With the few fragments available, the author is diffident in doing more 
than suggest, at present, the affinities of this new Cretaceous Dinosaur. 
Attempts to solve problems of phylogeny can be best made by those who 
have had opportunities of examining the mass of material stored in European 
and American Museums. It is believed, however, that the intramural complex 
of the vertebral centra exhibits diagnostic characters to which greater attention 
should be given. The greatest development of what may be called the crypto- 
camarilla n type is found in the posterior dorsals, whilst the phancrocamerate or 
open-chambered type of centra obviously reaches its maximum of evolution 
in the cervicals of specialized species. 
Many genera that are now well known were first described from very 
fragmentary specimens. In view of the special interest attached to this great 
group of Sauropodous Dinosaurs and the study of their rapid evolution 
throughout Jurassic and Cretaceous times, it is hoped and anticipated that 
supplementary material will be forthcoming of this giant Queensland rejitile. 
Additional interest is given to the study of these giant reptiles by the 
point raised by H. Fairfield Osborn, who considers that the Upper Jurassic 
Lower Cretaceous migrations of the Sauropoda, probably from a Central Asiatic 
stock, into all the continents, shed light on the adaptive radiation of mammals. 3 
Dimensions. — Taking the anterior part of the sacrum as representing the 
central part of the vertebral series, as is characteristic of most of these giant 
Sauropodous Dinosaurs, and taking the average of dorsal and cervical vertebrae 
.for the group as being twenty-five, a tentative estimate of the length of one 
of these great reptiles can be made from a single vertebra. In a Dinosaur 
of the Brachiosaurus type excavated by F. W. H. Migeod for the British 
Museum at Tendaguru in 1930, the length of the dorsal vertebrae varied from 
nine to fourteen inches, and allowance must be made for regional variation. 4 
1 Riggs, E. S., Field Columbian Museum, Geol. Ser., Vol. II, No. 6, 1904. 
2 Hatcher, J. B., Mem. Carnegie Mus., II., No. 1, 1903. 
3 Osborn, H. Fairfield, Rep. Brit. Assn., 1931, p. 389. 
4 Migeod, F. W. H., Natural History Magazine, Vol. Ill, No. 19, 1931, p. 92. 
