250 



In the year 1845 I received from the accomplished and determined, but unfortunate 

 explorer of Australia, LuDWIG LEICHHABDT, a fossil mandibular ramus of a young Noto- 

 there, showing the germ of an incisor which, in adult specimens subsequently acquired, 

 proved to be a tooth of temporary growth with crown and fang distinct, as in Macropus, 



Fig. 1. 



Inner side of hind half of left mandibular ramus of Nototherium Mitchelli nat. size), " On Extinct Mammals 

 of Australia," Ileports of the British Association for the Advancement of Science, vol. for 1844, pi. iv. fig. 3. 



as will be shown in a subsequent part of the present section. One of these adult 

 specimens included both rami, contributing satisfactory additional evidence of the 

 characters of Nototherium Mitchelli. It was part of the series of fossils collected at 

 King's Creek, Darling Downs, in 1845, and transmitted to London by Mr. Bexjamin 

 Boyd, where it was purchased by the Trustees of the British Museum, along with the 

 cranium and lower jaw and other instructive parts of the skeleton of Dijirotodon, described 

 and figured in the preceding section, pp. 189-248. 



A portion of maxilla with upper molar teeth of Nototherium Mitchelli also formed 

 part of this purchased series. 



In 1856 there was discovered in the same locality the skull, wanting the lower jaw, 

 of Nototherium Mitchelli. This unique and valuable specimen came into the possession 

 of Frederic Neville Isaac, Esq., by whom it was presented to the Australian Museum, 

 then in course of formation in Sydney, New South "Wales. 



William Siiarpe Macleay, Esq., F.R.S., originator of the Quinary System and author 

 of works and monographs which gave great stimulus to the progress of philosophic 

 zoology, published a notice of this remarkable fossil, naming it Zyyomaturus trilohus, in 

 a "lleport on Donations to the Australian Museum during August 1857," whiGh 

 appeared in a Sydney newspaper of that date. 



