OWEN NOTOTHERIUM. 185 



(ih. figs. 1 and 2), and the right ramus of the under jaw (Plate IX. 

 fig. 3) (in the Natural History Museum at "Worcester), which 

 form the chief subjects of the present communication, belong to one 

 and the same genus, for which, according to the title of priority, the 

 name of Nototherium must be retained. 



The entire cranium, the portion of the upper jaw, and the almost 

 entire lower jaw belong to the larger species, or form, of Nototherium 

 which I have called Not. MitchelU. The right ramus of the under 

 jaw (Plate IX. fig. 3), and the upper jaw, with the molar series on 

 each side, of which a cast has also reached the British Museimi, belong 

 to the smaller species, or form, called Nototherium inerme. It remains 

 to be seen whether this may not be the female, and the larger form 

 the male, of the same species of Nototherium. The difference of size 

 between the two sexes of the Kangaroos renders the above conjec- 

 ture extremely probable. 



I subjoin the determinations of forty-eight specimens of Austrahan Fossils, 

 transmitted, at the suggestion of the President of the Geological Society, for my 

 examination, from the Museum of the Natural History Society of Worcester, by 

 the liberality of the Council of that Society. These specimens were collected* by 

 Mr. Hughes, in Darling Downs, and exemplify the richness of the fossil evi- 

 dences of Mammalia, and the association of particular genera in one limited 

 locality. 



List of Mammalian Fossils from Australia in the Museum of the Natural 

 History/ Society of Worcester. 



1. Upper jaw of Macropus Titan, mas. 



2. Lower jaw of Macropus Titan, fcem., left ramus. 



3. Lower jaw of Macropus Titan, right ramus. 



4. Lower jaw, Macropus Atlas, foem. 



5. Kight humerus, Macropus Atlas. 



6. Lower jaw, Macropus Ajax. 



7. First ] 



8. Second I phalanges of the middle toe of fore foot of Macropus Titan ? 



9. Third J 



10. Bight acetabulum and part of pelvis of Macropus Titan ? 



11. Right acetabulum and part of pelvis of Macropus Atlas? 



12. Right acetabulum of Macropus Anak. 



13. Lower jaw, Macropus Anak. 



14. Left humerus, Macropus. 



15. Shaft of part of right tibia, Macropus Titan? 



16. Upper part of shaft of right femur, Macropus Titan? 



17. Metatarsus of largest toe, hind foot, Macropus Titan? 



18. Proximal phalanx of ditto, Macropus Titan ? 



19. Proximal end of right tibia, Macropus Atlas. 



20. Part of shaft of right tibia, Macropus Atlas. 



21. Distal end of right tibia of Macropus Titan. 



22. Distal end of right tibia of Macropus Titan, mas. 



23. Distal end of left tibia of Macropus Atlas ? 



24. Caudal vertebra, Macropus Titan ? 



25. Caudal vertebra, Macropus Titan ? 



26. Part of left ramus of lower jaw of Diprotodon au^traUs. 



27. Part of upper jaw of Biprotodon australis. 



28. Part of right ramus, lower jaw, Nototherium inerme. 



29 . Part of right ramus, lower jaw, Diprotodon. 



30. Part of right ramus, lower jaw, Diprotodon. 



31. Portion of acetabulum, Diprotodon? 



32. Part of a molar tooth, Diprotodon. 



VOL. XV. PART I. O 



