214j UK. B. A. BENSLEY ON THE EVOLUTION 



18956. Thomas, M. R. O. On Ccenolestes, a still-existing Survivor of the Epanortliidte of Amegliino, 



and the Representative of a new Family of Recent Marsupials. Proc. Zool. See. Loudon, 



pp. 870-878. 

 i8q7. Tomes, C. S. Note on the Minute Structure of the Teeth of Notoryctes. Proc. Zool. Soc. 



London, pp. 409-4.12. 

 1876. Wi^LLACE, A. R. The Geographical Distribution of .Vuimals. 2 vols. 8vo. New York. 

 1836. Waterhouse, G. R. Description of a new Genus of Mammiferous Animals from Australia, 



belonging probably to the Order Marsupialia. Trans. Zool. Soc. London, vol. ii. (18tl) 



pp. 149-154. 



iS^.6. A Natural History of the Mammalia. Vol.1. Marsupiata. 8vo. London. 



1897. Wilson, J. T., and J. P. Hill. Observations on the Development and Succession of the Teeth 



in Perameles, kc. Quart. Journ. Micr. Sci. vol. .\xxix. n. s. pp. 427-588. 

 1882. WiNGE, H. Om Pattedyrenes Tandskifte, isaer med Heusyn til Taendernes Former. Yid. 



Medd. f. d. Naturh. Foren. (Copenhagen), pp. 15-67. 

 1888. Jordfunde og nulevende Pungdyr fra Lagoa Santa, ^linas Geraes, Brasilien, med Udsigt 



over Pungdyrenes Slaegtskab. Aftryk af " E Museo Lundii." 4to. (Copenhagen.) 

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EXPLANATION OF THE PLATES. 

 Plate 6. 



Illustrating the patterns of the upper teeth. 



Note. — In the preparation of Plates 5 and 6 the figures have been arranged, wherever convenient, 

 in lines indicative of adaptive sequence, and numbered accordingly. No attempt has been made 

 to represent the relative sizes of the teeth, those of the smaller forms having been enlarged to a 

 much greater extent than those of the larger ones for the purpose of illustrating, to the best advantage, 

 the peculiarities of their patterns. In all of the crown-views the uppermost margin of a figure 

 represents the anterior side, and the left-hand margin the internal side. In the profile views the 

 left-hand margin represents the anterior side. The external profile is represented throughout in the 

 upper molars and premolars, and the internal profile in the lower; molars (except PI. 6. figs. 14 & 15). 



The numbers given in brackets are those by which the figured specimens are designated in the 

 registers of the British Museum. 



rig. 1. Peratherium sp. Right in. 2 reversed. a, crown ; b, profile. (Lower Miocene, Antoign : 

 No. 27807.) 



2. Sminthopsis leucopus, Gr. Left »i. 2. a, crown ; b, profile. (No. 52. 1. 13. 3.) 



3. Dasytirus viaculuius, Kerr. Left m. 2 and vi. 3. (No. 983 b.) 



4. Sarcophilus ursinuK, Ilarr. Left w. 2 and m.'6. (No. 42 b.) 



5. Myrmecobiusfasciatus.Vf aXtrh. Left ni. 2 and m. 3. a, crown ; b, in. 3, profile (No. 76. 11. 27. 3) ; 



c, left m. 2, crown (No. 44. 1. 22. 21). 



6. Tkylacinus cynocepha/us, Ilarr. Left »i. 3. (No. 65. 10.9. 17.) 



7. Thylacinus spelceus, Owen. Left m. 2. (No. 438S7.) 



