128 The American Nataralitt. [FeWy , 



uridaj. The structure of the pelvis approximates that of a num- 

 ber of the Edentata, as do apparently the inferior incisor teeth. 

 The origin of the latter 'order has yet to he discovered. 



The existence of a South African type of placental mammal 

 in Australia need not greatly surprise us, since the fresh water 

 fish Gonorhynchus greyi is common to both com dries, ami the 

 ratite birds and pleurodire tortoises are found in both. 



Explanation of Plates. 



Copied from Prof. Stirling's Memoir in the Transactions of 



the Linnean Society of South Australia. 



Plate IX. 



Notoryctes typhlops Stirling, natural size, side view. Fig. 2, 



muzzle from front, 



Plate X. 

 Notoryctes typhlops, skull and dentition enlarged. Fig. 1, skull 

 side view. Fig. 2, lower jaw from behind. Figs. 3-6, superior 

 molar from within, without, from front, and from below. Figs. 

 7-10, inferior molar, from within, without, above, and obliquely. 

 Fig. 11, skull from below. 



