786 



PROF. BALDWIN SPENCER ON A 



[Nov. 20, 



groove there is in the fossil is only as broad as the deep depression 

 which lies between the condyles posteriorly ; starting from this it 

 runs in a slanting direction towards the external side, separating 

 a larger internal rounded eminence from a smaller external 

 one '. 



Fig. 1. 



Fig. 2. 



Wynyardia hassiana. 

 Fig. 1. — Portion of right femur. 

 Nat. size. 



Fig. 2. — The same. Upper ex- 

 tremity, from above. Nat. size. 



The total length of the femur is 107 mm. ; the least width, in 

 the centre, is 10 mm. ; the greatest width, immediately below the 

 condyle, is 22 mm. Some idea of the relative length of the femur 

 in regard to that of existing marsupials may be gathered from the 

 following list, which represents the length of the femur in pro- 

 portion to that of the skull in the species named, calculating the 

 length of the skull in each case as 100, that is equal to that of the 

 f oss il : —l>richosurus fuliginosus 119-5 ; Dastfurus macvlatus 95-8 ; 

 Psendoehirus herbertemis 93-8 : P. archeri 100-8 ; Sarcoplnlvs 

 ursinm 107*6 ; BetUmgia perricMata 142-7; Phascolarctos 112-5; 

 D'ldelpliys marsupiaUs SO 9 ; Phalawjer sp. 895 ; Phascohmys 



1 This groove is too strongly marked in fig. 11, PI. L- ; and «** depth is 

 shown where it is seen in profile at the extremity of the bone. 



