MY H. II. SCOTT AND CLIVE K. I.OKD. 



81 



It is an interesting fact that the horns of existing 

 Rhinoceroses are strengthened and repaired along the 

 front and fronto-lateral surfaces, to compensate for wear 

 and tear, just as in the Nototheria, but apparently to a 

 Lees degree, centrally, than obtained in the horned mar- 

 supials. If all the known Rhinoceros horns are passed 

 view, upon the question of size, ratio of base to 

 height, as well as outline in girth, the card from the 

 nasal platform of Nototherium mitchelli would nearest lit. 

 the baso of an Indian Rhinoceros's horn; and if selec- 

 tion among such horns, upon a ratio of height to base- 

 girth, were made, tin- height of the Nototherian horn 

 would 1> nine t<» ten inches. A- note — computed girth; 

 deduced from available platform \ en inches. 



average height of a horn of such girth, nine to ten inches. 

 As some Rhinoci ros horns have a distinct cingulum near 

 the base, above which they contract in girth rapidly, this 

 circumstance Bhould b note of, also the fact that 



although practically adult, our Nototherium was still a 

 _ animal, and the nasal weapon would certainly be 

 shorter than in an old male, who had many times shed 

 and renev ed it. 



It will be convenient to give here the comparative 

 thickri the nasal bones of the two b st-known 



Nototherian skulls, namely. Nototherium mitchelli and 

 Nototherium tasmanicum, since nothing else short of a 

 arative examination of the actual skulls themselves 

 will convey to the mind the extra massiveness of Noto- 

 I'ni i in in mitchelli. 



TABLE OF CALIPERED THICKNESSES OF 

 NOTOTHERIAN NASAL PLATFORMS. 

 N. tasmanicum. A. mitchelli. 



}- 



Thickness of right nasal) _ 



bOBS .. ... . I 



Thickness i E left nasal I 



1 088 ... ... ... / 



Central thick nes 

 general nasal pi itform 



Thickness, at baf>e, of) 

 nasal cartilage stud* l~ 



Thickness of platform") 

 midway between the I _ .. 

 Btud and the I i 

 nasal boss ... ... J 



Width of nasals in toto =138 



42 mm. 



11 



I h ckness oi i ight nasal ) 



V = bO Mini. 

 boss ... ... ...) 



Thickness of left nasal | _„ 

 boss ... ... ... j ~ 



Central thickness of I 

 general nasal platfoi m I 



Thickness, at base, of\_~ 9 

 nasal cartilage stud / 



Thickness of platform i 



midway between the ( . - 



si lid and t he lateral j 



nasal b08S ... ... J 



Width of nasals in tatn — 175 



= 21 



In i hi.s skid I the right Btud has fused to the nasal, and is drawn out 

 bo a 1 hinness of 17 mm. at the tip. 



