Comparative Table of Dimensions of the Skeleton of the Mylodon robustus and 



other Megatherioids. 



From the fore-part of the skull to the end of the tail, foUow-T 



iiig the upper curves of the vertebral column . . J 



Circumference of the trunk, outside the tenth pair of ribs 



... ... pelvis ...... 



Length of the cervical region ..... 



dorsal region ...... 



lumbar region (anchylosed in the Mylodon) 

 sacrum (proper) ..... 



tail 



Cranium. 

 Length from the occipital condyles to the anterior border of 



the upper maxillary bones ...... 



Length from the occipital condyles to the anterior border of 



the base of the descending process of the malar bone 

 Length from the anterior border of same process to that of 



the upper maxillary bone ...... 



Breadth across the widest part of the zygomatic arches 

 Least breadth of cranium at the interspace of the arches . 

 Breadth of the nasal bones ....... 



} 



M. robustus. Megatherium* 



ft. in. lines, 

 11 





 

 

 6 



8 

 2 

 



1 6 6 



1 6 



ft. in. lines. 

 18 



14 4 

 2 1 



1 3 

 1 4 

 4 6 



Of 

 



5 10 







Of 







2 9 



1 10 6 



6 











!1 



6 



10 



9 



1 



G 







5 



4 



1 



G 







3 



3 







5 



7t 



Lower-jaw. 



Length. ...... 



Breadth between the posterior extremities . 

 condyles 



posterior sockets . 

 anterior sockets 



M. robustus. 



M. Darwinii. 



Megatherium. 



ft. in. lin. 



ft. in. lines. 



ft. in. lines. 



1 3 6 



1 6 



2 1 6 



G 3 



8 



1 1 6 



4 2 







2 10 



2 9 





4 



3 G 





* Calculated from the figure of the skeleton of the Megatherium by Drs. Pander and D' Alton, com- 

 pleted by Mr. Clift from the additional parts brought to England by Sir Woodbine Parish. See 

 Geological Transactions, Second Series, vol. iii. pi. xliv. 



t Taken from the actual specimen in the Museum of the Royal College of Surgeons. 



y2 



