COMPARATIVE MEASUREMENTS. 



103 



the height. In our Elephant the ribs* are nineteen ; in another specimen, 



twenty. 



MASTODON. ELEPHANT. 

 Inches. Inches. 



Length of the first rib 

 Width of the first rib ... 

 Length of the tubercles of the first rib 

 Length of the twentieth rib 

 "Width of the twentieth rib 

 Length of the nineteenth rib 

 Width of the nineteenth rib 











18 



4 



4 

 10 



11 





20 



4| 



17 

 1 



PELVIS. 



The ossa innominata are not co-ossified with the sacrum. 



The ossa pubis are co-ossified from the symphysis to the termination 

 of the upper third ; then occurs a slit between the rami, or branches, six 

 inches in length. From the inferior termination of this slit to the inferior 

 edge of the pelvis, they are consolidated. Nearly the same arrangement 

 is seen in the large skeleton ; but in the Elephant, there is no union, 

 by bony matter, of the symphysis of the pubis. 



The sacrum measures 



From the top of the os sacrum to the inferior extremity of the ossa ischii 



From the crest of the pubis to the inferior extremity of the ischium 



Transverse width between the two anterior superior spinous processes 



Transverse diameter of the aperture 



Vertical diameter of the aperture 



Long diameter of the thyroid foramen 



Short diameter of the thyroid foramen 



Long diameter of the acetabulum . 



Short diameter of the acetabulum 



Width between the tuberosities of the ischia 



9 



36 

 16| 

 58 

 19 

 19J 

 7 



4i 

 6 



5| 

 15J 



14i 



30i 



13| 



43 



16 



15 



3 , 



7 



7 



11 



The direction of the ossa innominata is nearly vertical. The brim of 



