75 



Sacral irj^^ion. 



M. 



Length of sacral series • 264 



Transverse extent of sacral series • 298 



Diameter of first vertebra at free end (transverse) • 109 



Diameter of first vertebra at free end (vertical) 072 



Diameter of first vertebra at free end (tore and aft) -070 



Diameter of last vertebra at free end (transverse) -053 



Diameter of last vertebra at free end (vertical) -031 



Diameter of neural canal at first vertebra (transverse) • 100 



Diameter of neural canal at last vertebra (vertical) -oiS 



Long diameter of first transverse foramen (internal side) -076 



Caudal region (Fig. 6, Plate VL). 



M. 



Length of first four • 252 



Diameter of centrum, first (fore and aft) -061 



Diameter of neural canal of first (transverse) -035 



Extent of transverse process in first -085 



Extent of transverse process in fourth -046 



Fore-and-aft width of transverse process of first in the middle -048 



Ribs. — Description based upon two ])erfect ones, and parts 

 of four more. 



The ribs, as in Diiioceras, " resemble very mucii those of 

 the Mastodon!' The capitulum has two convex facets, sepa- 

 rated by a narrow groove. The sternal end in rme is very 

 much expanded, but less so in the other. The tubercle is 

 small, and is situated upon the prolongation of the lamelli- 

 form process for the intercostal muscles. The angle is much 

 sharper than in the corresponding ribs of Mastodon. 



Mcasitretnents of Ribs. 



M. 



Length of rib without curvature -571 



Length of rib with curvature • 739 



Width of rib just below head -049 



Width at muscular attachment -063 



Vertical diameter of larger facet of capitulum -039 



^^-^//^/la (Plate VIII., Fig. i). — The scapula is sub-triangular, 

 with the pre-scapular border as base, and the apex half way 

 up the post-scapular. 



On the external side the pre-scapular fossa is concave an- 

 tero-posteriorly, and plane in the direction of its length ; it is 

 ver}^ thin in the middle, but becomes heavier at the lateral 



