PLATE II. 



Typical vertebrae in the Megatherium. One-fourth natural size. 



Fig. 1. Fifth dorsal vertebra, or natural segment of the skeleton, c. Centrum, d. arti- 

 cular tubercle for head rib ; n, neurapophysis, n', neurapophysial surface 

 for neck of rib ; d, diapophysis, d', diapophysial surface for tubercle of rib ; 

 *, anterior zygapophysis ; m, metapophysis ; ns, neural spine ; pi, pleurapo- 

 physis or 'vertebral rib'; c", head; n", articular surface on upper part of 

 the neck ; d", articular surface on tubercle ; h, haemapophysis or ' sternal 

 rib,' s 1 , V, its condyles ; hs, haemal spine, or ' sternal bone;' /, *", articular 

 surfaces for haemapophysial condyles. 



Fig. 2. First caudal vertebra, n. Neural arch ; p, parapophysial part, d, diapophysial 

 part, pi, pleurapophysial part, of compound transverse process ; hy, hyp- 

 apophyses; h, haemapophysis, hy 1 , articular surface for its own vertebra, 

 which is in advance; hy", articular surface for succeeding vertebra. 



