EDENTATA OF THE SANTA CRUZ BEDS. 



247 



Last thoracic, width of neural spine at 



tip 019 



First lumbar, length of centrum 023 



" " width of anterior face 024 



" " " " posterior face . . . .026 

 " " " over transverse 



processes 049 



Second lumbar, length of centrum 025 



" width of anterior face .025 

 " " " " posterior face .026 

 " " " over trans- 

 verse proc- 

 esses 046 



Third lumbar, length of centrum 026 



width of anterior face . . . .026 

 width over transverse pro- 

 cesses 048 



" height ot neural spine . . .039 



Fourth lumbar, length of centrum 026 



" " width of anterior face . . .027 



" " " over transverse 



processes 054 



" " height of neural spine . . .040 



Sacrum , length 119 



First sacral, width of anterior face 030 



Fourth sacral, width of posterior face . . .027 

 First caudal, length 022 



MEASUREMENTS. 



First caudal, width of anterior face 030 



" " " over transverse pro- 

 cesses 085 



Second caudal, length of centrum 022 



" " width of anterior face . . .026 



" " " over transverse 



processes 08 1 



Third caudal, length of centrum 022 



" " width of anterior face . . . .026 

 " ' " over transverse pro- 

 cesses 076 



Fourth caudal, length of centrum 022 



" " width of anterior face ... .022 

 " " " over transverse pro- 

 cesses 068 



Fifth caudal, length 022 



" " width of anterior face 021 



" " over transverse pro- 

 cesses 068 



Sixth caudal, length 023 



" " width of anterior face 020 



" " " over transverse pro- 

 cesses 063 



Seventh caudal, length 022 



" " width of anterior face . . .018 



" " " over transverse 



processes 059 



In the humerus (Plate XLII, fig. 4), the differences from H. elongatus 

 are but trifling; although this bone is actually shorter than in the latter 

 species, its relative length, as compared with that of the skull, is nearly 

 the same, and the proximal portion is somewhat heavier; the bicipital 

 groove is rather more distinctly marked and the inner border of the 

 deltoid area is extended proximally almost to the head, not dying away 

 so gradually as in the other species. The supinator ridge is hardly so 

 broad as in H. elongatus, but has a thicker free border and the trochlear 

 facet for the radius is somewhat less convex ; the supratrochlear fossa is 

 decidedly smaller and shallower and the anconeal fossa very much more so. 



The fore-arm bones (Plate XLII, figs. 5, 6) also differ very little save 

 in size from those of H. elongatus; the ulna is somewhat more curved in 

 both directions, especially laterally, while the radius has a somewhat 



