PKTF.kSON : OsTKOI.OtJV OI' OxVDACTYLUS. 



453 



COMrAKATIVK MlASIkFMl \ rs OK THK A^ERTKliRAL CoLUiMN. 



O. /ong-i/>fs C. hactriatius. L. huanaco. 



Greatest length of atlas 80 mm. 105 mm. 58 mm. 



Greatest breadth of atlas 75 mm. 122 mm. 76 mm. 



Leni^th of atlas median line inferiorly 43 mm. 61 mm. 34 mm. 



Greatest breadth of cotyle 55 mm. 105 mm. 52 mm. 



Height of atlas posteriorly, includ'ng the inferior 



tubercle 42 mm. 75 mm. 44 mm. 



Greatest length of axis 15S mm. 22010111. 121mm. 



Length of centrum 138 mm. 180 mm. 102 mm. 



Length of odontoid process 20 mm. 24111111. 16 mm. 



Greatest height of axis 65 mm. 104 mm. 60 mm. 



Greatest width of centrum anteriorly 5' nim. 85 mm. 49 mm. 



Greatest length of third cervical 19501111. 190 mm. 124 mm. 



Length of centrum of third cervical anteriorly... 174 mm. 165 mm. no mm. 



Width of centrum of third cervical 26 mm. 4411101. 26 mm. 



Greatest length of fourth cervical 191mm. 1851001. 124 mm. 



Length of centrum of fourth cervical 176 mm. 162 mm. 108 mm. 



Width of centrum of fourth cervical anteriorly.. 34 mm. 5° mm. 29 mm. 



Greatest length of fifth cervical , 1690101. 183 mm. 119 mm. 



Length of centrum of fifth cervical 150 mm. 1580101. 100 mm. 



Width of centrum of fifth cervical anteriorly 34 mm. 55 oini. 31 mm. 



Greatest length of the sixth cervical 135 mm. 1750101. )02 mm. 



Length of centrum of the sixth cervical no mm. 140 mm. 83 mm. 



Width of centrum of the sixth cervical anteriorly 37 mm. 610101. 330101. 



Greatest length of seventh cervical *loo mm. 138 mm. 78 01m. 



Length of centrum of seventh cervical *77 mm. 1 15 mm. 59 "m"- 



Width of centrum of seventh cervical anteriorly 37 mm. 64 mm. 35 mm. 



Greatest length of first dorsal 78 mm. 115 mm. 55 "^'^i- 



Length of centrum of first dorsal 55 mm. 79 mm. 39 mm. 



Height including spine of first dorsal 125 mm. 215 mm. 105 mm. 



Width across transverse processes of first dorsal.. 87 mm. 125 mm. 73 mm. 



Length of centrum of fourth lumbar 53 mm. 710101. 450101. 



Length of centrum of fifth lumbar 50111111. 7111101. 4401111. 



Total length of centra of fourth, fifth, sixth and 



seventh lumbars 205 mm. 2650101. 165 mm. 



Greatest length of sacrum ^142 mm. 211 mm. 13001111. 



Greatest width of sacrum no mm. 195 mm. 120 mm. 



Greatest width at posterior end of sacrum 41 mm. 75 mm. 43 mm. 



The Scapula and Fore I.imb. (PL VII, Fig. i.) 



The scapula is longer than in the llama. The neck is longer and 



more constricted. The coracoid is proportionally less prominent, and 



the spine overhangs the postscapular fossa more than it does in the 



llama. In the type the spine begins 35 mm. above the glenoid cavity 



