I50 



PATAGONIAN EXPEDITIONS: PALEONTOLOGY. 



and material is wanting for a comparison of the different species in regard 

 to the variations in skeletal structure among them. It may, however, be 

 pointed out that in T. garrettorum the vertebrae, especially in the lumbar 

 region, have shorter, narrower and more slender spines than those of T. 

 lallenianti and that the third trochanter of the femur is less prominently 

 developed. 



Atlas length. 



" width over transv. proc. 

 " dorso-ventral height 

 3d cervical, length of centrum 

 " " width of anterior face, 



6th cervical, length of centrum 



" " width of anterior face. 

 7th cervical, length of centrum 

 " " width of anterior face, 

 1st thoracic, length of centrum 

 " " width of anterior face, 



2d thoracic, length of centrum 

 " " width of anterior face 

 loth thoracic, length of centrum 



" " width of anterior face 



Last thoracic, length of centrum 



" " width of anterior face 



2d lumbar, length of centrum 

 " " width of anterior face 

 4th lumbar, length of centrum. 

 " " width of anterior face 



Last lumbar, length of centrum 

 " " width of anterior face 



" " " " posterior face 



Sacrum, length 



" anterior width of centrum 

 " posterior " " " 

 Scapula, length . . . 



" width of neck . 

 Humerus, length from head . 

 " " " ext. tuber. 



" proximal thickness. 

 ' ' dist. width over trochlea 



" " " " epicondyles 



Radius, length 



" proximal width. 



" " thickness . 



Measurements. 



.067 Radius, distal width 



.101 " " thickness. 



.047 Ulna, length. 



.105 " prox. width at rad. facets 



.043 " distal width. 



.072 " " thickness . 



.041 Carpus, length in median line. 



.048 " width 



.045 Metacarpal II, length . 



.038 " " proximal width 



.037 " " " thickness 



.035 " " distal width . 



.034 " " " thickness 



.040 Metacarpal III, length . 



.036 " " proximal width 



.045 " " " thickness, 



.040 " " distal width . 



.048 " " " thickness 



.040 Metacarpal IV, length . 



.048 " " proximal width 



.0395 " " " thickness 



.037 " " distal width . 



.038 " " " thickness 



.027 Phalanx i, digit II, length . 



.171 ' " I, " " prox. width 



.030 " I, " " " thickness 



.012 " I, " " distal width 



.253 " I, " " " thickness 



.052 Phalanx 2, digit II, length . 



.234 " 2, " " proximal width 



.255 " 2, " " distal width 



.090 Ungual phalanx, digit II, length 



.050 " " " " width 



.070 Pelvis, length 



.311 Ilium, length 



.035 " greatest width 



.023 " width of peduncle 



.042 



.028 



•375 



•053 



.017 



.036 



.036 



.062 



.130 



.026 



.026 



.024 



.026 



.145 



.025 



.028 



.025 



.0245 



.122 



.024 



.025 



.0245 



.0245 



.058 



.0245 



.022 



.020 



.016 



.028 



.0245 



.020 



.0225 



.025 



■305 

 .192 



•237 

 .058 



