SCOTT : LITOPTERNA OF THE SANTA CRUZ BEDS. 



147 



Ameghino gives the following measurements of his specimen : Length 

 of skull from condyles to premaxillaries, 32 cm.; length of lower dentition 

 from iy to m^, 19 cm.; depth of mandible below p-2, 31 mm. ('91^, 294). 



A considerable number of skeletal parts are associated with the jaw, No. 

 15,216, and from this individual the following dimensions have been taken. 

 These bones show that T. lallemanti is a stoutly built animal, and that the 

 trunk-vertebrae have heavy spines. Especially in the lumbar region are 

 the neural spines high and very broad antero-posteriorly. The third « 

 trochanter of the femur is large and prominent. 



Atlas, length 



" dorso-ventral height 

 Axis, length incl. odontoid 

 excl. " 

 " width of anterior face 

 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 

 13th thoracic, length of centrum 



" " width of anterior face. 



14th thoracic, length of centrum 



" " width of anterior face, 



1st lumbar, length of centrum 

 " " width of anterior face 

 " " dorso-ventral heigh 



incl. neural spine 

 2d lumbar, length of centrum 

 " " width of anterior face 

 3d lumbar, length of centrum 

 " " width of anterior face 

 4th lumbar, length of centrum 



" " width of anterior face 

 5th lumbar, length of centrum 



Measurements, 



.065 

 .047 



5th lumbar, width of anterior face 

 " " " " posterior face, 



.117 " " dorso-ventral heigh 1 



.096 incl. neural spine 



.043 Sacrum, length 



.104 " anterior width of centrum 



.040 " " " overpleurap 



.076 " posterior width of centrum 



.042 Scapula, length in median line 



.048 " width of neck . 



.0415 Pelvis, length ... 



.044 " width over iliac plates . 



.034 " " " ischial tuber. 



.045 Acetabulum, ant.-post. diameter 



.038 " transverse " 



.049 Pubic symphysis, length 



.038 Humerus, length from head . 



" " " ext. tuber. 



.125 " width of trochlea . 



.047 " " over epicondyles 



.036 Femur, distal width 



.049 " " thickness 



.036 Tibia, length including spine . 



.052 " proximal thickness 



.038 " distal width 



.048 " " thickness . 



035 

 030 



119 



162 

 033 

 154 

 018 

 24 s 

 052 



377 

 390 

 172 

 051 

 042 

 098 



239 

 251 

 047 

 066 

 074 

 092 

 260 

 081 

 046 

 041 



Localities. — Neither Ameghino nor Mercerat give localities for their 

 specimens. No. 15,359 was found by Mr. Hatcher at Killik Aike, and 

 No. 15,216 was collected by Mr. Peterson 5 miles south of Coy Inlet. 



