I02 



PATAGONIAN EXPEDITIONS: PALEONTOLOGY. 





No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 





62. 



60. 



66. 



69. 



75- 



15,240- 



15,721. 



i5,7H- 



15,719 



P^ width 



.008 







.009 









.008 



.009 



Lower molar series, 





















length 



.036 







■037 









■037 



■039 



My, length 



.010 







.0105 









.0105 



.0115 



" width 



.008 







.0085 









.008 



.009 



Mj, length . 



.012 



.013 





.0125 









.013 



•013s 



" width 



.009 



.009s 





.0085 









.009 



.0095 



M^, length 



.014 



.014 





.014 









.013 



.014 



" width 



.009 



.008 





.008 









.008 



.008 



The dimensions of the skull in the following table are taken from No. 

 15,721, a rather small and very old individual, which had lost the anterior 

 premolars (pi-p.^) during life, and those of the mandible from No. 15,719, 

 a much younger animal, in which ms had just come into use. 



Skull, median basal length 



" length condyles to premax. . 

 " extreme length 

 Cranium, length condyles to anterior 

 rim of orbit .... 



Cranium, width at postorbital con- 

 striction ..... 

 Cranium, greatest width . 

 Occiput, height .... 

 " width at base . 

 " " over condyles . 



" at top . 

 Face, length orbit to premaxilla 



Measurements. 







.150 



Forehead, width over middle of orbits 



.057 



.162 



Face, 



width over lachrymals . 



.051 



.181 



Rostrum, width 



.023 





Palate 



length in median line . 



.085 



•093 



n 



width at m^ 



.023 





Mandible, length . 



•139 



•035 



(( 



" angle to m^ 



.048 



.041 



ii 



height of coronoid . 



.079 



•053 



It 



" condyle . 



.063 



•047 



It 



length of symphysis 



.028 



.031 



tt 



depth below p^ 



.019 



.015 



tt 



" mj . 



.024 



.078 



A comparison of these dimensions with the corresponding ones of Pro- 

 tevotherium cavum (p. 76) will show how different are the proportions of 

 the two skulls. 



The measurements of the vertebrae given below are derived from three 

 individuals, Nos. 15,719, 15,721, and 15,722, all of which agree closely 

 in size. 



Measurements. 



Atlas, length .... 



.0295 



Atlas, dorso-ventral height . 



.029 



" width over ant. cotyles 



•034 



Axis, length excl. odontoid . 



.027 



" post. " . 



•034 



" incl. 



.038 



" " " trans, processes 



.047 



" width of anterior face . 



.030 



