SCOTT : LITOPTERNA OF THE SANTA CRUZ BEDS. 



lOI 



of the type of T. crepidatum, and No. 69, a cast of a second individual 

 with similar reference, while No. 75 is from the type of T. rhabdodon. 

 All these casts are from originals in the Ameghino collection. No. 15,721 

 is the skull of a very old animal. No. 15,714 is the mandible of an old 

 animal and No. 15,719 an animal at maturity. 









Measurements. 















No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 





62. 



60. 



66. 



69. 



75- 



15,240. 



15,721- 



15,714- 



15,719 



Upper dentition, 





















length i^-m-3- 









.100 





.100 



.094 







Upper cheek-teeth 





















series, length 







.070 



•073 





.072 









Upper premolar 





















series, length 







.036 



.038 





•037 









pi, length 







.007 



.0085 



.008 



.008 









" width 







.007 



.007 



.007 



.007 









P^, length 





.008 



.009 



.009 



.009 



.G085 









" width 





.009 



.010 



.010 



.0095 



.010 









Pl, length 





.010 



.010 



.010 





.0095 









" width 





.OI2 



.012 



.013 





.012 









pi-, length 





.Oil 



.011 



.011 



.0115 



.010 



.010 







" width 







.014 



.014 



•0135 



.013 



.0125 







Upper molar series, 





















length . 





.035 



•03 s 



.036 





•034 



.031 







Ml, length 





.012 



.012 



.0115 



.0115 



.010 



.0095 







" width 





.014 



.014 



.015 



.014 



.015 



.014 







M^, length . 





.013 



.014 



•013 





.OI2 



.011 







" width 





.016 



.017 



.016 





.016 



.015 







M^, length 





.013 



.0125 



.0125 





.012 



.0105 







" width 





.016 



.015 



.015 





.CIS 



.CIS 







Lower dentition, 





















length, ig— mj 



.090 







.092 









.091 



.091 



Lower cheek-teeth 





















series, length 



.070 







•073 









•073 



.076 



Lower premolar 





















series, length 



■034 







.036 









.036 



•037 



Py, length 



.007 







.006 









.006 



.0065 



" width 



.004 







.004 









.004 



.004 



P^, length 



.009 







.009 









.010 



.0105 



" width 



.0055 







.006 









.005 



.006 



Pg, length . 



.0095 







.0105 









.0105 



• Oil 



" width 



.008 







.0075 









.008 



.008 



P^, length . 



.0115 







.012 









.011 



.0115 



