Mylodon harlani, from Bock CreeJc, Texas. 



365 



Ian in 1843* refers to it as 0. missouriense. The cast also 

 bears the words Mylodon harlani, the name under which 

 the specimen was recorded in the catalogue of the old 

 Yale Cabinet, which was the repository of such things before 

 the establishment of the Peabody Museum. The second cast 

 is again a right humerus slightly larger than the first and bear- 

 ing the same old catalogue number (700). It comes from the 

 same locality and was also presented by Doctor Perkins. Its 

 further history is unrecorded. 



A comparison of the three humeri, the two casts and the 

 larger Texan form, fails to disclose any marked differences 

 either in form or proportions between them, although the last 

 is materially smaller than either of the others. What distinc- 

 tions they 6how are of very minor importance — only the extent 

 and degree of rugosity of the muscle areas and the fact that 

 the olecranon depression is a little more marked in the casts. 

 There is certainly nothing which would justify a specific 

 separation of the three animals. 



Dimensions. 





Texan Mylo- 



Orycterotke- 







don 



rium 







•Cat. No. 



Oregon ensis 



Ratios 





10265 



Cast of type 







mm 



mm 





Length over all 



442 



509 



115 



Girth, proximal end 



452 



530 



117 



" over deltoid ridge. 



296 



328f 



in- 



" below deltoid ridge 









(least) 



246 



278 



ns 



" at distal end 



560}: 



640 



114 + 



Diameter (greatest) at 









proximal end . .. 



166 



188 



113 + 



" (least) at proximal 









end (articular) 



122 



148 



121 + 



(least) of shaft.. 



60 



70 



116 + 



" (greatest) at dis- 









tal end 



260J 



290 



112 — 



" (least) at distal 









end _ 



67 



92 



136 



Width of trochlear (artic- 









ular) 



120 



156 



130 





Av. 118 



* Harlan, op. cit., p. 80. f Slightly broken. % Estimated. 



