3« 



KANSAS UNIVERSrrV QUARTERLY. 



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this upper facet, and covering the one with which it articulates in 

 reality. The third and fourth are not very strongly coossified on 

 the upper part. Their longitudinal axis is 

 more nearly in the same line as that of the 

 fore arm, and the third is as long as the 

 fourth, while in Dicotyles it is noticeably 

 shorter. The conjoined bones are more 

 expanded proximally. 



Length of third metacarpal • ■ -^5 



Length of fourth metacarpal 86 



Width of conjoined bones proximally 45 



The relative proportions of the different 

 elements in this skeleton and in that of the 

 adult Z>. tori]iiatiis\\%^i\ for comparison, are as 

 follows, the humerus in each case being 100. 



Plalyijoii IIS. Dicotijles. 



Humerus 100 100 



Scapula 106 89 



Ulna 106 96 



Carpus 13 13 



Middle metacarpals 42 30 



TT 12/^ W It is seen that the humerus is a relatively 



short bone in Platygomis. 



Tibia. 



The tibia, except that it is a little less 

 curved outwardly on the distal part, and has 

 a stouter cnemial crest, a more rounded 

 external border above, and less projecting 

 mallolus, scarcely differs in form from that 

 of Dicotyles. Its measurements are as fol- 

 lows. 



Length 195 mm. 



Diameter through condyles 46 



Least diameter of shaft 20 



Antero-posterior diameter i^listally. - 29 



F. leptorhinus, palmar Tarsus. 



radius® ""^"umaVTi^f- The calcaneum is stouter, and not as 



mrnrypisUOTm%Ttr^^^ ™"^'^ comprcsscd, the sustentaculum and 

 unicitorm- Yi-T^eionH- the process for articulation with the fibula 

 liifth digits. g^j.g xixoxe prominent. 



The scaphoid is a flatter bone, its under surface has a more 

 prominent roughening, and its proximal inferior angle is separated 

 by a much larger interval from the calcaneum. On the cuboid, the 



