82 



BULLETIN 171, UNITED STATES NATIONAL MUSEUM 



Table 23. — Measurements {in millimeters) of skeleton of Platygonus cumber- 



landensis — Continued 



Measurement 



U.S.N.M. 



no. 8290 



(paratype) 



Anterior limb — Continued 



Width of proximal articular face of humerus 



Width of distal articular face of humerus.. 



Anteroposterior diameter of shaft just below deltoid tubercle. 



Greatest length of ulna... ».-.- 



Greatest length of radius 



Transverse diameter of sigmoid fossa 



Transverse diameter of d istal face of radius 



Least vcidth of conjoined bones 



Transverse diameter of carpus 



Length of carpus, inside... 



Length of carpus, outside 



Width of proximal end of metacarpals III and IV 



Length of metacarpal III, inner side 



Least transverse width of metacarpals III and IV. ._ 



Length of the three phalanges of digit III 



Posterior limb 



Greatest length of innominate bone 



Center of acetabulum to anterior border of ilium 



Center of acetabulum to posterior border of ischium... 



Diameter of acetabulum 



Length of pubic symphysis 



Longest diameter of obturator foramen 



Greatest length of femur 



Anteroposterior diameter of head of femur 



Transverse diameter of head of femur 



Transverse diameter of condyles of femur 



Transverse diameter of trochlea of femur 



Length of tibia, inner side 



Width of proximal end of tibia 



Width of distal end of tibia 



Width of proximal end of astragalus 



Greatest length of astragalus 



Greatest length of calcaneum 



Total length of tarsus... 



Width of proximal end of metatarsals 



Width of distal end of metatarsals 



Length of metatarsals, inner side 



Least width of fused metatarsals -.. 



Total length of three phalanges of digit III 



40 

 34 

 39 

 240 

 170 

 35 

 41 

 33 

 37 

 28 

 36 

 37 

 91 

 37 

 06 



270 

 140 

 135 

 35 

 90 

 52 

 226 

 34 

 30 

 53 

 25 

 205 

 64 

 36 

 26 

 42 

 75 

 62 

 30 

 34 

 97 

 23 

 86 



PLATYGONUS VETUS(7) Leidy 



A single palate and maxillary portion, U.S.N.M. no, 8917, with the 

 permanent and two deciduous premolars and the first two molars, 

 was believed by Gidley (1920b, p. 658) to represent Platygonus vetus. 

 The molars in this specimen are somewhat larger than the average in 

 P. cumherlandensis and unusually wide, approaching the relative 

 proportions seen in P. vetus. Although this specimen may represent 

 an individual of P. cwnberlandensis showing a variation of characters 

 in the direction of P. vetus, its reference to </he latter species is tenta- 

 tively retained. It is possible that were Platygonus vetus better known 

 the variation of characters within that species would be sufficiently 

 great to include those outlined for P. cumherlandensis. However, in 



