[STERNBERG] PANOPLOSAURUS MIRUS 101 



The unguals of digits II and III differ from that of digit I only in 

 being broader, especially at the distal extremity. 



Above digit III on the sand rock is what seems to be the impres- 

 sion of a thick skin without scales. This is segmented to conform to 

 the number of phalanges and seems to indicate that the toes, though 

 separate from one another, were encased in a thick padding. 



Length of metacarpal II through its middle 105 mm. 



Proximal breadth of metacarpal II 50 " 



Distal breadth of metacarpal II 52 " 



Length of digit II 110 " 



The only parts of the hind foot preserved are one metatarsal, 

 probably the second of the right foot, one proximal phalanx, and two 

 unguals. The metatarsal is almost identical in shape, with meta- 

 carpal II described above, but is considerably larger, measuring 

 130 mm. in length. The phalanges resemble those of the front foot 

 but are larger. 



Tibia and Fibula. — The right tibia and fibula were found together 

 and are complete except for part of the distal end of the tibia (Plate II, 

 Figure 3). The information lost with the missing portion is partly 

 supplied by the left tibia. The tibia is short and stout, constricted 

 medially, and greatly expanded at the extremities. The proximal 

 end shows that there were two condyles for articulation with the 

 femur, though no detailed description can be given because of their 

 crushed condition. There is no cnemial crest discernible. The least 

 diameter of the shaft is just below the midlength. 



Only the external one-third of the distal end is present. This 

 portion is quite thin antero-posteriorly. The inner portion, as shown 

 by the fragmentary left tibia, is broader and cupped for the articula- 

 tion of the astragalus. 



The tibia is shorter than the humerus. It is evident that the 

 hind limb of Panoplosaurus was relatively much shorter than that of 

 Stegosauriis or Scelidosaurus in which genera the tibia is longer than 

 the humerus. Judging from this and Ankylosatirid remains seen in 

 the field it appears probable that the hind limbs of the Ankylosauridae 

 were little longer than the fore limbs. 



The fibula is a long straight bone with slender shaft and expanded 

 extremities. The expanded ends are so rotated relatively to one 

 another that their longest diameters are nearly at right angles to 

 each other. The fibula articulates with the tibia much as in 

 Stegosaurus but is relatively shorter. On the posterior face of the 



