62 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 80 



about 50 miiL The length of the digits may tentatively be recorded 

 as follows: digit I, 14 mm.; digit II, 24 mm.; digit III, 28 mm.; 

 digit IV, 28 mm. ; digit Y, 22 mm. These figures are subject to 

 revision since the impressions may have been lengthened by slipping 

 in the mud. Forefoot: Length about 54 mm. ; width measured from 

 tip of digit I to the tip of digit V, 41 mm. . Five digits, inner and 

 outer, shorter than median toes, both somewhat divergent, and both 

 originate well back on the opposite sides of the palm behind the bases 



Fig. ^t,. — Iguana sp. Tracks. Right figure, inamis : left figure, pes. 

 Both of the left side. Natural size. (After Hitchcock.) 



of the median digits. The first is weak, and, as in the hindfoot im- 

 pressions, about one-half as long as the middle toes. Sole long, narrow, 

 and obtusely ])ointed behind. Length of digit, I, 13 mm.; digit II. 

 26 muL ; digit III, 27 mm.; digit IV, 25 mm.; digit V, 20 mm. In 

 walking the forefoot is placed forward and directly in front of the 

 hindfoot. The weight of the animal, judging from the depth of the 

 impressions of the feet, was about equally distributed between the 

 fore and hind limbs. Forefoot but little smaller than hind. 



l^rom Collcftosannis magna (Butts) the present species may at 

 once be distinguished by the much shorter digit I in both manus and 

 pes and by the greater relative narrowness of the imi)rint as a whole. 



