NO. 3 GRAND CANYON FOSSIL FOOTPRINTS GILMORE "JJ 



Plate 5 



Figs, i and 2. Barypodus tridactylus, new species Type. No. 11,502, 

 U. S. N. M. Showing trackway. Fig. i, upper or positive slab; 

 fig. 2, lower or negative slab. X 2.64 20 



Plate 6 



Barypodus mctsacri, new species. Type. No. 11,505, U. S. N. M. Irregu- 

 lar trackway. X 3 21 



Plate 7 



Baropus coconinoensis, new species. Type. No. 11,514, U. S. N. M. Left 



side of trackway. X, 3.2 24 



Plate 8 



Agostopiis mcdius, new species. Type. No. 11.509, U. S. N. M. Track- 



v^'ay. X 346 •, 27 



Plate 9 



Amblyopus pachypodus, new genus and species. Type. No. 11,511, 

 U. S. N. M. Trackway ; outer rows of impressions made by 

 forefeet, inner, those of the hindfeet. X 4-57 29 



Plate 10 



Fig. I. Triavcstigia niningcri, new genus and species. Type. No. 11,510, 

 U. S. N. M. Tail drag clearly shown between the parallel rows 



of tracks on the left side. X 1.3 33 



2. Octopodichnus didactylus, new genus -dud species. Type. No. 11,501, 



U. S. N. M. X17 31 



Plate ii 



Unisulcus siniiostis, new species. Type. No. 11,497, U. S. N. M. Three 



trails crossing slab. X 2 35 



Plate 12 



Batrachichnus delicatula (Lull) No. 11,519, U. S. N. M. Large slab whose 



surface is thickly covered with minute tracks. X 4-5 36 



Plate 13 



Batrachichnus obscurus, new species. Type. No. 11,529, U. S. N. M. 

 Trail showing where belly dragged in the mud. Plant impres- 

 sions. Large tracks those of Hylopus hcniiitcnsis. X -2.7 40 



Plate 14 



Dromillopus parvus, new species. Type. No. 11,537, U. S. N. M. Track- 

 way with tail drag between. Tracks on left side belong to some 

 five-toed creature. .71 over natural size 42 



