I\0. 9 GRAND CANYON FOSSIL FOOTPRINTS GILMORE 4I 



Plate 6. 



Laoporus nobcli Lull. No. 11,122, U. S. N. M. Tracks of the smaller 

 species L. sclnicherti may be represented on this slab by some 

 sm.all imprints at the bottom. About 5 natural size 14 



Plate 7. 



Fig. I. Laoporus coloradoensis (Henderson). No. 11,176, U. S. N. M. 

 From the Coconino sandstone, Grand Canj'on, Arizona. Tracks 

 slightly larger than the type but very similar in all other re- 

 spects. Slightly less than ^ natural size 16 



2. The same. Type, No. 13,238, Colorado University. From the 



Lyons sandstone, Colorado. Slightly more than \ natural size. . . 17 



Plate 8. 



Baropczia cakini, new species. Type, No. 11,137, U. S. N. M. The lower 

 portion cast from the obverse slab. The deformed digits of the 

 right pes are clearly shown. About 2 natural size iS 



Plate 9. 



Baropczia cakini. new species. No. 11,138, U. S. N. M. Crossed diago- 

 nally by a trackway of Laoporus nobeli Lull. Trackway of 

 former made by same individual that made the type as shown by 

 the deformed digits of the right hindfoot. About j natural size. . 19 



Plate 10. 



Agostopus viathcri, new genus and species. Type, No. 11,135, U. S. N. M. 

 A large footprint of some unidentified animal has blotted out 

 part of the tracks of the right side. About \ natural size 23 



Plate ii. 



Fig. I. Barypodus palmatus, new genus and species. Type, No. 11, 134, 



U. S. N. M. Fore-and hindfeet. Less than i natural size 27 



2. Allopus? arizonae, new species. Type, No. 11,123, U. S. N. M. 

 Oblique view of the large slab. Crossed diagonally by a trail 

 of Laoporus and also by a second trackway of Allopus. About 

 y'y natural size 29 



Plate 12. 



Fig. I. Palcohclcura tridactyla, new genus and species. Type, No. 11,145, 

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



of tracks. More than ^ natural size 31 



2. Mesichnium benjamini, new genus and species. Type, No. 11,155, 

 U. S. N. M. The direction of movement was toward the top. 

 More than ^ natural size 34 



