48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 80 



bluntly rounded end and was apparently without claw. If a claw- 

 was present on the first digit it must have been obtusely pointed. In 

 all of the tracks, the sole is rather faintly impressed in so far as its 

 exact posterior outline is concerned. As determined it is relatively 

 short, but broad, and apparently without prominent palmar pads. 

 Forefoot: Smaller than hindfoot. Length 32 mm. ; width from tip to 

 tip of first and fifth toes is 36 mm. Five toes, arranged much as in 

 the hindfoot. Fourth is longest, progressively shortening inward. 



Fig. 22. — HylopHs hardingi Dawson. Trackway. (After Matthew.) 





Fifth more widely divergent from fourth than in the pes, with an 

 inclination to turn backward, and apparently without claw. The palm 

 is short, and rounded behind. 



A second series of tracks (No. 11.524, U. S. N. M.) from this 

 same locality, occurring on the weathered surface of a small slab of 

 shale found on the hillside below the ledge where the type was found 

 in place, is identified as belonging to this same genus and species. 

 It is smaller than the type (see table of measurements) but otherwise 

 is in close agreement as to the proportions and arrangement of the 

 digits. Other scattering imprints of Hylopus are present on several 

 slabs of shale from this same locality. 



