yS SMITHSONIAN MISGELLANEUUS COLLECTIONS VOL. 8o 



Plate 15 



Hylopus hcntiitcnsis, new species. Type. No. 11,517. U. S. N. M. Track- 



wa}' showing variation in successive impressions. X ^ 46 



Plate 16 



Hyloidichnus bifurcatus, new genus and species. Type. No. 11.518, U. S. 



N. M. Trackway on the positive slab. X 2 S^ 



Plate 17 



Fig. I. ParnbaropHS coloradcnsis (Lull) No. 11,598, U. S. N. M. Left 

 side of trackway. Photographed from the cast of the original 

 specimciL X 3 54 



2. Cursipcs sp. Trackway from the Hermit shale. No. 11,521, 



U. S. N. M. X 1.9 ^3 



3. Unidentified track. No. 11,530, U. S. N. M. From the Hermit 



shale. About natural size ■ 65 



Plate 18 



Unidentified track. No. 11,528, U. S. N. M. The largest track yet found 



in the Hermit formation. X 1-85 64 



Plate 19 



Fig. I. Collcttflsannis pcntadactylus, new species. Type. No. 11,527, 

 II. S. N. M. Trackway showing how the mud flowed into the 



tracks as the foot was withdrawn. X 2 60 



2. Stenichnns yakiensis, new genus and species. Type. No. 11,533, 



U. S. N. M. Trackway. X 2 66 



Plate 20 



Anomalopus sturdcz'anti, new genus and species. Type. No. 11,517, 



U. S. N. M. Trackway on slab. X 2.5 68 



Plate 21 



Tridentii hints supaiciisls, new genus and species. Type. No. 11,534, 



U. S. N. M. Trackway on slab. X 2.2 70 



