THE FOSSIL FOOTMARKS OF THE UNITED STATES. 253 



Plate IX. Fig. 1. Polemarclius gigas. 



" 2, 3. Plectropus ininitans. 

 X. " 1 -3. P, longipes, on different layers. 



" 4. Triaenopus Baileyanus. 



" 6. T. Emmonsianus. 



" 6. Typopus abnormis. 



XI. " 1. Palamopus Dananus ; left foot. 



" 2. P. Dananus ; right foot. 



XII. " 1. Otozoum Moodii. 



" 2. Slab, with four tracks of O. Moodii, several 

 of Brontozoum, and rain-drops. 



XIII. " 1. Anomoepus scambus ; hind foot. 

 " 2. A. scambus; fore foot. 



" 3. A. scambus; hind foot, with perhaps four toes. 



" 4. A. scambus ? hind foot. 



" 6, 6. A. scambus ? fore feet. 



XIV. " 1. A. Barrattii; left hind-foot. 

 " 2. Harpedactylus gracilis. 



" 3. H. concameratus. 



" 4. H. concameratus ? hind foot ? 



" 5. H. concameratus ? fore foot .'' 



XV. " 1. Helcura littoralis. 



" 2. Typopus ? 



" 3. Ancyropus heteroclitus ; fore foot. 



" 4, 5. A. heteroclitus ; hind foot. 



" 6. Macropterna recta ; hind and fore foot. 



" 7. M. divaricans ; hind and fore foot. 



" 8. Xiphopeza triplex ; hind and fore foot. 



" 9. Macropterna rhynchosauroidea; hind and fore 

 foot. 



