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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 80 



in plate 9, the outer right-hand row being those made by the forefoot, 

 the second inner row being those of the hindfeet of that side. 



The depth of the tracks, wide trackway, short stride, and large 

 size of the imprints indicates they were made by a heavy, squat 

 animal, with a relatively short body, for otherwise it would be quite 

 impossible for the hindfoot to have been set upon the imprints of 



Fig. 12. — Amblyopus pachypodiis. Type. No. 11,511, U. S. N. M. 

 Diagram of part of the trackway. Outer row of tracks made by the 

 forefoot; inner row, made by the hindfoot, and placed partly upon 

 the tracks of manus. About g natural size. 



the forefeet. No evidence of a tail drag was found. This specimen 

 occurred at a slightly lower level in the horizon than the one from 

 which the major part of the Coconino tracks were collected. 



Genus OCTOPODICHNUS, new genus 



Generic characters. — Apparently eight footed with tracks arranged 

 in groups of four, alternating, two anterior impressions didactyle. 

 two posterior unidactyle. 



Genotype. — Octopodichnus didactylus, n. sp. 



