of this long toe distinct impres- 

 sions of three digits which become 

 progressively shortened toward 

 the inner posterior side of the 

 foot are to be noted in two of 

 the tracks. The second and third 

 toes are sharply pointed with a 

 tendency to turn outward as does 

 the fourth. The termination of 

 the short first toe is imperfect 

 but it seems to have a rounded 

 end. It is strongly divergent and 

 is directed straight inward at a 

 right angle to the long axis of the 

 foot. There is no evidence of a 

 fifth digit, but if present it would 

 certainly have been registered be- 

 cause of the depth of the foot 

 impressions as a whole. All of 

 the toes with the exception of 

 the first of the hindfoot are di- 

 rected forward jn line of the 

 course of movement. 



The unusual feature of the 

 tracks of the hindfeet being 

 strongly in advance of those of 

 the forefeet, the reverse of the 

 usual condition, raises the ques- 

 tion of their proper identification, 

 The reasons for considering the 

 deeply impressed tracks as hav- 

 ing been made by the hindfeet 

 are their larger size, narrower 

 trackway, and deeper impression, 

 for otherwise the weight of the 

 body must have rested chiefly on 

 the forefeet — an unreasonable 

 supposition. 



The impressions of the forefeet 

 ofTer but little opportunity for 

 comparison with described forms, 

 but those of the hindfeet bear 

 certain resemblances to the tracks 





^, 



\ 



Fig. 2. — Dolichopodus tetradactylus. 

 Type, No. 11,123. U. S. N. M. Dia- 

 gram of series of footprints. About 

 ^ natural size. 



