214 AN ATTEMPT TO DESCRIBE THE ANIMALS THAT MADE 



improbability is there in the supposition, that the animal which 

 made the tracks at the locality (Turner's Falls) had one of its 

 legs (the right) broken, and that it subsequently united in a 

 wrong position ? 



Affinities of the Genus. — The biped character of the animal 

 and its trifid toes afford a presumption that it was a bird ; yet the 

 great peculiarity of its feet would rather lead us to suspect that it 

 might have been a saurian or batrachian. 



Group V. BIPEDAL BATRACHIANS ? 



Toes four, directed forward, or obliquely forward. Bipedal. 



Genus XII. OTOZOUM. 



Tetradactylous ; pachydactylous ; lobopedate; plantigrade. Toes 

 all directed forward ; the inner one shortest ; the second next long- 

 er ; the third longest of all ; the fourth but little shorter ; all mak- 

 ing distinct phalangeal impressions on mud, the inner toe most 

 distinctly ; three are made by the inner toe, four by the second, 

 and three by the two outer toes. Two bones of the metacarpus (?), 

 articulated to the phalanges of the two outer toes, make a distinct 

 impression. Cushion beneath the carpus rounded beneath, and 

 sloping upward posteriorly. 



Species 1. Otozoum Moodii. (PI. XII. Fig. 1.) 



American Journal of Science, Vol. IV., New Series, p. 55. 



No. 234, in Cabinet. 



Divarication of the outer toes, 35° ; of the inner and second 

 toes, 15°; of the outer and third toes, 12°; of the two middle 

 toes, 5°. Length of the inner toe, 8.6 inches ; of the second toe, 



