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he feather-like trail which accompanies the series of foot- 

 prints, six in number, on a slab of Connecticut river red sand- 

 stone, in the Amherst museum, three feet long. Length of 

 hind foot 6 in. ; of fore foot 3| in. ; step of hind feet 12| in. ; of 

 fore feet 12 to 14 inches ; toes clawed, but no joints ; hind and 

 fore feet sometimes in contact, sometimes 3 inches apart and 

 nearly abreast of each other. Distinct grooves follow the trail, 

 and to the left of them several groups of round holes as if made 

 by the blunt ends of a bundle of sticks dragged along, lifted 

 up and then implanted. On the left hand groove, for six inches 

 of it, its sides are remarkably feathered. Had the beast a 

 feathered tail? The tail had several ends and could be used 

 to stand on. The animal was evidently a quadruped, and 

 seems to prophesy the appearance of the bird-lizards of a later 

 age. — Trias, 



lethomytilus arenaeeus, Hall. {Mytilarea arenacea,) 

 Pal. N. Y. Vol. 5, pt. 1. Schoharie. VII h. 



