346 Fossil Footmarks found in Westmoreland County^ Pa. 



inches, leaving an interval of one inch between each toe ; the 

 ball of the foot is round and nearly two and a half inches over. 

 Spheropezium pachydactylum, (fig. 4.) Toes 5, short and 

 thick ; the imprint of both toes and ball is deep ; spread of the 

 toes about the same as the preceding. The nails are perceptible 

 on both tracks. 



Fig. 4. 



Reduced one half. 



Spheropezium thcBrodactylum, (fig. 5.) Toes 5, spherical and 

 subconical, arranged in a circle, spreading about 240°, or two 

 thirds of a circle. The ball of the foot is also spherical, and 

 nearly two inches across. The track is four inches each way. 



Fig. 5, h. 



Fig. 5, a. 



Reduced one half. 



Reduced one half. 



The length of the step could not be ascertained. In the specimen 

 before us the ball of the foot is in the centre, the toes spreading 

 regularly around it. (See fig. 5, a.) In other tracks, apparently 



