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relief about half an inch above the surrounding surface or bed 

 of the slab, and must therefore have been impressed to a cor- 

 responding depth in the upper bed of the substratum. 



Pig. 2nd — Lithograph of a cast of an impression of an 

 animal's foot, with three perfect toes and a rudimentary fourth. 

 The remarkable singularity of the cast is, that the upper sur- 

 face of the feet appears to have been enveloped in a hard horny 

 or bony case, which descended to the under sides of the toes 

 and soles of the feet, and nearly overlapped them. The edges 

 of the casing are very clearly shown on the cast, and stand in 

 good relief. There were only two impressions of the kind on 

 the surface of the slab, about 18 inches apart, and were right 

 and left. 



These beautiful lithographs were executed by our talented 

 member, Mr. Pidgeon. 



Pig. 3rd — Wood-cut (half size) of the cast of an impression 

 of a web-footed animal with three toes — probably a bird. 

 There were two impressions of the same foot on the slab, 

 about 1 foot 6 inches apart, 



Pig. 4th — Wood-cut (half size) of a cast of an impression 

 of the foot of a reptile, with three distinct toes and a rudimen- 

 tary fourth. 



Pigures 1st, 2nd, 3rd and 4th were found on slabs from 

 Stourton Hill quarries, and are different from any others pre- 

 viously found there. 



Pig. 5th — Wood-cut (full size) of the cast of an impression 

 of the foot of an animal allied to the cheirotheriam, and, accord- 

 ing to Professor Owen, must have been a batrachian. The 

 slab on which the impressions were found was taken out of 

 the cutting of a road in Playbrick Hill, Birkenhead. There 



