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POPULAR SCIENCE MONTHLY 



Fig. 1. The Type of Pelion lyelli Wyman from the Carboniferous of Ohio. In the 

 collection oi the American Museum. Natural size 



the lesser part of the skull went to Dr. Newberry, and in some way 

 the other half of the slab containing the major portion of the cranial 

 elements was obtained by Mr. W. F. E. Gurley and it is now in the 

 collection of the University of Chicago. The illustration is made from 

 the latter specimen. This form is peculiar in the possession of horns 

 which projected hack ward over the neck. Jaekel suggests that these 

 horns were tor the protection of the external gills, but the Microsauria, 

 so far as we know, had no gills, at least in the adult state. 



Geologically the record of the amphibians, as it has been given, is 

 the correct one, but chronologically it is not. Long before a single 

 specimen had been taken from the Linton beds Sir William Logan, in 

 1842, found evidences of amphibians in the Carboniferous of Nova 

 Scotia in some footprints later named by Dawson Hylopus logani. 

 These footprints Logan took with him to London and submitted them 

 to the famous paleontologist, Sir Richard Owen, who unhesitatingly 

 pronounced them to be " reptilian." Logan's discovery constitutes the 

 earliest recognition of amphibians in the Carboniferous. A few years 



