552 MR. G. A. BOULENGER ON LITTLE-KNOWN [May 5, 
teeth. The toes are not so strongly fringed in the male, and the 
fore limbs are more robust. 
The skeleton of Pelodytes punctatus is very peculiar. It was 
desirable to ascertain whether the new species conforms in this 
respect to the systematic position assigned to it. Yet it would 
have been a pity to damage in any way an unique specimen. 
Skeleton of Pelodytes caucastcus, from a sciagraph, upper and lower view. 
Thanks to the Rontgen rays, the difficulty was overcome, and I 
have much pleasure in introducing what I believe to be the first 
practical application to herpetology of this startling discovery. I 
wish to thank Mr. J. William Gifford, who, through the mediation 
of my friend Prof. Stewart, kindly undertook to photograph the 
specimen, and to whom I am indebted for the sciagraph from 
which these figures are drawn. 
