278 



Ecker ^ ) first fully described the adult vertebral column in the 

 edible Frog and Schwegmann^) has recently produced a paper, dealing- 

 more especially with its metamorphoses in the late larvae of R. tempo- 

 raria. Both authors deal exclusively with the normal skeleton; 

 Bourne ^) has however described two abnormal backbones , to which 

 I refer below. 



A. 



The entire vertebral column, dorsal aspect. 



The three posterior vertebrae of the same, from beneath. 



The ninth vertebra, hind view. 



The tenth vertebra, hind view. 



The head of the urostyle, from the left side. 



1) Die Anatomie des Frosches. Part 1. Braunschweig 1864. 



2) "Entstehung und Metamorph, d. Wirbelsäule v. R. temporaria" 

 Zeitschr. f. Naturw. Halle. Vol. 57. Part 6. 1884. 



3) "On certain abnormalities in the common Frog". Q. J. M. S. 

 Vol. 24. 1884. 



