156 



S. J. DE BOLKAY 



(2) 



high and lasting merits. I am also greatly indebted to Mr. Theo. Kormos 

 for allowing me to dispose of the material and to my friend Baron 

 G. J. DE Fejervary who gave me recent material to compare with. 



Rana Mehelyi By. n. sp. 



Skull. Considering the rather cartilaginous construction of the 

 frog-skull no iniportant reraains are left. The collection contains alto- 

 gether biit 4 fragraentary pieces of maxillary. 



Vertebral column. All the more rieh the collection of ver- 

 tebrae. Beginning from the atlas, down to Ihe os sacrum all the ver- 

 tebrae are represented in many specimens. No urostyle could be 

 found. Goncerning the vertebrae in general it may be observed that 



t^"^-^ 



Fig. 2. R. Mehelyi n., fragmen- 

 tary piece of maxillary. ('/i) 



Fig. 3. B. Mehelyi n. B'^ ver- 

 tebra. C/i.) 



from the hardly one year old specimens np to the oldest ones all the 

 possible transitions existing between the two extremes are pi-esent. 

 The vertebrae of the oldest specimens exceed in size those of tlie 

 oldest ones of the Gommon-frog. Atlas much broader and shortcr than 

 that of the Gommon-frog. There is a prominent bony ridge on the 

 middle part of the posterior margin of the third vertebra's transverse 

 process. This bony ridge has degenerated in the recent Ruuu fusca 

 Rös., or occurs here and therc merely as a slight remainder. 



4_9th vertebra do not differ from those of Rana fuftca Rös., the 

 nem-al spines alone are more strongly developed. I also found some 

 interesting cases of fusion of vertebrae. In one of them the first and 

 second in two cases the 8 and 9'h vertebrae were fused into each other. 



Pelvis. The most characteristic features of the new species are 

 to be found on the pelvis. One pelvis only is almost complete. The 

 ilea alone being all that is left of the rest (106 by number) Füll 

 attention mu.st be directed to the foot of the protuberance or knot 



