TAILLESS BATRACHIANS 



201 



behind ; the fingers are free, the toes, with simple or 

 dilated tips, are more or less webbed. The pupil is 

 horizontal. The tympanum may be large and very 

 distinct, or entirely hidden. 



The Common Frog, R. Umporaria, inhabits the whole 



A 



:..^ 



B 



Fig. 14. — Pectoral Arch and Fore-limb of (a) Discoglossus pictus, 

 showing Arciferous type, and (b) Rana esculenta, showing Firmister- 

 nian type. 



(After Boulenger.) 



of Northern and Central Europe, and extends across 

 Northern Asia to Eastern Siberia and Northern Japan. 

 The snout is rounded and only slightly projecting beyond 

 the mouth. The skin is perfectly smooth, or with only a 

 few irregular, smooth warts, and with a dorso-latcral 

 glandular fold. Males differ from females in the greater 

 development of the web between the toes, which is almost 



