PELOBATIDAE 



161 



nicked, and free behind, so that it can be thrown out, except 

 in Aster opli rijs tarpicola of New Guinea, which has a large but 

 entirely adherent tongue. The vertebrae are procoelous, except 

 in Asteropkrys and the Malay genus Megaloplirys, where they 

 are opisthocoelous. The sacral diapophyses are strongly dilated. 

 The omosternum is small and cartilaginous. The metasternum 

 has a bony style, and ends in a cartilaginous, rounded or heart- 



-. L jT/-C"v. i r^ . v/ 



a 



^ CYSTIGNATHIDAE. IIH1H DISCOGLOSSIDAE. Wti. PELOBATIDAE. 

 FIG. 32. Map showing distribution of Cystignathidae, Discoglossidae, and Pelobatidae. 



shaped disc, but in Scaphiopus it forms an entirely cartilaginous 

 plate. The tympanic disc is mostly hidden or indistinct, and is 

 quite absent in Pelobates. The Eustachian tubes are very small in 

 Pelobates, and exceedingly minute in Scaphiopus staynalis of New 

 Mexico. The pupil is vertical. This family contains seven 

 genera with about twenty species, with a rather scattered 

 distribution. 



A. Toes extensively webbed, sacrum and coccyx confluent. 



a. Metasternum a cartilaginous plate. America 



b. Metasternum with a bony style. Europe 



B. Toes nearly free. Metasternum with a bony style. 

 o. Vertebrae procoelous. 



a. Sacral vertebra articulating by one con- 

 dyle with the coccyx. 

 (Europe 

 \New Guinea 

 J3. Sacral vertebra with two 



India and Malaya 

 b. Vertebrae opisthocoelous. 



f Ceylon and Malayan Islands . 

 (New Guinea . 

 VOL. VIII 



Scaphiopus, p. 164. 

 Pelobates, p. 162. 



Pelodytes, p. 165. 

 Batrachopsis. 

 condyles. 



Leptobrachium, p. 166. 



Megalophrye, p. 60 (Fig. 11). 

 Asterophrys. 



M 



