80 ON THE STRUCTURES AND DISTRIBUTION OF THE 



The other genera belong to the Malayan Islands, except Xenophrys, which has 

 only been found in the mountains of India. There are no arboreal or aquatic forms 

 embraced in this family. The whole number of species known is five. 



a. Toes free. 



Two coccygeal cotyli. 0. dentale with a dentiform process. Vomer- 

 ine teeth ; no parotoids ; palpebra simple, ..... Crtptotis. 



One coccygeal cotylus. No dentiform process. Head large angular ; 

 upper palpebral border with cutaneous appendages. Vomerine 

 teeth. Tongue entirely adherent. Tympanum hidden, perfect, Asterophrys. 



No dentary apophysis. Head ordinary, no dermal appendages. No 

 vomerine teeth. Tongue broad, but little free. Tympanum 



distinct, Xenophrts. 



aa. Toes partially webbed. 



Very much depressed ; cleft of mouth large. Vomerine teeth little 

 developed. A superciliary dermal appendage. Tongue broad, free 

 behind : (tympanum concealed), Megalophrys. 



PELOBYTIDM. 



Vertebrae procoelian ; no ribs or diapophyses of coccyx. Sacrum united with the 

 coccyx by condyle, its diapophyses thin and largely dilated. Xiphisternum an 

 osseous style, with terminal disc. External metatarsi bound together. 



The species of this family are of weak organization ; the fronto-parietal bones are 

 undeveloped in one of the two genera embraced by it, and they are very weak in the 

 other. Their affinities are altogether between the Asterophrydidas and Scaphiopo- 

 didae. Their vertebrge only distinguish them from the former, and their distinct 

 bicondyloid coccyx from the latter. In both genera the auditory apparatus is 

 developed, and the cephalic integument is free; in neither is there a metatarsal 

 shovel. 



Fronto-parietal bones complete ; no vomerine teeth ; one sacral con- 

 dyle for coccyx : tongue partially free, ..... Leptobrachium. 



Pronto-parietal bones embracing a large fontanelle ; vomerine teeth ; 

 two sacral condyles for the coccyx ; a weak parotoid gland ; pupil 

 elliptic erect ; tongue partially free. Atlas and axis confluent, . Pelodytes. 



BCAPEIOPOBII)^. 



Vertebrae procoelian ; no costal elements or coccygeal diapophyses ; diapophyses of 

 ninth vertebra much dilated, thin and triangular ; coccygeal style without condyloid 



