Reptiles and Batrachians from Madagascar. 247 



Platthyla, g. n. [Dyscophidarum] . 



Pupil horizontal. Tongue large, oval, entire, and free 

 behind. Palatine teeth * in two long, oblique, transverse 

 series, converging posteriorly, separated by a narrow inter- 

 space. Tympanum hidden. Fingers and toes webbed at tlie 

 base, the tips diUited into very large disks supported by a Y- 

 shaped terminal phalanx. Outer metatarsals united. Cora- 

 coids strong ; prtecoracoids very slender, bent nearly at right 

 angles, only the proximal half ossified ; omosternum very 

 small, cartilaginous ; sternum a small cartilaginous plate. 

 Diapophyses of sacral vertebra moderately dilated. 



The following analysis shows the relations of this new 

 genus to the other members of the family Dyscophida3 : — 



I. Pupil vertical ; palatine teeth iu long 



transverse series. 



A. Prjecoracoids ossified ; tips of fingers and 



toes not dilated. 



Sternum very large 1. Dyscophus, Grand. 



Sternum small 2. Calluella, Stol. 



B. Praecoracoids not ossified ; tips of fingers 



and toes dilated 3. Flethodontohyla, Blgr. 



II. Pupil horizontal. 



A. Palatine teeth in long transverse series. 



1. Prsecoracoids ossified ; tips of fingers 



and toes dilated. 



Fingers and toes free ; prfecoracoids entirely 



ossified 4. Mantipus, Ptrs. 



Fingers and toes webbed at the base ; praj- 



coracoids semiossified 5. Platyhyla, Blgr. 



2. Prsecoracoids not ossified ; tips of fin- 



gers and toes not dilated 6. Phrynocara, Ptrs. 



B. Palatine teeth in one or two small groups ; 



praecoracoids ossified; tips of fingers 

 and toes dilated. 



Two small groups of teeth on the palate .... 7. Platypelis, Blgr. 

 A single small group of teeth in the middle of 



the palate 8. Cophyla, Bttg. 



Platyhyla grandis. 



Series of palatine teeth forming together an obtuse angle, 



• The so-called vomerine teeth are inserted on the palatine bones in 

 the Dyscophidae. 



