186 PELOBATID^. 



three times in the longitudinal, but little shorter than 

 the urostyle, which articulates by two sockets, and 

 measures three-fifths to two-thirds the length of the 

 remainder of the vertebral column. 



Praecoracoids slender, sti"ongly curved ; coracoids 

 nearly straight, dilated at both ends ; a cartilaginous 

 omosternum ; sternum with a bony style dilated proxi- 

 mally, and a large discoid cartilage. Humerus con- 

 siderably longer than radius-ulna. Carpus with seven 

 elements, three of which are in contact with radius- 

 ulna ; a single bone in the poUex. 



Pelvis three-quarters the length of the vertebral 

 column ; ilia with an inner groove, embracing the 

 sacral processes; the pubis does not ossify. Femur 

 and tibia with the epiphysis cartilaginous ; tibia a 

 little longer than the femur, nearly as long as the 

 pelvis ; calcaneum and astragalus completely fused 

 into a single slender bone with a minute foramen in 

 the middle, resembling the tibia, of which it measures 

 three-fifths the length ; the elements of the distal row 

 of the tarsus are not ossified, and the prsehallux 

 contains two cartilages. Distal phalanx of all digits 

 slightly expanded at the apex. 



Measurements op Skeleton (in millimetres). 



Habits. — This small and graceful Batrachian is essen- 

 tially nocturnal ; only during the breeding season is it 

 met with in the daytime. Its long limbs enable it 



