450 AMPHISN.lTEODD]SrriDJE. 



1. AMPHIGNATHODON. 



Pupil horizontal. Tongue subcircular, indistinctly nicked, and 

 sliglitly free behind. Vomerine teeth. Fingers free ; toes webbed, 

 the tips dilated into large disks. Outer metatarsals united. Pemale 

 with a dorsal pouch, as in Nototrema. No omosternum ; sternum a 

 cartilaginous plate. Diapophyses of sacral vertebra strongly dUated. 

 Terminal phalanges claw-shaped. 



Ecuador. 



This genus differs from any other of the tailless tribe in having 

 the lower jaw furnished with teeth, which are exactly the same as 

 those of the upper jaw. In Hemijphractus and Ceratohyla the man- 

 dibular teeth are quite different, and must rather be considered 

 odontoids than true teeth. In Ampliodus they are very strong and 

 few in number. But in the present genus the teeth of the lower 

 as weU as of the upper jaw are small, elongated, closely set — in 

 fact exactly the same as those of the upper jaw of the toothed 

 Batrachians. 



1. Amphignathodon guentheri. (Plate XXX.) 



Yomerine teeth in two oblique series commencing from the inner 

 posterior corner of the choanse. Head much broader than long, 

 bony, rough, the derm involved in the cranial ossification ; snout 

 extremely short, vertically truncate ; canthus rostralis angular ; 

 crown' deeply concave; interorbital space broader than the i;pper 

 eyelid ; tympanum smaller than the eye, turned backwards. Fingers 

 slender, first a little shorter than second, the tips dilated into large 

 disks ; toes half webbed, tlie disks smaller than those of fingers ; 

 subarticular tubercles moderate. The hind limb being carried for- 

 wards along the body, the tibio-tarsal articulation reaches beyond 

 the tip of the snout. Skin finely tubercular above, granulate on the 

 belly and under the thighs ; upper eyelid with a pointed dermal 

 appendage ; heel with a dermal spur. Olive above, the Ijorders of 

 the dorsal pouch black ; a few whitish dots on the head and the sides 

 of the body ; a black, white-edged streak along each side of the body ; 

 upper surface of thighs whitish, with numerous black cross bars, 

 which are broader than the interspaces between them ; arms and 

 legs with rather indistinct cross bars; beneath light greyish brown. 

 From snout to vent 75 millim. 



Ecuador. 



a. 2- lutac. Mr. Buckley [0.]. 



The following genus should perhaps enter this family : — 



GBYnscTJs, Cope, Journ. Ac. Philad. (2) vi. 1867, p. 205. 



" Mandible with a series of caducous pleurodont teeth, and a 

 prominent elevated tooth on each side the symphysis. Prefrontal 

 bones fully developed, in contact with each other " throughout, and 



