222 CrSTIGNATHID^. 



II. Upper eyelid produced into a horn-like appendage. 



A. No dorsal shield. 



Sides of head and body with triangular 

 skinny appendages ; metatarsal tu- 

 bercle reaching beyond the eye .... 2. appendiculata, p. 222. 



Metatarsal tubercle not reaching beyond 

 the eye ; interorbital space concave ; a 

 \evy distinct ridge between the eyes . 3. hoiei, p. 223. 



Interorbital space deeply concave .... 4. fryi, p. 223. 



Head very much elevated ; tympanum 



visible 5. cornuta, p. 224. 



B. A bony dorsal shield. 



Head with symmetrical ridges 6. dorsata, p. 225. 



III. Upper eyelid slightly pointed, triangular. 



A bony dorsal shield 7. ornata, p. 225. 



IV. Upper eyelid simple. 



K^o large gland on the calf 8. americana, p. 226. 



A large paratoid-like gland on the calf. 9. cultrijpes, p. 226. 

 The tip of the fourth toe does not reach 



beyond the eye 10. leyboldii, p. 227. 



1. Ceratophrys bigibbosa. 



Ceratophrys boiei, Hensel, Arch.f. Katurg. 1867, p. 121. 

 bigibbosa, Peters, Mon. Bek. Ac. 1872, p. 204. 



P.esembles C. hoiei, but differs by remarkable characters. The 

 upper eyelid is not produced into a horn, but bears several pointed 

 papillae, as in Asterroplirys turjpicola. There is a round swelling of 

 the skull, resembling a paratoid, above and somewhat behind the 

 eye. ]N^o dermal ridge on the back. This species is founded on a 

 young specimen (36 millim.). 



Eio Grande do Sul, Erazil. 



2. Ceratophrys appendiculata. (Plate XV. fig. 1.) 



Ceratophrys appendiculata, GUnth. Ann. 8f Mag. N. H. (4) xi. p. 418. 

 cafleri, Camerino, Att. Ac. Torin. xiv. p. 880. 



Vomerine teeth in two small groups between the choanae. Head 

 large, depressed ; nostril nearer the ej'e than the tip of the snout ; 

 snout terminating in a short triangular Hap ; upper eyelid produced 

 in a horn-like appendage, the length of which is more than the 

 greatest orbital diameter ; interorbital space concave ; tympanum 

 hidden. First and second fingers equal ; toes webbed at the base ; 

 subarticular tubercles well developed ; inner metatarsal tubercle 

 oval, blunt ; no tarsal fold. The hind limb being carried forwards 



