2l6 ANURA CHAP. 



a length of 6 inches. The upper eyelid is transformed into a 

 triangular horn, whence a cutaneous ridge extends all along the 

 side of the back, meeting that of the other side above the vent. 

 There is no osseous shield on the back. The tympanum is 

 hidden. Ground-colours, orange or green, with sharply marked 

 dark brown or blackish patches. 



C. corimta, in Northern Brazil, lacks the dorsal shield, but has 

 horned eyelids and a visil)le tympanum. Its coloration renders 

 it one of the most beautiful toad-like creatures known. The 

 ground-colours are green, black and brown, with an orange-yellow 

 stripe over the head and back. All these colours are most pleasingly 

 blended and arranged in marbled patches or stripes radiating 



Fk;. 4o. — (_'enitoj/hri/s oniata. lloriiL-d 'J'oiul. ;-s i- 



from various centres, as, for instance, from the eyes towards the 

 circumference of the mouth, the slit of which they pass, the 

 same line of the pattern being continued upon the lower jaw. 

 The whole surface makes the impression of a gay but ex- 

 quisitely harmonious carpet. The under parts are yellow, in- 

 clining to white towards the middle. 



C. ornata has a dorsal shield. The tympanum is just visible, 

 and the eyelids form only low but sharp-edged projections. This 

 is likewise a beautiful toad, living chiefly in Uruguay, Northern 

 Argentina, and Paraguay, where it is universally known as the 

 " escuerzo," one of the Spanish words signifying a toad. Its size 

 rarely surpasses 4^ inches. The ground-colours are greenish 

 and yellow, with large dark green patches on the back, decreasing 



