80 The Naturalist in La Plata. 
to a level with the head, closing the eyes completely, 
and giving the creature the appearance of being 
eyeless. The upper jaw is armed with minute 
teeth, and there are two teeth in the centre of the 
lower jaw, the remaining portions of the jaw being 
armed with two exceedingiy sharp-edged bony 
plates. In place of a tongue, it has a round 

Ceratophrys ornata. 
muscular process with a rough flat disc the size ofa 
halfpenny. 
It is common all over the pampas, ranging as far 
south as the Rio Colorado in Patagonia. In the 
breeding season it congregates in pools, and one is 
then struck by their extraordinary vocal powers, 
which they exercise by night. The performance in 
no way resembles the series of percussive sounds 
uttered by most batrachians. The notes it utters 
