260 



ANOURA. — PIPAD^. 



skin differs from that of the Amphibia gene- 

 rally, being covered with minute hard granules, 

 among which are scattered small conical tuber- 

 cles of a horny substance. The male has an 

 enormous larynx, which takes the form of a 

 triangular bony box, within which are two move- 

 able bones, wliich can close the divisions of the 



windpipe, and thus influence the intonation of the 



voice. 



Two species of this singular reptile are known, 

 of which we shall adduce only the Surinam 

 Toad {Pipa Surinamensis ^ Daud.). This is much 

 larger than our Toad, growing to six or eight 

 inches in length ; it is of a dark bro^vn colour. 



