558 



MR. ST. GEORGE MIVART ON 



[Nov. 12, 



aperture, immediately above the tympanum ; there it bifurcates, one 

 branch descending obliquely downwards and backwards behind the 

 tympanum to the root of the pectoral limb, the other branch pass- 

 ing backwards along the whole length of the side of the back to the 

 lateral margin of the anus. 



A. Tachyhatrachus robusius, nat. size. B. Interior of mouth of ditto. 



All the digits of both limbs have their extremities somewhat en- 

 larged, and there are subarticular tubercles. The fingers are very 

 well developed and quite free. They are normally disposed, neither 

 the first two nor the first alone being opposite the others ; the third 

 is the longest, then the first and fourth, which are of nearly the same 

 length ; the second finger is the shortest. When the limb is turned 

 backwards the longest digit attains the posterior margin of the middle 

 of the body. There is a considerable prominence on the palm at 



