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Show 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 passing backwards along the whole length of the side of the back to the lateral margin of the anus. A. Pachybatrachus robustus, nat. size. B. Interior of mouth of ditto. All the digits of both limbs have their extremities somewhat enlarged, 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 |