144 
MR, W. K. PARKER OK THE STRUCTURE AND 
12. Columella extremely minute, generalised, and completely ossified. 
13. The two cerato-hyal centres, the short basal plate, and the minute size of the 
anterodateral lobes. 
I might, perhaps, add 
14. A single fontanelle. But this is doubtful; there is only one in Bombinator. 
I. A. b. —PLATYDACTYLA. 
First sub-clivision. — Tree-frogs with narrow sacral apophyses and no neck-glands. 
First Family. Polypedatida:, 
First genus. Polypedates. 
35. Polypedates cliloronotus. —Adult male ; 2 inches long. India, 
The difference between this skull and the next (Plate 26, figs. 1, 2 ; and Plate 27, 
figs. 1, 2) lies mainly in its general form ; its shape is half a long ellipse, and the 
length is to the breadth as Sir to 7§—an almost exact reversal of the proportions seen 
in the other. 
The mid and hind skull are greatly affected in their shape by this, the parotic pro¬ 
jections being much less and the orbital region much longer; it is also much narrower. 
The nasal region has lost little of its breadth, but the ethmo-palatines are shorter 
and lie within less divergent maxillaries; its three fontanelles are normal. The 
occipital condyles (Plate 26, figs. 1, 2, oc.c.) are very similar in both; they are oval, 
posterior, and separated by a concave emargination, which is narrower in this species 
than in the other. Here the ossification is more intense in the hind skull; the bony 
masses of the two sides ( pr.o ., e.o.) are confluent both above and below, and there is 
scarcely any cartilage left—it is only seen at the outermost part where the pedicles 
articulate—and the bone reaches half-way between the foramen ovale and the foramen 
opticum (V., II.). But the girdle-bone (eth.) is somewhat more restricted, and only 
reaches to the middle of the orbits; likewise in front it does not run along the 
septum nasi, but the whole bone stops short a little behind the margin of the proper 
ethmoidal region. 
O 
The sinuosity of the bounding lines of the mid-skull is similar in both, but the 
curves are gentler in this narrower skull. The actual breadth of the nasal roof and 
floor is but little less in this kind, and the snout is more directly transverse as in 
Rhacophorus maximus (Plate 26, figs. 5, 6). The pro-rhinals (fig. 2, p.rh.) are large, 
and the septum nasi ( s.n .) is very thick and solid, as is seen both from the upper and 
lower surfaces. The double palato-suspensorial bow (with its outworks) is rather 
tightly drawn ; and the quadrate hinges ( q.c.) retreat a little less than in the next kind. 
