15" 
ZOOLOGY OF THE FAR EAvST. 
the head and body. Both fin-membranes are well-developed and broad. The mouth 
opens ventrally, but the structures connected with it appear to project forwards in 
lateral view. The anterior part of the upper lip is devoid of tubercles and forms a 
kind of hood over the upper beak There is a conspicuous lateral lobe of triangular 
outline on each side. The lower hp is lobulate and covered, except in the middle 
part of the posterior margin, by small but sorrtewhat elongate tubercles. There are 
three uninterrupted rows of teeth, the formula being 1/2. The anterior row forms a 
border to the upper lip and is a little longer than the two posterior rows, which are 
subequal. The beak is extremelj' massive and prominent ; it is entirely black The 
upper beak is regularly crescental in shape and has a smooth margin; the lower beak 
is almost semicircular. The specimens are of an almost uniform darkish black, but 
have probably been discoloured by the use of some fixative. There are apparently 
numerous small tubercles or warts on the dorsal and lateral surfaces of the head, but 
I am not sure that this is not due to bad preservation , the preservative having caused 
the skin to degenerate to some extent. I am unable, perhaps in consequence of 
this circumstance, to detect any muciferous glands. 
Measurements : — 
Length of body . . . . . . . . 10 mm. 
Breadth of body . . . . , . • • 5 
Length of tail . . . . . . . . 13 , , 
Depth of tail . . . . . . . . 6 
The peculiar structure of the beak distinguishes this tadpole from all others with 
which I am acquainted. 
Microhyla achatina (Boie). 
(Plate VI, fig. 6). 
1912. Microhyla achatina, Boulenger, op. cit., p. 261. 
Larva. 
igi'). Microhyla achatina. Smith, Journ. Nat. Hist. Sac. Siam, II, p. 37, pi. , figs. A1-A4. 
Smith has recently described this tadpole from Siam. I obtained specimens 
which agree in all important characters with his figures in a pool in the Botanic 
Gardens at Penang. The most striking feature is 
the peculiar structure of the lower lip, which in 
some respects resembles that of the larva of Mega- 
lophrys montaiia and other species of that genus. 
When the tail is complete it is produced at the 
tip into a distinct flagellum. The colouration is 
Fig. 8.— Tadpole of Microhyla achatina. probably variable. In my specimens it appears 
Mouth-disc as seen from in front. to have been more conspicuous than in Smith's 
(see fig. 6, pi. vi) ; the pale markings on the upper 
part of the head and body and the fleshy part of the tail were of a golden green 
colour, those on the membranes quite transparent; the abdomen was iridescent 
white. 
