172 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
Sesarma picta may be easily distinguished from Sesarma 
quadrata, Fabr. (=affinis, de Haan=ungulata, M.-Hdw.), from V. 
aspera, Heller, and from 8. erythrodactyla, Mess, by its narrow 
front, which is exactly half as broad as the distance between the 
external orbital angles. The ambulatory legs of S. picta, de 
Haan, are moreover of a more slender form than those of S. 
guadrata. 
Sesarma picta has been found in Japan, and the Leyden 
Museum possesses a specimen from Macassar, Celebes; it is 
therefore probable that this species will be found to occur in the 
Malayan Archipelago. 
95. SesaRMA ANDERSONI,n. sp. (Pl. XII. figs. 1-4.) 
Nineteen specimens (8 ¢, 11 @ ) of this most interesting species 
were “found at low water, in the deep but narrow burrows of 
dead Novaculina sp., on the banks of the Tenasserim river, at 
Minthantoung.” 
The numerous species of the genus Sesarma nearly all agree 
with one another, so far as | am aware, in one character, namely, 
that the posterior margins of the meropodites of the ambulatory 
legs are entire, and never armed with the acute teeth which are 
characteristic of the more typical Grapside. In only a single 
species, viz. the Japanese Sesarma vestita, Stimpson, are the mero- 
podites of the ambulatory legs described as being denticulate at 
the external angle of their posterior margin. ' 
Sesarma Andersoni appears to be allied to S. vesteta, but may 
be distinguished from it at first sight by its much more enlarged 
carapace, which has a glabrous and shining upper surface, and 
by many other characters. WS. vestita and this new species are 
among the smallest representatives of this interesting genus, the 
cephalothorax being little more than one centimetre broad. 
The cephalothorax is enlarged, being much broader than long ; 
the proportion of the distance between the external orbital angles 
to the length of the carapace is as 13:93. The rather depressed 
upper surface is marked with the ordinary interregional grooves 
and is quite glabrous, smooth, and bright, though minutely 
punctate, when seen under a magnifying-glass. The front is 
rather broad; measured between the eye-peduncles, its breadth 
slightly exceeds half the distance between the external orbital 
angles, the proportion being as 72:13. The front is vertically 
deflexed, its anterior margin is nearly straight, not at all 
