Lali 
j i j 
shorter than in S. aspera, Heller, being much shorter than 
the propodites ; they are a little spinulose. 
Dimensions of the two largest specimens in the collecticn, the 
female being provided with eggs :— 
CRUSTACEA OF THE MERGUI ARCHIPELAGO, 175 
Vaile erie: 
Distance between the extraorbital teeth.. 12% 103 
Length of the cephalothorax .......... OF: 72 
Breadth of the front between the eyes .. 74 54 
In the smallest ova-bearing female, the distance between the 
extraorbital teeth measures only 8 millim. 
Szcrron C.—Sesarme in which the cephalothorax is armed with 
an epibranchial tootb behind the extraorbital tooth, and in 
which the upper margin of the palm of the anterior legs of 
the male presents two or three oblique, parallel, minutely 
pectinated ridges. 
Thissmall section contains only the following Oriental species : — 
Sesarma bidens, de Haan. 
Dussumieri, M.-Edw. 
guttata, A. M-Kdw. 
livida, A. M.-Edw. 
I am now enabled to adda fifth species, viz. Sesarma Haswelli, 
n.sp. It is extremely difficult to distinguish these species, but 
a careful examination of the typical specimens, preserved in 
the Museums of Leyden and Paris, enables me to enumerate 
their distinctive characters. 
Each species seems to be proper to different parts of the 
Indo-Pacific Region. Sesarma bidens inhabits the Japanese and 
Chinese seas and the Malayan Archipelago (Amboina) ; S. Has- 
welli and S. Dussumiert seem to be proper to the northern and 
north-eastern part of the Indian Ocean; S. livida has been 
recorded from New Caledonia, and seems to inhabit also the 
Gulf of Bengal; and, finally, S. guttata occurs on the south- 
eastern coast of Africa. 
These closely allied species may be Hetreneion by the form 
of the hands, the number of tubercles with which the mobile 
finger is provided, the form and the structure of these promi- 
nences, and by the shape of the joints of the male abdomen. 
96. SusarmMa HaswELLt, n. sp. 
(Compared with a typical specimen of Sesarma bidens, de H.) 
Two young male specimens were collected at Sullivan Island. 
ak 
