CRUSTACEA OF THE MERGUI ARCHIPELAGO. 193 
Ss: . ay 
millim. wmillim. 
Length of the dactylopodites of the last pair 
OY le@s cc ORE SE. ee eee ere ena 7 63 
Memeounvor the hands 2... 0.6 cee s shee ee oe 2 ess 
Length of the penultimate juint of the male 
SiNDC OLODGTIN ih es OP Ns ce ee er At 
104. Srsanma Kraussi, n. sp. (Pl. XIV. figs. 1-3.) 
Sesarma longipes, White, List of the Specimens of Crustacea in the 
Collection of the British Museum, London, 1847, p. 39 (nec Krauss). 
A. single male specimen was found at the island of Kisseraing. 
This species is most closely allied to Sesarma longipes, Krauss, 
from the seas of Natal, and represents it in the Bay of Bengal, 
the two differing from each other only in subordinate characters. 
It will therefore be sufficient if I refer to Krauss’s description 
and figure of Sesarma longipes (Die Siidafrikavischen Crus- 
taceen, Stuttgart, 1843, p. 44, Taf. i. fig. 2), and point out the 
distinctive characters of the new form. 
The anterior margin of the front, which is nearly straight in 
S. longipes, presents a rather deep median sinus in the Indian 
species. In 8S. longipes a single tooth is found behind the ex- 
ternal orbital angle, but in S. Krauss: two teeth are observed 
behind the extraorbital tooth, the posterior one being very 
small. The penultimate joint of the male abdomen in 8S. Kraussi 
is a little longer in proportion to the breadth than in S. lon- 
gipes. The hands of the male are of somewhat different size, 
the left being the larger. The outer surface of the palm is almost 
perfectly smooth, but a few minutely granulated lines occur 
close to the articulation with the wrist; two or three similar 
lines may also be observed on the upper margin of the palm, 
but the convex inner surface is nearly smooth, only three or 
four small tubercles being present near the middle. The fingers 
have pointed tips; the upper margin and the outer surface of 
the mobile finger are perfectly smooth, but the outer surface of 
the index is armed with a longitudinal row of 8-10 small, acute 
tubercles, with some minute hairs between them, the row pro- 
ceeding from the base of the finger to near its horny tip. This 
row of acute tubercles occurs along the middle of the external 
surface of the index, whilst in 8. longzpes it occurs on the 
under margin of the finger. Hach finger is armed along its inner 
LINN. JOURN.—ZOOLOGY, VOL. XXII. 13 
