*s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 


1853. Sesarma lafondi H. Milne-Edwards. Ann. Se. nat., (3) t. 20 p. 
185 — Pacific? 
1887. Sesarma lafondi de Man. Zool. Jahrb. Syst., Bd. 2 p. 647 and 
667 — no locality, description of co-type. 
1892. Sesarma lafondi? de Man. Weber’s zool. Erg. Reise niederl. Ost- 
4 Indien, Bd. 2 p. 331 — Deli (Sumatra). 
1899. Sesarma (Sesarma) lafondi Nobili. Ann. mus. civ. stor. nat. Genova, 
(2) t. 20 p. 506 — Siboga (Sumatra). 
1901. Sesarma (Sesarma) lafondii Lanchester. Proce. Zool. Soe. London, 
1901, p. 550 — Singora (Malay Peninsula). 
XE ieee 
Specimens in the Museum: 
1 OQ, Java. 
Among the dry material of Crustacea in the Museum I found a full- 
grown 9, which seems to me to belong to the present species, though | 
am not yet quite certain of my determination, as the relative length of 
the carapace in proportion to the distance between the external orbital 
angles does not agree with these dimensions, taken by de Man, of the 
co-type, and also the keel on the back of the mobile finger does not 
wholly answer to the description given by the latter author. 
As both de Man and Nobili rightly remarked, the carapace of this 
species is very much like that of Ses. taeniolata White: it is little con- 
vex, in longitudinal as well as in transverse sense, the branchial regions 
are little declivous and the whole surface is smooth and shining on 
superficial examination, though on closer inspection the protogastric 
lobes prove to exhibit a great many longitudinal wrinkles in which, 
during life, probably bunches of hairs are inserted. Proto- and mesogas- 
tric regions are well marked; the mesial groove separating the median 
postfrontal lobes being very deep, not widening distally and the trian- 
gular lobe of the mesogastric region scarcely projects forward into this 
groove. The postfrontal lobes are of the same shape as in Ses. taendolata, 
the median ones about 1'/, times as broad as the outer ones, the latter 
with distinct posterior lobe; all the lobes with rounded anterior margin. 
Front’ vertically deflexed, with parallel and straight lateral margins and 
with two large projections at the fore margin, each of which bears a 
transverse, rather large knob (PI. XV Fig. 1a); there is a deep and 
rather narrow, median sinus (in Ses. taeniolata it is much broader, and 
the middle part of the sinus is straight, not somewhat concave as in the 
present species); laterally these projections do not pass continually into 
