Crustacea Decapoda and vStomatopoda. 
249 
Family XANTHIDAE. 
Subfamily MENIPPINAE. 
Genus Myomenippe, Hilgendorf. 
Myomenippe granulosa (A. Milne-Edwards). 
1898. Menippe {Myomenippe) granulosa, Alcock, Journ. Asial. Sac. Bengal, LXVII, p. 179. 
Two small specimens, the largest with carapace 18 5 mm. in breadth, were found 
at the mouth of the Prai River, opposite Penang, on mud flats left bare at low tide. 
Subfamily PIL UMNINA E . 
Genus Pilumnus, Leach. 
Pilumnus quadridentatus, de Man. 
I 
Pilumnus seminudus, de Man, Journ. Linn. Soc, XXII, p. 65. 
1895. Pilumnus (Parapilumnus) quadridenlatiis, de Man, Zool. Jahrb. Syst., VIII, p. 537 and 
IX, pi. xiii, fig. 6. 
1906. Pilumnus quadridentatus, Nobili, Ann. Sci. nat., Zool. (9), IV, p. 278. 
A male and an ovigerous female, 9-3 mm. and 8 8 mm. in breadth respectively, 
were found in dead shells of Balamis on fishing stakes in the channel off Singgora at 
the mouth of the Tale Sap. A very young individual, with carapace only 5 mm. in 
breadth, was also found among mangrove roots near Koh Yaw. 
In addition to the long hairs on the upper surface of the front and to those which 
extend inwards in a curved line from the last tooth of the antero-lateral margin, there 
are two conspicuous setose areas on the gastric region. 
These are situated further forwards than in de Man's 
figure and each is oval in outline and is produced exter- 
nally forwards and outwards towards the middle of the 
orbital margin (text-fig. 6). In a specimen from Mergui, 
one of those identified by de Man in 1888 as P. seminudus, 
Miers, I can find no trace of these patches ; but they are 
easily removed in cleaning the carapace and leave prac- 
tically no trace of their existence. Pig. 6.— Pilumnus quadridentatus, 
The granulation of the outer surface of the palms 
of the chelipedes is conspicuous in all the specimens, the Carapace, 
larger granules being arranged in longitudinal rows. De Man notes that in very large 
males the granules almost completely disappear. 
In all other respects the specimens agree very closely with de Man's detailed des- 
cription. The species is evidently closely allied to P. malardi, de Man,' a form also 
found in dead Balanus shells, but differs in the shape of the front and the form of the 
teeth on the antero-lateral margin. 
De Man, Bull. Soc. Zool. France, XXXIX, p. 330(1914) 
