Crustacea Decapoda and Stomatopoda . 249 



Family XANTHIDAE. 



Subfamily MENIPPINAE. 



Genus Myomenippe, Hilgendorf. 



Myomenippe granulosa (A. Milne-Edwards). 



1S98. Menippe (Myomenippe) granulosa, Alcock, Journ. Asiat. Soc. Bengal, LXVII, p. 179. 



Two small specimens, the largest with carapace i8'5 mm. in breadth, were found 

 at the mouth of the Prai River, opposite Penang, on mud flats left bare at low tide. 



Subfamily PILUMNINAE. 



Genus Pilumnus, Leach. 



Pilumnus quadridcntatus, de Man. 



1888. Pilumnus seminudus, de Man, Journ. Linn. Soc, XXII, p. 65. 



1895. Pilumnus {Parapilumnus) quadridenlatus, 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 foi"wards than in de Man's .--^?^. .' 



figure and each is oval in outline and is produced exter- f 

 nally forwards and outwards towards the middle of the ] 

 orbital margin (text-ng. 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 Y~-. 



easily removed in cleaning the carapace and leave prac- "'"*"' 



tically no trace of their existence. Fig. 6. — Pilumnus quadridentatus. 



The granulation of the outer surface of the palms ^^ ^"' 



of the chelipedes is conspicuous in all the specimens, the 



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. malar di, 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) 



