78 CRUSTACEANS OF THE 



the larger chela is less stout and palm and fingers are 

 less high than in our specimens, but the type has a smaller 

 size, as was already observed. The ambulatory legs are 

 of moderate length, so e. g. those of the penultimate pair 

 of the adult male are 60 mm. long, i.e. almost once 

 and a half as long as the cephalothorax is 

 broad; the meropodites are nearly three times as long 

 as broad, their outer surface is granular, their upper mar- 

 gin is rugose and provided near the distal end with a 

 sharp spine. The propodites of the penultimate legs 

 are in the middle scarcely half as broad as 

 long and in the adult the dactylopodites are somewhat 

 longer. The ambulatory legs are glabrous. In the type these 

 legs appear, as Prof. Hilgendorf wrote to me, a little more 

 slender. The cephalothorax of our specimens preserved in 

 alcohol, has above an olive-green or yellowish-green colour 

 and is mottled with innumerable small red spots, 

 the fronto-orbital margin and the epibrancbial tooth are 

 yellow. The chelipedes and the other legs present above 

 the same green colour and spots, but on the 

 chelipedes the latter are a little larger than on the 

 carapace. The lower surface of the latter and of the legs 

 is yellow and devoid of spots. In the type specimen at 

 Berlin the small red spots are completely wanting. 



Parathelphusa spinigera 'Wh.xie {Qoniex: Wood-Mason, in : 

 Journal Asiatic Soc. of Bengal, Vol. XL, Pt. II, 1871, p. 

 194, PI. XII, Figs. 1 — 4) bears some resemblance to Po- 

 tamon borneense, but is certainly different. I studied two 

 specimens of that species during my last visit to the Bri- 

 tish Natural History Museum in 1896. The cephalothorax 

 is more enlarged, that of an adult male from Calcutta 

 is 59 mm. broad and only 39 mm. long. The post-frontal 

 ridge is better defined , its lateral portions especially are 

 cristiform and sharp ; the free border of the front is 

 slightly concave. The male abdomen has a different form, 

 the penultimate or sixth joint is more quadrate, for in the 

 adult male from Calcutta, that 1 examined, it is 8 '/a mm. 



Notes from the Leyden JMuseum, Vol. X.X.I. 



