Mr. E. J. Miers on Malaysian Crustacea. 235 



Pilumnus Ursulas, Adams and White, Zool. Sarnarang, Cr. p. 45, pi. ix. 



fig. 6 (1848) ; Hess, Arch. f. Nat. p. 137, pi. vi. fig. 2 (1865). 

 Pilumnus mus, Dana, Pr. Ac. Nat. Sci. Phil. p. 82 (1852) ; U.S. Expl. 



Exp. xiii. Cr. i. p. 240 (1852). 



Java (a female). 



The hairs covering the body of this species vary from a 

 deep brown to a fulvous or cinereous hue. The small tooth 

 of the antero- lateral margins, situated anterior to and on a 

 lower level than the first of the proper antero-lateral marginal 

 teeth, and which is mentioned both by Milne-Edwards (in P. 

 vespertilio) and Dana (in P. mus), is not invariably developed. 

 This is a very common and generally distributed inhabitant 

 of the Australian, Malaysian, and Pacific seas. 



Kossmann (Zool. Ergebn. des rothen Meeres, Brachyura, 

 p. 38, 1877) has recently subdivided the genus Pilumnus into 

 three subgenera, based on characters derived from the presence 

 or absence of fissures in the upper orbital margin. P. ves- 

 pertilio belongs to the subgenus Pilumnus as restricted by him, 

 as there are usually indications of two fissures in the upper 

 orbital margin. I doubt, however, the constancy of these 

 characters, or their validity as a means of separating the 

 species, much as the genus Pilumnus requires subdivision into 

 smaller groups. 



Pilumnus Bleekeri, sp. n. 



Carapace convex, with the antero-lateral margins shorter 

 than the postero-lateral, and armed with five rather long spines 

 (including the extraorbital spine) ; the spine next to this is 

 placed on the subhepatic region. The body and legs are 

 rather thinly clothed with long fulvous hairs ; the front is 

 divided by a rather wide and deep fissure into two truncated 

 lobes. The orbits are armed with a series of prominent spinu- 

 liform teeth on their lower margins ; but the upper margin is 

 only minutely granulated, and is without fissures. The ante- 

 rior legs are robust ; the arm has three teeth on its upper 

 margin ; the wrist and palm are hairy ; the palm is covered 

 with rather irregularly-disposed granules on its outer surface, 

 which toward the upper margin tend to become spinuliform ; 

 toward the lower margin the surface is smooth ; but there is a 

 line of granules on the lower margin of the hand. The fingers 

 are short and thick, denticulated on their inner margins ; the 

 upper is granulated above at its base ; the lower margin of the 

 immobile finger forms a straight line with the inferior margin 

 of the palm. Length 9 lines, breadth 1 1 lines. 



New Guinea. Two males are in the collection. In the 



