CEUSTACEA, 221 



lower surfaces of tte hands ; the front is moderately deflexed, and is 

 divided by a median notch into two rounded lobes ; the antero-lateral 

 margins are somewhat shorter than the posfcero-lateral, with only 

 the three posterior teeth distinct, these are smaE and spiuiform. 

 The orbits are tuberculated on their, margins, but without any dis- 

 tinct spinules ; the inner suborbital angle is rather prominent. AU 

 the postabdominal segments are distinct in both sexes. The basal 

 antennal joint apparently does not reach to the front ; the merus- 

 joint of the outer maxiUipedes is short and transverse ; the cheli- 

 pedes in the male have the merus-joint short and trigonous, with a 

 tooth near the distal end of its upper margin ; carpus and palm 

 granulated on their outer surface, but the granules for the most 

 part concealed by the pubescence ; there is a small tuberculiform or 

 subspiniform tooth on the inner margin of the carpus or wrist ; the 

 hand (for so small a species) is large, its inner surface naked, smooth, 

 and polished, and the granulations usually obsolete on the naked 

 part of the outer surface in the larger chelipede ; the fingers are 

 chocolate-brown, the coloration not extending over any part of the 

 palm, and the upper finger has scarcely any traces of teeth on its 

 inner margin. The ambulatory legs are closely pubescent. Length 

 of the largest male in the collection a little over 4| lines (10 millim.), 

 breadth about 6g lines (14 millim.) ; length of largest chelipede 

 about 10| lines (22 millim.). 



Ten specimens are in the collection, from Port Jackson, 5-7 fms. 

 (No, 104). 



Either the right or the left chelipede may be the larger in the 

 male. Occasionally the granulations of the hands are distinct even 

 upon the naked part of the outer surface ; there are several females 

 in the series of very small size, yet bearing ova. 



There is in the British-Museum collection a specimen from Percy 

 Island {H.M.S. ' Herald '). Possibly also a small male from Tas- 

 mania {R. Ounn) is to be referred here. 



Piaally, there are in Dr. Coppinger's collection a series of very 

 small specimens from Port Denison, 4 fms. (No. Ill), of much 

 paler colour than those collected at Port Jackson, and two from 

 Port Curtis, 11 fms. (No. 87), which perhaps belong to this species. 

 This species bears some resemblance to P. hirsutus, Stimpson, 

 which Mr. Haswell records from Port Jackson, but differs (in the 

 adult at least) in the close brown pubescence, and in having a series of 

 tubercles or small spines on the carpus (not merus) of the ambulatory 

 legs. In the specimens from the Japanese or Corean seas referred 

 to P. hirsutus in the Museum collection there is but a single spinule 

 at the distal end of the carpus of these legs. Pilumnus fissifrons, 

 Stimpson, from Port Jackson, differs in having the carapace 

 distinctly areolated and the antero-lateral marginal teeth normally 

 developed. 



If our specimens should prove to belong to an undescribed species, 

 I would propose for them the name of P. Tiumilis. 



