CETJSTACBA. 223 



be at once distinguislied by the following characters : — The carapace 

 is broader in proportion to its length, and its anterior parts clothed 

 with a close velvety pubescence, which also extends over the npper 

 and outer surface of the wrist and palm of the chelipedes ; the two 

 posterior teeth of the antero-lateral margins are more distinctly 

 spiniform, the basal antennal joint does not nearly reach to the sub- 

 frontal process ; the granulations of the wrist and palm are much 

 more inconspicuous, those of the outer surface of the palm appear, 

 through the pubescence, to be arranged in four distinct longitudinal 

 series (fig. c) ; the ambulatory legs are slenderer. 



Colour (in spirit) purplish brown, hairs cinereous. Length of the 

 largest specimen, a female, about 5g lines (nearly 12 millim.), 

 breadth about 7| lines (16 mUlim.). 



There is a male in the first collection from Port Denison, 4 fms. 

 (No. Ill), and a female in the second collection from Thursday 

 Island, 4-5 fms. (No. 165). 



Mr. Haswell has described a species (^Pilumnus inermis*) from 

 Port Jackson which apparently resembles this and the preceding 

 species in having the anterior parts only of the carapace clothed 

 with hairs, which are long as in P. semilanatus. It differs, how- 

 ever, in the less distinctly toothed antero-lateral margins of the 

 carapace, in the form of the front, which is entire, not notched, and 

 in the disposition of the granules of the chelipedes, both from P. 

 semilanatus and P. seminudvs. 



Pilmnnus Icevimamis, Danat, is apparently allied to this and the 

 foregoing species, but has the carapace almost whoUy naked, and 

 the larger hand rounded above and quite smooth, with only some 

 faint traces of mirnite tubercles toward the base. It has been re- 

 corded from Borneo and New Caledonia. ' 



In Pilumnws nitidus, A. M. -Edwards J, from New Caledonia, 

 which is another nearly aUied species, the two anterior teeth of the 

 antero-lateral margins of the carapace are obsolete. 



^ 69. Pilmnnus cursor ? 



P Pilumnus cursor, A. M.-Edwards, Nouv. Archw. Mils. Hist. Nat. 

 vs.. p. 244, pi. ix. fig. 4 (1873). 



In the specimen I thus very doubtfuUy designate the cara- 

 pace is nearly smooth, with the anterior portion moderately de- 

 flexed, antero-lateral margins much shorter than the postero- 

 lateral, which are nearly straight and convergent posteriorly ; both 

 carapace and limbs are scantily clothed with very short hairs, 

 among which a few longer hairs are interspersed ; the frontal lobes 

 are divided by a rather deep and wide median fissure ; the antero- 

 lateral margins are armed with three spines, besides a smaller but 

 distinct spine at the exterior angle of the orbit. The basal antennal 



* Proc. Linn. Soo. N. S. Wales, vi. p. 544 (1881) ; Catalogue, p. 70 (1882). 

 t Crust. U.S. Expl. Exp. xiii. p. 237, pi. xiii. fig. 11 (1852). 

 X HouT. Arch. Mus. ix. p. 249, pi. i. fig. 2 (1873). 



