32 MR. E. J. MIERS ON CRUSTACEA FROM [Jail. 14, 



Stimpson's specimens of P. hirsutus were collected in the North- 

 China sea and near Ousima Island. 



PiLUMNUS DEHAANII, Sp. n. 



The carapace is broader than long, convex, and everywhere covered 

 with a close velvety pubescence, so that no traces of the regions are 

 visible. Antero-lateral margins shorter than the postero-lateral, and 

 armed with three small spines (excluding that of the outer orbital 

 margin, which is not at all prominent). The orbital margins and the 

 front (seen in a dorsal view) are minutely denticulated. In an an- 

 terior view the frontal margin is sinuated, with a median notch. 

 The anterior legs are short, robust, the right slightly the larger ; the 

 arm trigonous and very short ; the wrist with a few conical acute 

 granules on its anterior and upper surface ; the palm smooth on its 

 inner, and armed on its upper and all its outer surface with nu- 

 merous, crowded, unequal, conical, acute tubercles ; fingers acute, 

 meeting when closed, the upper granulous at base. The ambula- 

 tory legs are slightly compressed and hairy. Length 3j lines, 

 breadth 4^ lines. 



The single specimen, a female, was found within the shell of a 

 species of Balanus collected iu the Gulf of Yedo. 



This species, on account of the closely pubescent carapace and 

 form of the hands, has more of the aspect of an Actumnus than of 

 Pilumnus, but differs in the acute fingers and spiniform antero-lateral 

 teeth from that genus. 



I cannot refer it to any of the numerous published descriptions. 

 It is readily distinguished by the nearly equal and closely tubercu- 

 lated hands, the tubercles extending halfway along the mobile finger 

 and covering the outer surface of the hand to the apex of the im- 

 mobile finger. The fingers are nearly colourless. From the P. ac- 

 tumnoides of M. A. Milne-Edwards from New Caledonia (Nouv. 

 Arch. Mus. H. N. ix. p. 247, pi. x. fig. 3, 1873), to which it bears 

 some resemblance, it is at once distinguished by the fewer lateral 

 marginal teeth, &c. 



It has also some affinity with the Pilumnus setiger and P. squa- 

 mosus of De Haan, which have been referred by M. A. Milne- 

 Edwards, rightly I believe, to Actumnus. From the former it difi'ers 

 in the regions of the carapace being obliterated, and from the latter 

 in the conical (not squamiform) tubercles of the hands, which are 

 not seriately disposed ; from both, probably, in the spiniform mar- 

 ginal teeth. 



portunid^. 



Thalamita sima. 



Thalamita sima, Milne-Edw. Hist. Nat. Crust, i. p. 460 (1834); 

 Stimpson, Proc. Ac. Nat. Sci. Phil. p. 39 (1858); A. M.-Edw. 

 Arch. Mus. Hist. Nat. x. p. 359 (1861). 



Portunus {Thalamita) arcuatiis, De Haan, Faun. Japon., Crust, 

 pp. 10, 43, pi. ii. fig. 2, pi. xiii. fig. 1 (1835). 



A female example was collected of this species, which seems to 



