I IATHBUN— MARINE BRACHYURA 229 



152. Pilumnus hirsutus Stimpson. 



Pilumnus hirsutus Stimpson, Smithson. Misc. Coll., xlix. 1907, p. 69, pi. 9, fig. 1. 



Providence, 29 f'rns., Sta. D 3; 1 ?: 50 — 78 fins., Sta. D 4; 15 specimens, 1 with 

 Rhizocephalid parasite. Amirante, 39 f'ms., Sta. E 16 ; 1 $: 20 — 44 fms., Sta. E 25; 1 $. 



The species to which I give the name P. hirsidus has a strong resemblance to 

 P. andersoni. In P. andersoni, the front is almost bare in front of the transverse fringe 

 of long hair, so that the outline of its oblique lobes is plainly visible ; in P. hirsutus, the 

 long fine hairs which cover the greater part of the dorsal front obscure the margin, the 

 lobes of. which are less oblique. The immovable finger of the large chela is longer in 

 hirsutus. 



The $ from station E 25 is possibly not conspecific with the others; it is only 2'9 mm. 

 long and has a breadth of 4 '4 mm., being much distorted from a Bopyrid parasite in each 

 branchial chamber. 



153. Pilumnus orbitospinis, sp. nov. (Plate 16, figs. 14, 15). 

 Salomon Bank, 60—120 fms.; 2 ? (1 ovig.). 



$ ovigerous, C. 1. 8'1 mm., C. b. 10 '7 mm. 



Carapace subrotund, covered, as are chelipeds and legs, with short pubescence, and 

 long, soft yellow hairs ; surface smooth, regions scarcely indicated. Antero-lateral margins 

 armed with 3 long and slightly curved spines, besides a shorter spine at the orbital angle. 

 Posterolateral margins markedly convergent. Front with a V-shaped emargination of 

 good size, lobes slightly convex, outer angle a small triangular tooth. Orbital notches 

 indistinct ; upper margin granulous, lower margin spinulous ; at the inner angle but 

 separated from the antenna, a long slender spine pointing forward and slightly inward. 



Chelipeds unequal, covered with spines and spinules ; 2 long curved spines near end 

 of upper margin of arm ; strong spines on wrists, smaller palm and upper half of larger 

 palm ; on the lower half of the latter the spines are reduced to sharp granules and dis- 

 appear near the lower and distal margins. The spinules extend at least half way down 

 the fingers of the small claw and about ^ the upper surface of the large dactylus. Fingers 

 brown, the colour not reaching the proximal end. Legs long and slender. 



This species has much the appearance of P. maldivensis Borradaile (Fauna Maldive 

 Arch., i. 1902, p. 247, text-fig. 47) but the hairs are longer, the lateral spines not lobiform 

 at base, the larger hand stouter than in fig. 47 b, the smaller hand with thumb deflexed. 

 Characteristic of this species is the long spine of the inner orbit visible from above and the 

 pair of long spines on the upper arm. 



154. Pilumnus tahitensis de Man. 



Pilumnus tahitensis de Man, Notes Leyden Mus., xii. 1890, p. 61, pi. 3, figs. 4, 

 A a, ib. 



Saya de Malha, 29 fms., Sta. C 19; 1 $. C. 1. 8'4 mm., C. b. 10"8 mm. 



155. Pilumnus tceniola Rathbun. 



Pilumnus tceniola Rathbun, 1906, p. 864, pi. 11, fig. 3, text-fig. 24. 



