102 THE VOYAGE OF H.M.S. CHALLENGER. 



spinose and pubescent. The merus is smooth and trigonal, two small spinules are present 

 at the distal end of ite superior margin, separated by a transverse groove, and a few 

 minute tubercles are present on the lower and internal margin, in line with a series of 

 short spinules on the corresponding part of the ischium ; the carpus is less than half the 

 length of the propodus and remarkably deficient below, so that the hand can be folded 

 under the merus, its upper surfticc bears three conical spines on the inner margin, with 

 others of smaller size situated externally to these ; the propodus is rather more pubescent 

 than the carpus, and bears five curved acute spines on its inner margin, the spines on the 

 upper surface are of small size, and towards the outer rounded border become replaced by 

 granules, the outer surface is smooth ; the fingers are less than half the total length of the 

 propodus, and each is provided with a black horny terminal plate ; their external surfaces 

 are tubercular and pubescent, and each is provided with from two to three ill-defined 

 pearly teeth. The ambulatory limbs are of moderate length and slightly pubescent, the 

 anterior border of the carpal and propodal joints bears a row of curved acute spines 

 (nearly obsolete on the carpus of the second pair), the dactyli are almost straight, and 

 more densely clothed with hairs than the preceding joints, each terminating in a curved 

 brownish claw. The last two pairs of thoracic legs are smooth and subchelate ; in each case 

 the propodus bears at its distal end the oval punctate area seen in this position in most 

 Pagurids ; the dactylus of the last pair is of very small size. 



The abdominal segments are all distinct, and their posterior margins are fringed with 

 extremely short hairs. The sixth segment is more strongly calcified than the others, its 

 length and Ijreadth are subequal, and a deep fissure is present on each lateral margin, while 

 a shallow median groove traverses its upper surface ; the telson is oblong and its distal 

 end is bilobed, with the margins fringed by long hairs, and a transverse line present near 

 the apex, placed at right angles to an obscure median carina. The appendages of the 

 sixth segment have a firmly calcified protopodite, the posterior margin of which bears a 

 single spine. The ova are moderately large in size. 



Length of the largest specimen (a female with ova) 26 mm., of carapace 8 mm., of 

 chelipede 14 mm., of third right leg 18 mm., of ocular peduncle 4 "5 mm. The largest 

 male measures only 18 "5 mm. in length. 



This species is distinguished from Pylocheles agassizii, A. Milne-Edwards, by the 

 spiny armature of its chelipedes and ambulatory limbs ; in the latter species the chelae 

 are simply granulated, and the ambulatory limbs are smooth. 



Habitat. — Station 163a, ofi" Twofold Bay, Australia; depth, 150 fathoms; bottom, 

 green mud. Several specimens of both sexes, including two females with ova. 



