CRTI.STACEA MALACOSTRACA. II. 



67 



(fig. 6 a), not fully three times as long as deep, tapering much from somewhat from the base to the 

 end; second joint slightly longer than the depth of the first and considerably produced above; upper 

 margin of third joint only half as long as that of the second; fourth joint scarcely as long as the 

 upper margin of the second. — Antennae with fifth joint almost half as long again as the fourth, 

 which is slightly longer than the sixth. 



Chelipeds (fig. 6 b) extremely robust. Carpus a little more than half as long again as deep, 

 with the major distal part considerably expanded downwards and the corresponding part of the lower 

 margin much longer than the proximal portion, considerably convex and with some low, rounded 

 saw-teeth along its proximal part, viz. that situated beyond the usual seta. Chela as long as the 

 carpus, less than twice as long as broad; the distal part of the hand somewhat expanded anteriorh- 

 and the corresponding part of the anterior margin very convex and furnished with about six rounded 

 saw-teeth, but without any protruding angle above the insertion of the movable finger. Both fingers 

 thick ; the movable finger somewhat shorter than the anterior margin of the hand, with a row of con- 

 spicuous, rounded saw-teeth along the major part of the proximal half of the anterior margin; the 

 fixed finger with an oblong, low, subtriangular thickening at the usual setse on the outer side, and 

 the posterior margin of this thickening has a row of four strong, rounded saw-teeth; the incisive 

 margin of this finger with three very conspicuous, obtuse, moderately low teeth. 



Second and third pairs of thoracic legs (fig. 6c) quite similar, rather slender; posterior distal 

 spine of fourth joint even longer than fifth joint; sixth joint about one-third as long again as the 

 fifth and a little longer than seventh with claw. Three posterior pairs of legs (fig. 6d) have the 

 seventh joint somewhat shorter than the sixth and adorned with a close row of extremely small seti- 

 form denticles. 



The five anterior abdominal segments (fig. 6e) with the median row of ventral protuberances 

 rounded and somewhat low, seemingly not strongly chitinized. Pleopods with the marginal setse more 

 than twice as long as the rami. Terminal segment with the sides evenly rounded. — Uropods about 

 as long as the .sixth plus half of the fifth abdominal segment (fig. 6e); the peduncle more than twice 

 as long as deep and more than half as long as the first joint of the endopod; first joint of the endopod 

 slightly longer than the second; exopod half as long as the first joint of the endopod. 



Length of the single full-grown or nearly full-grown female without mar^upium 3.5™"'. 



Remarks. This species is easily distinguished by having carpus and chela of the chelipeds 

 proportionately broader than in any other species of this subdivision and besides by the peculiar shape 

 of the chela with the rounded teeth at the posterior margin. — It may be added that the other spec- 

 imen, which is so >oung, that seventh pair of thoracic legs are still wanting, has the carpus and the 

 hand of the chelae less expanded but showing all the characteristic crenulations. 



Occurrence. Taken by the ''lugolf at a single station. 



East of Iceland: St. 4: Lat. 64=07' N., Long. 11° 12' W., 237 fm., temp. 2.5°; 2 spec. 



9* 



