184 " THETIS " SCIENTIFIC RESULTS. 



Ambulatory legs stoutish, the second pair a little longer than 

 the first owing to the greater length of the merus and tarsus. 

 Meral joints compressed, one-third as deep as long ; surfaces and 

 upper borders more or less scaly-denticulate ; the lower borders 

 armed with subspiniform granules. 



Carpal joints about O'l mm. longer than the depth of the 

 meral, very narrow proximally, rounded and smooth below, with 

 four denticulated ridges above, and a blunt tubercle at the distal 

 extremity. 



Propodal joints equal or longer than the tarsal, a little com- 

 pressed distally ; lower borders remotely dentate and setose ; 

 lateral surfaces scaly ; upper borders closely denticulate. 



Tarsal joints compressed, laterally caniculate in the basal half, 

 each armed on the lower border with ten or twelve horny spinules^ 

 including the slightly curved claw at the extremity. 



Fourth pair of legs moderately slender, about 3-5 mm. long ; 

 meral joints equal to propodal and tarsal joints combined ; upper 

 borders smooth, lower slightly granular and hairy : posterior 

 surface with an irregular row of setiferous scales, some of which 

 are half cup-shaped ; superior distal edges prominent and fringed 

 with long hairs. Carpal and propodal joints more or less beset 

 with distant elevated scales, subtended by tufts of setse. 



Rasp consisting of a single row of about fourteen scales ; its 

 length is nearly twice that of the short acute tarsus. 



Fifth pair of legs subdorsal, slender. 3-7 mm. long ; each coxal 

 joint has a tubular prolongation, directed inwards and downwards, 

 and their apical margins are fringed with long sette ; propodal joint 

 as long as the carpus, densely clothed with longish curved setse ; 

 rasp longer than broad ; tarsus short, thick, with numerous rasp- 

 like teeth at the blunt extremity. 



Abdomen short, broad and membranous ; the anterior segments 

 are indistinct ; the terga are narrow, short and barely distin- 

 guishable ; pleopoda not seen, probably absent or very rudimentary. 



Sixth segment calcified, with a median longitudinal gi'oove, and 

 another one arranged transversely. 



Uropods equal, strongly calcified; outer ramus 1-1 mm. long 

 and 0'6 mm. wide ; rasp oval, with six rows of scales , inner 

 ramus 0-7 mm. long and 0*4 mm. wide ; I'asp with five rows of 

 scales. 



Telson longer than broad, with a slight transverse ridge ; 

 lateral margins and the rounded extremity with a thick raised 

 border. 



