310 



253 



Fig. 124. Cystisoma longipes (Bovallius) 

 (</■, Us— after Bovallius, 1889; Md— after Stephensen, 1918). 



has two denticulate keels that project with acute denticles along the sides 

 of the claw, and is twice longer than wide; the claw is half the length 

 of the 6th segment. The 2nd segment of pereopods II is longer than the 

 re;t of the leg and armed as in pair I; the denticulate process of the 5th 

 segment is longer than its basal part and extends beyond the base of 

 the claw; the 6th segment is four times longer than wide, more coarsely 

 254 denticulate posteriorly than anteriorly, and weakly curved; the claw is 

 half the length of the 6th segment. The 2nd segment of pereopods III is 

 narrow and longer than the 3rd-5th segments together; the 4th segment 

 is shorter than the 5th, the 6th segment equal to it but narrower; all the 

 distal segments are denticulate on the posterior side but the 5th-6th seg- 

 ments have transverse rows of setae on the surface. In pereopods FV the 

 segments are approximately of the same proportions but longer. Pere- 

 opods V-VI are very long, pair V almost as long as the animal itself and 

 pair VI shorter by the length of the last segment. The 2nd segment of 

 pereopods V has denticulate carinate margins, is six-seven times longer 

 than wide, and the anterior margin distally has a denticulate lobe over- 

 hanging the base of the 3rd segment; the total length of the 4th-5th 

 segments is notably more than the length of the 2nd; the 4th segment is 



