317 



is rounder and relatively smaller than in females. Antennae I are similar 

 to those of the preceding species. Antennae II in females are equal to 

 antennae I in length. 



Somites I-IV of the pereon are almost identical in size; 

 somites V-VII are somewhat longer. Somite VII is the longest. The legs 

 are better developed than in P. gracilis and have a slightly broadened 

 2nd segment. Coxal plates II-V are free in females. The 2nd segment 

 259 of pereopods I is longer than the rest together, its length three times 

 its width, and the margins slightly convex; the 4th segment forms in 

 the posterior distal part a spoon-shaped projection armed with spiniform 

 setae; the 5th segment is twice longer than wide, its anterior margin 

 convex and the posterior margin straight; the segment broadens distally 

 and its projecting posterior distal angle bears spines; the 6th segment 

 is narrow, equal to or slightly shorter than the 5th, and when bent may 

 form with it a weak subchela; the claw is small and thickened at the 

 base. Pereopods II are barely longer and narrower than pereopods I; the 

 2nd segment is narrow, four times longer than wide, and approximately 

 equal in length to the rest of the leg; the 6th segment is narrower and 

 longer than the 5th segment; the claw has a triangular lobe at the base, 

 comparable to it in size and denticulation of the margin facing the claw. 

 Pereopods III-IV are identical; the 2nd segment is somewhat shorter than 

 the next three segments together; the 5th segment is 3.5 times longer than 

 wide; the 6th segment is narrower and shorter than the 5th segment; the 

 claw is small. Pereopods V-VII are also identical; the 2nd segment is 

 approximately three times longer than wide; the rest of the segments are 

 of the same proportions as those of the preceding pairs. Pereopods VII, if 

 shorter than pereopods VI, only slightly so; the 2nd segment is somewhat 

 longer than the analogical segment of pair VI, with a straight or slightly 

 concave anterior and barely convex posterior margin; it is equal to or 

 somewhat shorther than the rest of the leg. 



The pleon and urosome together are equal to the pereon in length. 

 The somites of the pleon are higher than those of the pereon and project 

 downward more; the large bases of the pleopods impart more massive- 

 ness to the pleon. The urosomites are approximately equal in length. The 

 basipodites of the uropods are equal in length, but the width increases 

 from pair I to III; the ratio of length to width in pair I is approxi- 

 mately 4 : 1, in pair II, 2.5 : 1, and in pair III, 2:1. The exopodite 

 of uropods I is spiniform and about 1/3 shorter than the lanceolate 

 endopodite, whose length is more than half that of the basipodite. The 

 exopodite of uropods II is narrowly lanceolate, about half as narrow and 

 slightly shorter than the broad endopodite, whose length is also more 

 than half that of the basipodite. The rami of uropods III are equal in 



