315 



257 



Fig. 126. Paraphronima gracilis Claus (after Bovallius, 1889). 



virgate segments. Pereopods III-VI have a long narrow 2nd segment 

 and long 5th-6th segments. Pereopods VII are shorter and somewhat 

 narrower than the preceding ones but in general similar to them. 



The pleon is shorter than the pereon by about the length of the 

 first three somites of the pereon; somite I of the pleon is lower and 

 slightly longer than the other two. The urosome is shorter than the 

 pleon; urosomite I is equal in length to the last (geminate) urosomite. 

 The basipodites of all the uropods are approximately equal in length or 

 that of uropods III is slightly shorter; the width of the basipodites notice- 

 ably increases from pair I to pair III so that the ratio of length to width 

 of the basipodite pair I is approximately 7 : 1, in pair II, 4 : 1, and in 

 pair III, 3:1. The rami of all uropods are considerably shorter than the 

 basipodites. The exopodite of uropods I is narrow and shorter than the 

 endopodite. the exopodite of pair II is slightly shorter but distinctly nar- 

 rower than the endopodite, which, in turn, is approximately two times 

 narrower than the basipodite. The rami of uropods III are very short, 

 proximally broad, their maximum width slightly less than the length. 

 The telson is almost three times narrower at the base than the distal 

 margin of the last urosomite. 



