146 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



40/) arising from ventral cephalothoracic surface well posterior to 

 mouth cone, both members of appendage pair fused along proximal 

 half of inner surfaces of first segment. Maxilla (?) 2-segmented, first 

 segment well developed, broader proximally than distally; second 

 segment small, fused with heavily sclerotized, clawlike terminal 

 process. Maxilliped (?) (fig. 40^) situated posterior to maxilla, 2- 

 segmented. First segment well developed, fused with opposing mem- 

 ber of pair along proximal half of inner surface, with heavily sclerotized 

 projection at inner lateral surface that receives tip of heavily scle- 

 rotized, clawlike terminal process of second segment when segment 

 flexed. Second segment small, poorly sclerotized except for inner 

 siuface, separable from terminal process only by difference in 

 sclerotization. 



Remarks. — A question mark is used, in the designation of the 

 Hawaiian specmiens, because of some differences that exist between 

 the original description of P. vaissierei and the Hawaiian specimens 

 and because of the inability to definitely assign the specimen from 

 the original description. The primary characteristic used in asso- 

 ciating the Hawaiian specimens with P. vaissierei is the nature of 

 the lobes of the cephalothorax and, in particular, the posterior median 

 lobe that overhangs the anterior end of the neck. The genital seg- 

 ment is somewhat shorter in the Hawaiian specimens but the an- 

 nulations in the anterior region and the flaccid natiu"e of the segment 

 suggest that both the shape and size may be variable. The egg 

 strings of the Hawaiian specimens are somewhat longer than those 

 figured by Delamare-Deboutteville and Nunes-Ruivo (1953a) al- 

 though this characteristic is presumably also variable. It is unfor- 

 tunate that the single male listed in the specimens of the original 

 collection was not figured and described. 



Paeon jerox Wilson (1919), differs from the Hawaiian specimens 

 primarily in the nature of the cephalothorax, P. jerox possessing 

 a single, large knob with several sets of protruberances on the anterior 

 ventral surface while the cephalothorax of the Hawaiian specimens 

 has several sets of large lobes. P. elongatus Wilson (1932), differs 

 from the Hawaiian specimens not only in the nature of the cephalo- 

 thorax, which is similar to that of P. jerox, but also in the relatively 

 thicker neck, more compact trunk and shorter caudal filaments. 

 P. versicolor Wilson (1919) differs from the Hawaiian specimen in 

 having a much shorter, heart-shaped genital segment, a thicker and 

 annulated neck and a broad, laterally ovoid cephalothorax with 

 heavily sclerotized knobs on the anterior surface. 



