220 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



projectiou heavily chitmized, articulating with small concavity on 

 inner proximal surface of second segment. Second segment with 

 terminal process slightly shorter than first segment, including proximal 

 extension of first segment. Second segment tapered slightly to blunt 

 distal end, tipped by long, slightly curved, dactyliform process with 

 small-pointed protrusion from tip of process. Terminal process of 

 late encysted form sheathed with membranous structure covered 

 with minute, toothlike denticulations; recently excysted specimen 

 also with sheathed process but denticulations replaced by minute 

 tubercles. Distal end of segment, just proximal to base of terminal 

 process, with two accessory processes on anterior margin: first a short, 

 sharply tipped process; second membranous, irregularly shaped 

 process surrounded by tuft of setules (figs. 20r,s). 



Maxilliped of early encysted form two-segmented, attached poste- 

 rior to base of maxilla. First segment in younger specimen narrower 

 in proximal than in distal regions, distal region overlapping proximal 

 region giving two-parted appearance to segment. Second segment 

 of younger specimen short, less than one-f om'th length of first segment ; 

 segment and terminal process continuous, terminal process flaccid, 

 forming slender projection of segment. First segment of older early 

 encysted specimen similar to that of younger but distal portion larger, 

 greatly swollen, with adhesion pad on inner distal sm*face. Second 

 segment of older specimen similar to that of younger though terminal 

 process short but distinct clawlike process fitting into adhesion pad 

 of first segment. Second segment of older specimen with accessory, 

 spinelike process from inner surface just proximal to base of terminal 

 process. Division between terminal process and segment in older 

 specunen distinct (figs. 21a, b). 



Maxilliped of late encysted and recently excysted specimens similar 

 in general appearance to that of older early encysted specimen. 

 Adhesion pad on inner distal surface of fu'st segment with additional, 

 loioblike process extending from distal margin. Second segment 

 more strongly developed, heavily chitinized at articulation with first 

 segment, with two accessory processes instead of one found in older 

 early encysted specimen; terminal process not clawlike but rounded 

 protuberance similar to that of adhesion pad of first segment and 

 abutting with this process when second segment flexed (figs. 21c,d). 



First thoracic leg of early encysted specimens biramous, both rami 

 dactyliform, without external evidence of segmentation. Both 

 protopodite and rami flaccid. Exopodite extending beyond distal 

 margin of endopodite, with three spines in younger specimen, one from 

 outer distal lateral surface, two from distal margin; four spines on 

 older specimen, three as in younger specimen, from distal margin, 

 fourth from inner distal lateral surface. Endopodite with three 



