HAWAUAN ACANTHURID CALIGOIDS — LEWIS 207 



surface of terminal process. Third segment with single, spinelike 

 accessory process at indistinct junction of terminal process and seg- 

 ment (fig. 17 h). 



Mandible of female and male four-parted. First part with broad 

 base, tapered regularly to slightly narrower distal end; second part 

 short, distinctly tapered to junction of third part. Third part elon- 

 gate, length slightly less than combined lengths of first two parts; 

 fourth part slightly more than half length of third, curving inward, 

 bearing 11 toothlike denticulations on inner margin (fig. 17i). 



Postantennal process of female and male simple, spinelike process 

 attached just lateral, and slightly posterior to, base of second antenna. 

 Spinelike process curved posteriorly, terminating in blunt tip, bear- 

 ing two minute nodules on inner proximal surface, proximal nodule 

 with two long setules, distal with three (fig. 17 j). 



Postoral process of paratype female specimen bifurcate, attached 

 just lateral to base of mouth cone (process broken in holotype). 

 Postoral process of D. curtus simple, spinelike process, not bifurcate 

 as in D. hijurcatus (fig. 17Z). Distance across base of bifurcate 

 process greater than distance between tips, length of tines approxi- 

 mately one-third length of process; single, slight protrusion pres- 

 ent just proximal to apex of bifurcation. Single, lobate process 

 present just anterior to base of spine, with three setules from distal 

 surface (fig. 17k). 



Postoral process of male similar to that of female except with large, 

 finger-like protrusion on inner margin of bifurcate process (fig. 17m). 



Maxilla of female and male two-segmented, attached slightly lat- 

 eral and posterior to postoral process. Proximal segment strongly 

 developed, broader at base than at distal end, with articular process 

 forming extension of inner proximal surface. Distal end of first seg- 

 ment flat. Second segment elongate, greatest length about one and 

 one-fourth times that of first segment ; inner proximal surface irregular, 

 proximal end articulating with flat distal end of first segment. Prox- 

 imal half of second segment slightly swollen, both margins convex, 

 with fine, membranous flap on inner margin. Spine with attached 

 membrane present on middle of inner margin of segment. Second 

 segment terminated by two curved, spinelike processes, inner almost 

 twice length of outer, with fine membrane along inner margin. Outer 

 spinelike process on distal end of second segment with frilled mem- 

 brane along outer margin (fig. 17n). 



Maxilliped of female two-segmented, attached slightly posterior and 

 medial to maxilla. First segment well developed, with long articular 

 process extending from outer proximal portion of segment. Distal 

 margin with several heavily chitinized surfaces serving as articular 

 surfaces for second segment. Second segment short, forming, with 



