HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 175 



greater than that of distal end of third part. Fourth part curved 

 inward, distal end broadly rounded, inner margin with 11 blunt, 

 toothlike denticulations (fig. 10/). 



Postantennal process simple, blunt-tipped, spinehke process pro- 

 jecting posteriorly in slight curve from attachment lateral and slightly 

 posterior to base of second antenna. Proximal surface broad, taper- 

 ing sharply in middle of process to inward curving distal region. 

 Proximal region with two nodules, each with two minute setules; 

 additional nodule present medial to middle of process, projecting 

 slightly from ventral surface of cephalothorax, bearing two minute 

 setules (fig. 10^). 



Postoral process simple, spinelike, projecting posteriorly from 

 attachment lateral and slightly posterior to base of mouth cone. 

 Outer lateral margin irregularly concave, inner lateral margin straight. 

 Single nodule present anterior to base of process, bearing three setule- 

 like projections (fig. lOh). 



Maxilla two-segmented, attached just lateral to base of postoral 

 process. Cephalothorax, in region of attachment of maxilla, with 

 several small, heavily chitinized, spinelike processes (fig. lOi). First 

 segment with slender projection from inner proximal surface serving 

 as articular surface. Distal lateral margins angling sharply inward 

 to sHghtly projecting articular surface. Second segment elongate, 

 length slightly greater than greatest length of first segment; proximal 

 surface tapered, inner portion irregular, forming articular surface. 

 Second segment with sharply pointed spine on distal region of inner 

 margin, two flexible spines projecting from distal surface of segment. 

 Inner terminal spine almost twice length of outer, fringed by fine 

 membrane along both margins; outer spine with fine, setuliferous mem- 

 brane along both margins (fig. IQ;). 



Maxilliped two-segmented, situated posterior and medial to first 

 maxillipeds. First segment obovoid, with strong projection of prox- 

 imal surface forming articular surface. Middle of inner lateral margin 

 of first segment with small, convex process. Distal surface concave, 

 forming region of attachment and articulation of second segment; 

 distal lateral surface with small, heavily chitinized, knoblike projec- 

 tion. Second segment slender, slightly wider proximally than dis- 

 tally; with small concavity on inner proximal margin, fitting over 

 shght projection of distal lateral surface of fu"st segment when second 

 segment flexed. Second segment with short, inward-curving terminal 

 process and two small, spinelike accessory processes, both on inner 

 surface of distal region of segment. Both accessory processes sur- 

 rounded by fine, frilled membrane. Division between terminal process 

 and segment distinct (fig. lOA:). 



