HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 145 



one on anterior inner surface, second on posterior inner surface. 

 Division between terminal process and segment distinct (fig. 2e) . 



Mandible four-parted; first part broader proximally than distally. 

 Second part short, one-fourth length of fii'st part, tapered sharply 

 to junction with narrower third part. Third part elongate, with 

 irregularly curved margins. Fourth part curved strongly inwards, 

 outer margin with slight, chitinous thickening; outer margin with thin 

 membrane, inner margin with eleven toothlike denticulations (fig. 2/). 



Postantennal process simple, falciform, acuminate spine attached 

 just lateral to proximal end of first segment of second antenna. Base 

 of process strongly chitinized, ring-shaped; spine continuous with base. 

 Base with two nodules, each with two minute setules. Two additional 

 nodules present, medial to base of process, one from plate medial to 

 anterior end of base, second from ventral surface of cephalothorax 

 medial to posterior end of base (fig. 2g). 



Postoral process simple, spinelike, extending posteriorly and slightly 

 inward from base just lateral and posterior to proximal end of mouth 

 cone. Distal end of process rounded. Large nodule present just 

 anterior to base of process; length of nodule about half length of 

 process; with three setalike projections, one ahnost as long as nodule, 

 second and third short, less than half length of first (fig. 2h). 



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

 process. First segment slightly shorter than second, wider proximally 

 than distally; inner proximal surface protruding slightly as articular 

 surface. Distal end of segment abruptly narrowed, extending as 

 slim, bifurcate process; distal ends of process forming articular surface 

 for second segment, one part of process on each side, second segment 

 resting in crotch of process. Second segment elongate, slightly wider 

 in middle than at either end. Simple, flexible, lobate process present 

 on second segment, projecting from distal half of inner surface. 

 Distal surface of second segment with two elongate spines, inner 

 approximately one and one-third length of outer. Inner spine with 

 thin membrane along both inner and outer margins ; outer spine with 

 frilled membrane along both inner and outer margins (fig. 2^). 



Maxilliped two-segmented, attached medially and slightly posterior 

 to maxilla. Fu'st segment strongly developed, with well-developed, 

 recurved, proximal, articular projection; middle of inner margin with 

 two small, heavily chitinized, tuberculate projections. Distal margin 

 irregular, with several heavily chitinized articular surfaces. Second 

 segment and terminal process falciform; second segment with spine- 

 like accessory process from anterior surface. Terminal process with 

 minute nodule projecting from proximal inner margin; division be- 

 tween terminal process and segment indistinct (fig. 2j). 



