HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 229 



ment. Genital segment expanded from anterior junction of fourth 

 thoracic leg-bearing segment to widest point in anterior medial region 

 of segment; lateral margins sharply curved, tapered posteriorly. 

 Posterior and posterior lateral areas with double margin; posterior 

 margin convex dorsally, abdomen joined to median portion; ventral 

 margin tapered to region of fusion of genital segment, abdomen, and 

 caudal rami. "Brown body" (Heider, 1879, for Lernanthropus) pres- 

 ent at opening to spermatophore duct located on ventral posterior 

 lateral surface of genital segment; circular, varying from brownish 

 red to bright red in alcohol. Abdomen one-segjnented, of a general 

 ovoid shape; greatest length twice that of fourth thoracic leg-bearing 

 segment, posterior end broadly rounded (fig. 22c). 



Egg strings long, uniseriate, coiled inside brood pouch, each string 

 consisting of more than 300 eggs. Eggs "fanned" by vertical move- 

 ments of single posterior dorsal plate in living, ovigerous specimens 

 (fig. 23^). 



Antennule seven-segmented, attached to swelling on anterior ventral 

 surface of cephalon. Segments of irregular shape and size, appendage 

 tapered irregularly from large proximal to small distal regions. 

 Second segment with three naked setae on anterior margin; third 

 with one; fourth with minute naked seta on posterior margin; fifth 

 segment with two naked setae on anterior distal margin and one on 

 posterior margin; sixth segment with one long and one short naked 

 seta on anterior distal margin; seventh segment with one long, three 

 short naked setae from distal margin, two minute naked setae from 

 posterior margin (fig. 236). 



Second antenna two-segmented, attached posterior to antennule- 

 bearing swelling, on anterior ventral surface of head. First segment 

 strongly developed, curving medially, distal end at right angle to 

 proximal and directly over inner proximal corner. No distinct 

 articular surfaces visible on proximal end of first segment, segment 

 firmly attached to cephalon along entire proximal surface indicating 

 little movement. Second segment short, with strongly developed 

 terminal process. Terminal process of second segment curving 

 strongly inwards, triangular in cross section, inner surface flat (fig. 

 23c). 



Mandible appears four-parted. First part with broad proximal 

 end, irregularly tapered to narrower junction of second part. Second 

 part short, less than one-third length of first part, tapered evenly but 

 abruptly to junction of third part, indicated b}^ slight indentation on 

 outer surface. Third part approximately twice length of second, 

 slender, with little taper. Fourth part slightly longer than first, 

 bent slightly but abruptly in proximal region, distal portion straight, 



