HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 169 



segment and terminal process more elongate than in male, more weakly 

 developed. Accessory process from inner distal margin of segment as 

 in male; division between segment and terminal process distinct 

 (fig. 80). 



Sternal furca of male and immature female situated between, and 

 slightly posterior to, bases of maxillipeds. Bifurcation extending 

 slightly less than half total length of structure. Tines of furca curving 

 outwards proximally, slightly inwards distally. Distal end of tines 

 bluntly rounded. Base of sternal furca attached to small, butterfly- 

 shaped plate (fig. 8p). 



First thoracic leg biramous though endopodite reduced to small 

 protuberance on inner surface at junction of protopodite and exopodite. 

 Single segment of protopodite slightly less than three-fourths length 

 of first segment of exopodite, outer proximal margin with slight pro- 

 trusion serving as articular surface, remaining proximal sm'face slightly 

 concave, heavily chitinized. Protopodite with short, plumose seta on 

 inner proximal surface and longer plumose seta from outer distal 

 corner. First segment of two-segmented exopodite with spinule and 

 protruding knob on outer distal corner. Greatest length of second 

 segment slightly less than half that of first; distal surface with three 

 spines and naked seta, outermost spine simple, longer than inner two, 

 bifid-tipped spines; inner lateral margin with three plumose setae 

 (fig. 9a). 



Second thoracic leg biramous. Protopodite two-segmented; fii'st 

 segment short, second segment broad, width slightly greater than 

 length, with small spine on outer distal corner. Exopodite three- 

 segmented; first segment slightly longer than combined lengths of 

 second and third, with spinule projecting from outer distal corner at 

 base of large, well-developed spine curving inward across surface of 

 second segment. Second segment short, about half length of third 

 segment, with large spine projecting from outer distal corner across 

 surface of third segment. Distal margin of third segment convex; 

 third segment with single spine with membrane along both margins, 

 third segment spine, with spinule present at base, on distal lateral 

 surface. Endopodite three-segmented, first segment with single, small 

 spine on distal outer surf ace ; second segment equal to combined lengths 

 of first and third segments, with row of stift" setules along outer lateral 

 margin. Third segment short, lateral and distal margins continuous 

 (fig. 96). 



Third thoracic leg biramous. Protopodite broadly flattened, with 

 cluster of small denticulations on outer surface. Exopodite two- 

 segmented; first segment with two-parted, spinelike process from 

 junction of exopodite and protopodite, distal half of spinelike process 

 curving inwards. First segment of exopodite longer than second 



679-677—64 3 



