HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 155 



curved manner from broad proximal to narrow distal surface. Second 

 segment with three flexible processes and long, naked seta on distal 

 surface, three plumose setae on inner lateral margin (fig. 5c). 



Second thoracic leg biramous. Protopodite two-segmented; first 

 segment short, approximately half length of second segment. Second 

 segment broad, with single, naked seta from outer distal corner. 

 Exopodite three-segmented; length of first segment equal to that of 

 second and third combined, with strongly developed spine directed 

 inward, across surface of second segment, from outer distal corner of 

 first segment. Second segment short, with spine similar to that of 

 first segment though smaller; spine arising from outer distal corner 

 and directed inward across surface of third segment. Length of 

 third segment one and a half times that of second; general outline of 

 segment oval. Third segment with two spines, first small, located 

 on outer surface of middle of segment; second spine approximately 

 four times length of first, located just distal to first spine, inner lateral 

 margin plumose. Endopodite three-segmented; first segment short, 

 second segment long, slightly shorter than combined lengths of first 

 and third segments. Third segment short, half length of first seg- 

 ment, distal and lateral margins continuous (fig. 5d). 



Third thoracic leg biramous. Protopodite one-segmented, flattened; 

 length of protopodite approximately one and a half times width. 

 Exopodite two-segmented, length of first segment almost twice that 

 of second, with two-parted, spinelike process curving inward from 

 junction of exopodite and protopodite. Distance between exopodite 

 and endopodite bases slightly less than half width of protopodite. 

 Endopodite two-segmented; first segment irregular, proximal margin 

 indistinct. Second segment irregularly lobate, distal and lateral 

 margins continuous (fig. 5e). 



Fourth thoracic leg uniramous, three-segmented. Length of one- 

 segmented protopodite slightly greater than combined lengths of two 

 segments of exopodite. Inner proximal surface of protopodite 

 projecting as lobate articular process. Protopodite with single, 

 plumose seta from outer surface of distal end. First segment of 

 exopodite less than three-fourths length of second segment, with 

 elongate spine from outer distal surface. Second segment of ex- 

 opodite with three simple spines from distal surface, each with frilled 

 membrane around inner portion of base; friUed membrane attached 

 to segment, not to spine. Inner spine longest, outer two spines 

 successively shorter. Outermost spine with fine membrane along 

 outer surface (fig. 5f). 



