HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 223 



distal margin. Endopodite of both specimens with three plumose 

 setules from distal margin, one plumose setule from middle of inner 

 margin. Segments of both rami of late encysted forms visible inside 

 rami of early encysted form (figs. 2\k,l). 



Third thoracic leg of late encysted and recently excysted specimens 

 biramous. Protopodite broad, greatest length about three-fourths 

 greatest width, with single plumose seta on inner proximal margin, 

 single plumose setule just outside base of exopodite. Expodite two- 

 segmented; first segment longer than second, narrower proximally 

 than distally, with single spine from outer distal corner. Second 

 segment of exopodite broadly rounded, almost orbicular, lateral and 

 distal margins continuous; with two membrane-margined spines on 

 outer margin. Endopodite two-segmented; first segment shorter 

 than second, flared rapidly from narrow proximal to broad distal 

 surface. Second segment narrower proximally than distally, lateral 

 and distal margins distinct (fig. 21m). 



Fourth thoracic leg of early encysted forms uniramous, two- 

 segmented. Protopodite one-segmented, slightly wider than long; 

 ramus and protopodite flaccid. Ramus with rounded protrusion from 

 distal portion of outer surface, larger in younger than in older speci- 

 men; two minute, pointed projections present on protrusion in younger 

 specimen, three in older. Both exopodite and endopodite of late- 

 encysted specimens visible inside single ramus of early encysted 

 specimens (figs. 2ln,o). 



Fourth thoracic leg of late encysted and recently excysted forms 

 biramous, rami one-segmented. Protopodite longer than wide, outer 

 surface with distinct groove giving bilobed appearance, with single 

 plumose setule lateral to outer margin of exopodite. Exopodite 

 narrower at proximal than at distal end, with three spines on distal 

 portion of outer margin, each with light membranous margin. En- 

 dopodite oblong, with small but distinct indentation of inner margin, 

 indistinct, discontinuous groove visible extending part way across 

 segment from indentation (fig. 2\p). 



j, second thoracic leg of late encysted and recently excysted specimens; k, third thoracic 

 leg of younger early encysted specimen; /, third thoracic leg of older early encysted 

 specimen; m, third thoracic leg of late encysted and recently excysted specimens; n, 

 fourth thoracic leg of younger early encysted specimen; o, fourth thoracic leg of older 

 early encysted specimen; p, fourth thoracic leg of late encysted and recently excysted 

 specimens. 



