HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 231 



surface. Proximal end of first segment irregular, outer lateral margin 

 convex, inner straight; inner distal margin irregular, with slight 

 articular surface protruding from segment, articulating with slight 

 concave depression of second segment. Second segment curved 

 inward, middle of outer surface with several small clusters of spinules, 

 distal surface with several spinules and bearing terminal process 

 denticulate along inner and outer margins (fig. 23/). 



Maxilliped two-segmented, attached just posterior and medial to 

 maxilla. First segment strongly developed, proximal end broad, 

 distal narrow, taper primarily on inner surface, outer margin convex. 

 Inner margin irregular, with shelflike formation at proximal end. 

 Distal inner surface of first segment irregular, with two nodelike 

 protrusions, one on posterior surface, second on anterior; protrusions 

 projecting slightly above margin and forming articular surfaces for 

 second segment. Second segment short, heavily chitinized, curved 

 inward; terminal process well developed, spinelike, curved inward. 

 Length of second segment and terminal process approximately two- 

 thirds length of first segment, division between terminal process and 

 segment distinct (fig. 23^). 



The first and second thoracic legs have been described in the dis- 

 cussion of the body and will not be included in the following descrip- 

 tions of the thoracic legs. 



Third thoracic leg biramous, projecting from posterior lateral 

 margin of third thoracic segment; lamellate, segmentation not visible. 

 Endopodite slightly longer than exopodite, exopodite folded along 

 midline, attached to endopodite along proximal margins. Both 

 endopodite and exopodite with elongate, distally rounded extensions 

 from rounded distal margin ; length of extensions almost one-fourth 

 length of appendage (fig. 23h). 



Fourth thoracic leg biramous, attached to lateral posterior surface 

 of fom'th segment, Protopodite large, dactyliform, slightly wider at 

 proximal than at rounded distal end. Exopodite and endopodite 

 minute, one-segmented processes from distal end of protopodite, each 

 tipped by small, spinelike process (fig. 23-^). 



Caudal rami obovate, laminate, greatest length slightly less than 

 two times greatest width; proximal margin indistinct, rami fused to 

 abdomen and posterior surface of genital segment. Outer margin 

 with distinct bulge in proximal portion, pointed distal end tipped by 

 minute, two-parted, spinelike process (fig. 23^'). 



Remarks.^ — The above description represents the first time this 

 species has been described from specimens since Nordmann's original 

 description (1864). Nordmann indicated that A'', expansus was 

 similar to members of the cyclopoid genus Tucca although both 



