COPEPOD CRUSTACEANS — LEWIS 



169 



processes. Outermost terminal process approximately 1}^ times the 

 length of innermost, with fine membrane along both margins; inner- 

 most with finely serrated membrane along both margins. 



Male maxilliped (fig. 63^) 2-segmented, situated posterior and 

 medial to maxilla base. First segment large, strongly developed, 

 with knoblike projection on distal half of inner surface, distal surface 

 of knob grooved, appearing to receive distal part of terminal process of 

 second segment when segment flexed. Second segment short, tapered 

 from proximal end to indistinct junction with clawlike terminal 

 process, single, setule-hke accessory process present on distal inner 

 surface of segment. Fu'st segment of female maxiUiped (fig. 63/) 

 not as well developed as that of male, without projection of distal 

 inner surface. Second segment and terminal process as in male. 

 Sternal furca situated on median longitudinal axis of body, posterior 

 to maxilliped bases, base of furca long, lobate, tines diverging in 

 curved manner from point of bifurcation, terminating in rounded tips. 



For nature of legs and armature, see figure 64 and table 23. 



Remarks. — The presence of mature females and the variation 

 exhibited in the males in the present collection indicated that a re- 

 description of the species was in order. 



Table 23. — Armature of thoracic legs I-IV of the female and male of 

 Caligus ligatus Lewis, 1964a 



Condition on male, female =D. 



Caligus flexispina Lewis 



Caligus flexispina Lewis, 1964a, p. 149, figs. 4-5. 



Distribution and hosts. — Hawaiian Islands, Acanthurus trio- 

 stegus sandvicensis. 



Material.— One female (retained by author) from the external sur- 

 face of Aulostomus chinensis (Linnaeus), captured in a fishtrap by 

 Samuel Kaolulo between Diamond Head, and Koko Head, Oahu, Ha- 

 waii. One male (retained by author) from the external surface of an 

 unknown labrid captured in the Hawaiian region. 



