COPEPOD CRUSTACEANS — LEWIS 



163 



setules. Female and male maxilla as originally described except lo- 

 bate process on middle of second segment a folded membrane. Female 

 maxilliped similar to that of male except with single tuberciilate 

 projection from middle of inner margin of first segment, not with 2 

 as in male. 



Female and male sternal furca (fig. 61c) attached to ventral sm-face 

 of cephalothorax between pair of small, lobate, anteriorly directed 

 projections. Additional pair of somewhat larger lobate projections 

 present between interpodal plates of first and second thoracic legs. 

 First thoracic leg with distinct break in plumosities along inner sur- 

 face of first segment of exopodite ; both inner spines on distal surface of 

 second segment of exopodite with flexible accessory processes, not 

 just middle spine as originally indicated. Exopodite of third thoracic 

 legs 3-segmented, not 2 as originally noted, protopodite with plumose 

 setule at base of exopodite. Endopodite of third legs includes lobate 

 projection previously indicated as arising between rami. For nature 

 of armature and thoracic legs, see figures 61d, e and table 22 in present 

 pubHcation, figures 3a-/ in Lewis, 1964a, 



Caligus ligatus Lewis 



Figures 62-64 

 Caligus ligatus Lewis, 1964a, p. 164, figs. 8-9. 



Distribution and hosts. — Hawaiian Islands, Acanthurus dussu- 

 mieri, Naso hexacanthus. 



Material. — Five females and 2 males (USNM 112933) from the 

 gill cavity and buccal cavity of Dascyllus albisella Gill, from the 

 Honolulu Aquarium. One male (retained by author) from the buccal 

 cavity of Aulostomus chinensis (Linnaeus), captured in fishtrap by 

 Samuel Kaolulo between Diamond Head and Koko Head, Oahu, 

 Hawaii. One male (retained by author) from the gill cavity of 



