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PROCEEDINGS OF THE NATIONAL MUSEUM 



Figure 5. — Caligus flextspina, new species (holotype female, allotype male): a, female 

 maxilliped; b, male maxilliped; c, first thoracic leg; d, second thoracic leg; e, third thoracic 

 leg; /, fourth thoracic leg. 



surface of second segment at junction of segment and terminal process. 

 Division between segment and terminal process distinct. Terminal 

 process and accessory process giving chelate appearance to segment 

 (fig- 5a). 



Maxilliped of male similar to that of female though more strongly 

 developed. First segment with irregular inner margin; small, flat 

 protrusion present on inner margin that receives distal end of terminal 

 process of second segment when segment flexed (fig. 56). 



Sternal furca of female and male situated between, and slightly 

 posterior to, bases of maxillipeds. Tines of furca rounded, curved 

 slightly inwards at distal end. Greatest distance between tines equal 

 to greatest width of base of furca. Bifurcation extending half total 

 length of furca (fig. 4c). 



First thoracic leg biramous though endopodite reduced to rudiment 

 in adult. Protopodite one-segmented, with plumose seta on inner 

 surface just proximal to middle of segment. Proximal surface without 

 projecting articular surface but with heavily chitinized concavity on 

 outer portion appearing to serve for articulation. First segment of 

 exopodite slightly longer than protopodite, with small, heavily chitin- 

 ized knobs protruding from distal margin as articular surfaces; with 

 single, small spine on outer surface in distal region of segment and 

 row of setules along inner surface. Second and terminal segment of 

 exopodite short, half length of first segment, slender, tapered in 



