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PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 





0.2 mm, 



Figure 7. — Caligus randalli, new species (holotype female): a, first thoracic leg; b, second 

 thoracic leg; c, third thoracic leg; d, fourth thoracic leg. 



Third thoracic leg biramous. Protopodite broadly flattened, with 

 cluster of ten distinct, knoblike projections from middle of inner 

 ventral surface and longitudinal row of toothlike projections on 

 outer ventral surface. Exopodite two-segmented, with well-de- 

 veloped, two-parted, bluntly pointed process arising from junction 

 of protopodite and first segment of exopodite and curving inwards 

 distally. Process with membranous margin along inner distal 

 surface. First exopodite segment slightly larger than second, wider 

 distally than proximaUy; second segment rounded. Endopodite 

 three-segmented; first segment short, second and third combined, 

 forming flat, lobate structure; proximal end of second segment nar- 

 rower than distal (fig. 7c). 



Endopodite of third thoracic leg of all specimens of C. constrictus 

 examined from coUections of U.S. National Museum also three- 

 segmented, as in O. randalli. This is contrary to Shiino's statement 

 (1959b) that the endopodite is two-segmented. 



Fourth thoracic leg uniramous, four-segmented. Protopodite 

 equal to combined lengths of tlu-ee segments of exopodite. Outer 

 distal corner of protopodite with small spinule. First two segments 

 of exopodite of approximately equal size, both rounded distally, 

 tipped with well-developed, slightly curved spine with membranous, 

 slightly frilled margin along outer and inner margins of spines. Spine 



