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PROCEEDINGS OF THE NATIONAL MUSEUM 



genital segment), upon the change that occurs in the length of the 

 abdomen in other species (e.g., Caligus conjphaenae) , and upon 

 Wilson's statement (1905b, p. 589) that "the joints [arel about equal 

 in immature females" (the 2-segmented condition is not evident in 

 the Hawaiian specimens), the present author feels that the difference 

 in the length of the abdomen between the Hawaiian material and 

 Wilson's original description of C. honito is due to the immature condi- 

 tion of the Hawaiian specimens. 



The differences between the Hawaiian specimens and Caligus 

 kuroshio Shiino, 1959c, are primarily differences in the small armature 

 elements of the appendages. The caudal rami of the Hawaiian 

 specimens possess a small, nodular projection on the inner distal 

 surface that bears a plumose setide while Shiino's figure does not 

 show the nodule. Shiino indicates (table I) that there is a large, 

 plumose seta on the second segment of the protopodite of the second 

 thoracic leg which is not present in the Hawaiian specimens; how- 

 ever, he does not figure this armature element and its presence would 

 make C. kuroshio unique. Shiino describes a 2-segmented condition 

 for the exopodite of the third thoracic leg while the present author 

 describes a 3-segmented condition for the Hawaiian specimens of 

 C. honito. Shiino's "first segment" is what the present author calls 

 segments 1 and 2, The large, inwardly curved spine is at the distal 

 end of the first segment (fig. 48e) while the plumose seta and 

 naked setule (Ih in Shiino's table I) are on the second segment. 

 Shiino also uses the smaller size of his specimens to dift'erentiate C. 

 kuroshio from C. honito. The size of Wilson's holotype female is 

 8.3 mm, the largest specimen in Shiino's 1959c description is 6.92 mm 

 (range 5.39-6.92), Yamaguti (1936a, C. honito) fists 4.5-5.6 mm, 

 Brian (1935, C. honito) fists 8mm, Brian (1924, C. honito) lists 4,5,7 

 and 8 mm females, and a male at 5 mm, Shiino (1960b, C. honito) gives 

 the largest female at 6.7 mm, while the Hawaiian female specimens 

 range from 6.2-6.5 mm. 



