138 



PROCEEDINGS OF THE NATIONAL MUSEUM 



between 2 concave, lappet-like projections; tines sharply pointed, 

 essentially parallel (right tine broken on figured female specimen, tines 

 more irregular on second female specimen). 



For nature of legs and armature, see figures 51a-/ and table 18. 



Table 18. — Armature of thoracic legs I-IV of the female and male of Caligus asym- 

 metricus Kabata, 1965b 



Discussion. — The Hawaiian specimens differ from the original 

 description of Caligus asymmetricus Kabata in several respects. The 

 genital segment is more swollen, a characteristic that may be due 

 to maturity. The tines of the sternal furca of the figured specimen 

 are not quite as angular as those figured by Pillai (1963), although the 

 tines on the other female are similar to Pillai's figure. The terminal 

 processes of the exopodite of the first thoracic leg are structurally 

 similar to those figured by Pillai but they are at the end of the seg- 

 ment, not subterminal as Pillai figures them. The denticulations 

 on the outer margin of the second segment of the endopodite of the 

 figured second thoracic legs differ in nmnber (6 instead of 9) but 

 not in character. There is, however, some variation in the number of 

 denticulations in the Hawaiian material, even in the same specimen, 

 the number ranging from 5-14 denticulations. Pillai (1963) based 

 his description on 1 female specimen (nonovigerous?) from a speci- 

 men of Euthynnus affinis along with several specunens of C. kuroshio 

 (=?C. bonito Wilson, 19056), while the Hawaiian material came 

 from a specimen of Euthynnus yaito. 



Caligus pelamydis Kr0yer 



Figures 52, 53 



Caligus pelamydis Kr0yer, 1863, p. 124, pi. 4, fig. 4a-g. — Richiardi, 1880, p. 148. — 

 Valle, 1882, p. 245.— Carus, 1885, p. 357.— Bassett-Smith, 1899, p. 452.— 

 Brian, 1899b, p. 198.— WUson, 1905b, p. 594, pi. 13, figs. 154-161; pi. 14, fig. 

 161a.— Brian, 1906, p. 43.— Brady, 1910, p. 589, fig. 69.— Stebbing, 1910, 



