COPEPODA FROM IFALUK ATOLL 47 



(Brady's 1872a paper, which, as Stock showed, must have been pub- 

 lished after his 1872 paper). It seems to be indicated, therefore, 

 that we use the name Macrocheiron Brady, 1872. 



The three species referable to the genus can be separated with the 

 following key: 



1. Endopodite of leg 4, 1-segmented . . M. cheliferum (Thompson and A. Scott) 

 Endopodite of leg 4, 2-segmented 2 



2. 3rd exopodal segment of leg 4 with 3 spines along external margin. 



M. mutatum Stock 

 3rd exopodal segment of leg 4 with 2 spines along external margin. 



M. fucicolum Brady 



Macrocheiron fucicolum Brady, 1872 



Macrocheiron fucicolum. Brady, 1872, text on pi. 3; 1872a, p. 434, pi. 18 (figs. 9-18). 

 ? Macrocheiron fucicolum. — Vatova, 1928, p. 179. — Marine Biological Association, 



1931, p. 171.— C. B. Wilson, 1932, p. 349, fig. 209.— Gallingani, 1952, p. 75; 



Marine Biological Association, 1957, p. 176. 

 Macrochiron fucicolum. — Brady, 1872, p. 9, pi. 3 (figs. 9-18). — Stock, 1957, 



pp. 379, 380, figs. 1-10.— Stock and de Vos, 1960, p. 206. 

 Macrochiron (Paramacrochiron) fucicola. — Sewell, 1949, pp. 94, 95, 99, 108, 152, 



156, 158, 185, 186, 187. 

 Lichomolgus fucicolus. — Brady, 1880a, p. 41, pi. 85 (figs. 1-11); 1902, p. 55. — T. 



Scott, 1912, p. 571, pi. 12 (figs. 22-26). 

 ILichomolgus fucicolus. — Brady and Robertson, 1873, p. 140; 1876, p. 197. — 



Thompson, 1889, p. 189; 1893, p. 207, pi. 25 (fig. 1).— T. Scott, 1894a, pp. 233, 



258.— Thompson, 1897, p. 98.— T. Scott, 1901, p. 252; 1905a, tab. 2.— Conseil 



I'exploration mer, 1906, p. 75.— Pearson, 1906, p. 22.— Sharps, 1910, pp. 408, 



422, fig. 16. 



Macrocheiron mutatum Stock, 1957 



Macrocheiron fucicolum G. O. Sars, 1917, p. 163, pl. 91. 

 Macrochiron mutatum Stock, 1957, pp. 379, 381. 



Macrocheiron cheliferum (Thompson and A. Scott, 1903) 



Figures 11a, 12-14 



Pseudanthessius chelifer Thompson and A. Scott, 1903, p. 277, pl. 14 (figs. 12- 



18).— Steuer, 1940a, p. 20.— Tanaka, 1960, p. 77. 

 Macrocheiron chelifer. — Gurney, 1927, p. 469, fig. 114. 

 Lichomolgus (Macrochiron) chelifer. — Monod and Dollfus, 1932, p. 139. 

 Macrochiron (Paramacrochiron) chelifer. — Sewell, 1949, pp. 99, 108, 168, 177, 178. 

 Macrochiron cheliferum. — Stock, 1957, pp. 379, 381. 



Material.— Loc. 756, 7 ad. 99, 0.84-0.90 mm. (0.87 mm.), 2 ad. 

 cfcf, 0.77 and 0.90 mm. 



Description. — The following is based on a female specimen of 

 0.87 mm. length and a male of 0.90 mm. length. Both have been 

 dissected and the appendages mounted on slides. 



Adult female, total length 0.87 mm.; greatest diameter 0.35 mm.; 

 length of longest f ureal seta 0.23 mm. 



