212 THE VOYAGE OF H.M.S. CHALLENGER. 



b. Centro-dorsal more rounded ; the cirri without definite arrange- 

 ment. 



1. Thirty to forty cirrus-joints; the radial axillaries long; 



lower joints of the genital pinnules expanded, . . duplex, Carpenter, MS. 1 



2. About fifty cirrus-joints ; the radial axillaries short and 



wide, . . . . . . .3. lusitanica, n. sp. 1 



B. Fifteen to twenty-five stout and usually smooth cirrus-joints. 



I. Centro-dorsal shortly columnar or conical, with five double rows of 

 cirrus-sockets. 

 a. First radials visible; the arm-bases smooth and rounded, . 4. flexilis, n. sp. 1 



h. First radials entirely concealed ; the lower arm-joints have raised 



distal edges, . . . . . . -5. patula, n. sp. 



II. Cirri without definite arrangement. 



a. The distichals and lower brachials have distinctly flattened sides. 



The later cirrus-joints smooth. 



1. Calyx and arm-bases almost smooth; lower joints of the 



genital pinnules not specially distinguished, . . 6. robusta, n. sp. 



2. Calyx and arm-bases irregularly tubercular. 



a. The pinnules from the tenth to twentieth brachials 



have the third to fifth joints flattened and expanded 



laterally, ..... pourtalhi, Carpenter, MS. 



/3. The genital pinnules comparatively slender, with 



very slightly expanded joints, . . . brevipinna, Pourtales. 1 



b. The distichals and lower brachials are but slightly flattened 



laterally ; blunt spines on the later cirrus-joints, . . 7. compressa, n. sp. 



1. Antedon macronema, Mull., sp. (PI. IV. figs. 3, a-d; PI. XXXVIII. figs. 4, 5). 



Specific formula — A. 2.—. 



1846. Comatula macronema, Miiller, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, 1846, 



p. 179. 

 1849. Comatula macronema, Miiller, Abhandl. d. k. Akad. d. Wiss. Berlin, Jahrg. 1847 



[1849], p. 258. 

 1862. Comatula macronema, Dujardin and HupcS, Hist. Nat. des Zoophytes, Echinodermes, 



Paris, 1862, p. 203. 



1879. Antedon macrocnema, P. H. Carpenter, Trans. Linn. Soc. Lond. (Zool.), ser. 2, 1879, 



vol. ii. p. 29. 



1880. Antedon macrocnema, P. H. Carpenter, Journ. Linn. Soc. Lond. (Zool.), 1880, vol. xv. 



p. 213, pi. xii. figs. 25, a-c. 

 1882. Antedon macronema, Bell, Proc. Zool. Soc. Lond., 1882, p. 534. 

 1882. Antedon macronema, P. H. Carpenter, Ibid., p. 746. 

 1885. Antedon macronema (misprinted mauonema), Bell, Proc. Linn. Soc. N.S.W., 1884 



[1885], vol. ix. p. 497. 



Centro-dorsal a thick disk or short column with a smooth dorsal pole and about 

 twenty-five to thirty-five cirri on its sides. These are very slender and reach 45 mm. in 

 length, the longest having nearly one hundred joints, most of which are wider than long. 



1 Some individuals of these species have only ten arms ; see p. 54. 



