15S THE VOYAGE OF H.M.S. CHALLENGER. 



2. First pinnule less than twice as long as the second. 



a. Syzygial interval two joints ; later cirrus-joints 



not specially long, . . . .4. etigua, n. sp. 



/?. Syzygial interval one joint; later cirrus-joints 



elongated, . . . . .5. alteniata, n. sp. 



b. Cirrus-joints not specially elongated. 



1. Lower joints of genital pinnules not expanded; cirrus- 



joints not spiny. 



..,,., n ( rosacea, Linck, sp. 



a. Lower arni-ioints triangular, . . . o. < ' ' f 



( petasus, Dub. and Ivor., sp. 



/8. Arm-joints quadrate from the fifteenth, if not 



before, . . . . .7. diibeni, Bohlsche. 



2. Genital pinnules having expanded lower joints; cirrus- 



joints spiny, . . . . .8. lineata, n. sp. 



II. First and second pinnules tolerably equal. 



a. Less than twenty cirrus-joints which are not specially 



elongated; syzygial interval two joints, . . .9. remota, n. sp. 



b. Over twenty cirrus-joints. 



1. Elongated cirrus-joints; lower pinnules very long. 



a. Second pinnule slender like the first ; syzygial 



interval one joint, . . 10. longipinna, n. sp. 



/}. Second pinnule stouter than the first ; syzygial 



interval two joints or more, . . .11. tenuicirra, n. sp. 



2. Cirrus-joints not specially elongated. 



a. Arms smooth; axillaries long, . . .12. Ixvis, n. sp. 



ft. Arms serrate and spiny ; axillaries wide, . 13. hirsuta, n. sp. 

 III. Second pinnule longer than the first. 



a. Cirrus-joints short ; syzygial interval one joint, . .14. angustipinna, n. sp. 



b. Cirrus-joints long; syzygial interval one to five joints, . 15. abyssorum, n. sp. 

 C. Less than twelve cirrus-joints, . . . . . .16. abyssicola, n. sp. 



1. Antedon phalangium, Mull., sp. (PL XXVII. figs. 23-29; PI. XXVIII. figs. 1-3). 



be 

 Specific formula, A.—. 



1841. Aleeto phalangium, Miiller, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, 1841, p. 182. 

 1849. Comatula (Aleeto) phalangium, Miiller, Abhandl. d. k. Akad. d. Wiss. Berlin, 1849, p. 253. 

 1857. Comatula Woodwardii, Barrett, Ann. and Mag. Nat. Hist., 1857, ser. 2, vol. xix. p. 33, 



pi. vii. fig. 1. 

 1857. Comatula celtica, M'Andrew and Barrett, Ann. and Mag. Nat. Hist., 1857, ser. 2, vol. xx. 



p. 44. 

 1862. Comatula phalangium, Dujardin and Hupe, Hist. Nat. des Zoophytes, fichinodermes, 



Paris, 1862, p. 198. 

 1865. Antedon cellicus, Norman, Ann. and Mag. Nat. Hist., 1865, ser. 3, vol. xv. p. 104. 

 1872. Antedon mediterraneus, Wyville Thomson, Proc. Roy. Soc. Edin., 1872, vol. vii. p. 765. 

 1872. Antedon celticus, Wyville Thomson, Ibid., p. 765. 

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



vol. ii. p. 29. 

 1879. Antedon celtica, P. H. Carpenter, Ibid., p. 29, pL iv. figs. 1-8. 



