AKTEDON. 59 



I offer, therefore, the following diagnosis with all reserve, as I 

 have not been able to see fully mature specimens of this species. 



Allied to A. plialangium, but distinguished by having the second 

 pinnule smaller than the first. Cirri numerous and long (up to 00 

 mm.), with from 31 to 45 joints, and dimorphic. Axillary with a 

 strong backward projection, which fits in and over a deep incision 

 on the second radial ; the second brachial also has a strong back- 

 ward projection ; the third brachial is a syzygy ; typical number of 

 joints in syzygial interval three. 



Measurements. Both our specimens are a good deal broken ; 

 Carpenter gives diameter of ceutrodorsal as 5 mm., and spread as 

 17 cm. ; length of first pinnule 15 mm., with 30 joints. 



Colour in spirit pale brown. 



Distribution. North Atlantic (east side) and Arctic Oceans (Kara 

 Sea). 25 to 743 fms. 



a. 60° 22' N., 8° 21' W., 327-430 fins. < Triton ' Exp. 



b. ? Faeroe Channel. ' Porcupine ' Exp. 



6. Antedon phalangium. 



Alecto plialangium, J. Mull. Ber. Ah. Berl. 1841, p. 182. 

 Comatula (Alecto) phalangium, id. Abh. Ak. Berl. 1849, p. 253. 

 Comatula woodwardii, Barrett, Ann. 8f Mag. xix. (1857) p. 33. 

 Comatula celtica, M l Andrew 8f Barrett, Ann. Sf May. xx. (1857) 



p. 44. 

 Comatula phalangium, Duj. fy Hupc, Eehin. (1862) p. 198. 

 Antedon celticus, Norman, Ann. fy Mag. xv. (1865) p. 104 ; Wyv. 



Thorns. Proc. Bog. Soc. Ed. vii. (1872) p. 765 ; P. H. Carp. Tr. 



Linn. Soc. Bond. ii. (1879) pi. iv. figs. 1-8. 

 Antedon niediterraneus, Wyv. Thorns. Proc. Boy. Soc. Ed. vii. (1872) 



p. 765. 

 Antedon phalangium, P. H. Carp. Tr. Linn. Soc. Lond. ii. (1879) 



p. 29; Marion, Ann. Sci. Nat. viii. (1879) p. 40, pi. xviii. ; 



Liidwig, Mitih. Zool. Stat. Neapel, ii. (1880) p. 53 ; P. H. Carp. 



Zool. Anz. iv. (1881) p. 521 ; Bell, Proc. Zool. Soc. 1882, p. 534 ; 



P. H. Carp. P Z. S. 1882 (1883), p. 746 ; id. Proc. Roy. Soc. Ed. 



xii. (1884) p. 361 ; id. Trans. Linn. Soc. ii. (188H) p. 476, pi. 57 ; 



id. Chall, Bep. Com. (1888) p. 158, pi. xxvii. figs. 23 -29, pi. xxviii. 



figs. 1-3; Bell, Ann. $ Mag. iv. (1889) p. 433; P. H. Carp. 



Jonrn. Linn. Soc. xxiv. (1891) p. 67. 



A ??. 



c 



Cirri from about thirty- five to fort)'- five in number, with the 

 distal joints shorter than broad, square, or rather longer than 

 broad ; specimens with very long joints found in the Mediterranean, 

 but not known from the- British Seas ; with or without a penulti- 

 mate spine. The cirri vary in length, and may have as many as 

 fifty joints. 



The centrodorsal is large, flattened on its free surface, rounded or 



