ANTEDON. 



53 



Key to the Species. 



a. Most proximal pinnules long and whip-like, made 

 up of many short joints. 



i. With numerous long cirri \. A. eschrichti. 



jS. Proximal pinnules short, made up of few short 

 joints. 



i. With less than 20 joints in cirri j | j[;^«L. 



.. T _ T . , ,. n „ . . , . . 1 4. A. tenella. 



n. \\ ith more than 20 joints in cirri <- ^ vro H m 



iii. With more than 40 joints in cirri 6. A. phalangium. 



1. Antedon eschrichti. 



Alecto eschrichtii, J. Mi'tll. Ber. Ah. Berl. 1841, p. 183 ; id. Arch. f. 



Nat. 1841, p. 142. 

 Comatula (Alecto) eschrichtii, id. Abh. Ah. Berl. 1847 (1849), p. 254. 

 Alecto eschrichtii, Liitk. Vid. Medd. 1857, p. 55. 

 Alecto glacialis, Walker, J. Dubl. Soc. iii. (1862) p. 70. 

 Comatula eschrichtii, Duj. § Hup. Echinod. (1862) p. 199. 

 Antedon eschrichti, Loom, (Efv. Vet.-Ak. Fork. 1866, no. 9, p. 230, 



figs, i, m ; Verrill, Proc. Bast. Soc. N. H. x. (1866) p. 343 ; Wyv. 



Thorns. Proc. Roy. Soc. Ed. vii. (1872) p. 764 ; Duncan $ Slad. 



Arctic Echin. (1881) p. 73, pi. vi. tigs. 1-4; Bell, P. Z. S. 1882, 



p. 534 ; P. H. Carp. t. c. p. 74o ; id. Proc. Roy. Soc. Ed. xii. 



(1884) pp. 364, 374 ; id. Bijdr. Dierk. xiii. 6 (1886) p. 5, pi. i. 



tigs. 7-10; Levinsen, Dijmphna-Togtets, z.-b. Udbytte, (1887) 



p. 410, pi. xxxv. figs. 7, '8 ; Carpenter, Chall. Rep. Com. (1888) 



p. 138, pi. i. figs. 8 a-d, pi. xxiv. figs. 4-14. 



A- C . 



c 



A large, stout species. 



Cirri very numerous, a hundred or more, and covering nearly all 

 the hemispherical centrodorsal, of considerable length and made up 

 of more than forty, and sometimes nearly sixty joints, none of which 

 bear distinct spines. First radials almost hidden, second more or 

 less incised to receive the large rhombic axillary, the outer sides of 

 which are deeply incurved and leave a piece projecting between the 

 bases of the pair of arms. The arms are strong and long, and may 

 have as many as 300 joints. First brachial has outer edge much 

 deeper than the inner, the distal edge is deeply incurved to receive 

 the backwardly projecting tubercle of the second brachial, the third 

 a syzygy ; the next succeeding joints are triangular, with the 

 longest side alternately inner and outer ; the eighth joint a syzygy ; 

 the successive joints squarer, the twelfth or thirteenth a syzygy, as 

 is every successive third or fourth. 



The most proximal pinnules very long, and the constituent 

 joints numerous and small ; the dorsal surfaces are coarsely serrated 

 near the base and more finely near the free end. The pinnules 

 soon become shorter and have much stouter basal joints. 



Colour in spirit brownish to white ; pale when dry. 



