54 CRIJSOIDEA. 



Length of arms 65 (broken) 70 * 



Diameter of disk 8-5 7*5 



Length of 1st pinnule 23*5 13 



„ „ 4th „ 12 



„ „ 8th „ 12 



Greatest length of cirri 46 26 



This species appears to grow to a larger size in more northern 

 latitudes ; thus a specimen from Discovery Bay had arms 200 mm. 

 long, disk 11 mm. wide, the first pinnule was 25 mm. loug, and the 

 greatest length of cirri almost 50 mm. 



Distribution. Both sides of northern parts of North Atlantic and 

 Arctic Ocean, 20-632 fms. 



a 60° 14' X., G° 17' W., 632 fms. ' Porcupine ' Exp. 



160° 22' 40" N., 8° 21' W., 327 fms. ) 

 b \ or to V ' Triton ' Exp. 



60° 31' 15" X., 8° 14' W., 430 fms. j 



2. Antedon bifida. (Plate IX.) 



Antedon rosacea, auctorum nuperorum. 



Asterias bifida, Perm. Brit. Zuol. iv. (1777) p. 55. 



Antedon bifida, Bell, Ann. 8c Mag. iv. (1889) p. 432. 



Asterias decacnemos, Perm. Brit. Zool. iv. (1777) p. 56. 



Asterias pectinata, Adams, Linn. Trans, v. (1800) p. 10. 



Antedon gorgonia, FrSminville, Nouv. Bull. Soc. Philom. ii. (1811) 



p. 349. 

 Alecto euvopaea, Leach, Zool. Misc. ii. (1815) p. 62. 

 Comatula mediterranea, Lamk. An. s. Vert. ii. (1816) p. 535 ; 



Mutter, Phys. Abh. Ale. Berlin, 1847 (1849), p 252; Seller, SB. 



Ak. Wiss. Wien, xlvi. (18(33) i. p. 444 ; Barrois, Cat. Crust. (1882) 



p. 35. 

 Comatula europea, Forbes, Rep. Brit. Assoc. 1850 (1851), p. 211. 

 Comatula europaea, Sars, Nyt Ma;/, x. (1859) p. 16. 

 Comatula rosacea, Flem. Brit. An. (1828) p. 490 ; Blainv. Actinol. 



(1834) p. 248; Forbes, Wern. Mem. viii. (1839) p. 128; id. Brit. 



Star/. (1841) p. 5 ; Thompson, Nat. Hist. Lrel. iv. (1856) p. 436 ; 



Terrier, Arch. Zool. exper. ii. (1873) p. 29. 

 Antedon rosacea t, Norman, Ann. fy Mag. xv. (1865) p. 102 ; Wgv. 



Thomson, Proc. Bog. Soc. Ed. vii. (1872) p. 765 f Lang, Nature, 



xiv. (1877) p. 527; Hughes, Nature, xv. (1877) p. 7; Stebbing, 



t. e. pp. 58, 366 ; Hunt, t. c. p. 59 ; Mason, ibid. ; Carpenter, t. c. 



p. 197 ; id. Tr. Linn. Soc. Lond. ii. (1879) pi. i. fig. 1, pi. iv. 



figs. 12-17; Bendy, Stud. Biol. Lab. Oioens Coll. i. (1886) 



p. 299 ; Herdman, Liverpool M. B. C. Pep. i. (1886) p. 131 ; 



Haddon 8c Bell, Proc. Hog. Tr. Acad. iv. (1886) p. 618 ; Carpenter, 



Cha/l. Pep. Com. (1888) p. 158; Chadwick, Liverpool M. B. C. 



Rep. ii. (1889) p. 48 ; Perrier, Nouv. Arch. Mus. ix. (188(5) p. 53, 



* All measurements, unless otherwise stated, are in millimetres. 

 1" By some written A. rosaceus ; I have not thought it necessary to distinguish 

 them. 



