116 OPHIUROIDEA. 
20th arm-joint. Arm-spines 7-9, very short, and quite insignificant. 
Colour in spirit yellowish white. 
Found by ‘Porcupine’ at St. 45a (51° 1' N., 10° 2' W.), 180 fms. ; 
specimens apparently lost. 
Distribution. North and South Atlantic, N. and S. Pacific (with 
some variations, fide Lyman). 180 to 1825 fms. 
2. OPHIOCNIDA. 
Ophiocnida, Lyman, Ill. Cat. M. C. Z. i. (1865) p. 183; id. Chall. Rep. 
Oph. (1882) p. 152. 
Ophiocoma, Forbes, Brit. Starf. 1840, p. 30 (pars). 
Ophiolepis, M. Tr. Syst. Ast. (1842) p. 89 (pars). 
No tooth-papille ; teeth ; mouth-papille not numerous. Disk 
small, with naked radial shields and fine scales; arms long and 
slender ; arm-spines short, stout and solid. Plates of disk spiny or 
granular. 
1. Ophiocnida brachiata. (Plate XIII. figs. 3-5.) 
Asterias brachiata, Montagu, Trans. Linn. Soc. vii. (1804) p. 84. 
Ophiura brachiata, Leach, Zool. Misc, ii. (1815) p. 57; Flem. Brit. 
An. (1828) p. 488. 
Ophiocoma brachiata, Forbes, Brit. Starf. (1840) p. 45; Thompson, 
Nat. Hist. Irel. iv. (1856) p. 487. 
Ophiolepis (Ophiopholis) brachiata, M. Tr. Syst. Ast. (1842) p. 96. 
Ophiopholis brachiata, Gray, Cat. Brit. Rad. (1848) p. 25. 
Amphiura neapolitana, Sars, Nyt Mag. x. (1859) p. 35 (pl. i. 
figs. 11-15). 
Ophiocnida brachiata, Lyman, Cat. Mus. C. Z. i. (1865) p. 12; 
Ljungman, Eefv. Vet.-Akad. Forh. 1866 (1867), p. 317; Fischer, 
Actes Soc. Bord. xxvii. (1869) p. 362; Ljyungman, Ufo. Vet.-Akad. 
Forh. 1871 (1872), p. 642; Ludwig, Mitth. zool. Stat. Neap. i. 
(1879) p. 550; Lyman, Chall. Rep. Oph. (1882) p. 155; Leslie § 
Herdman, Proc. R. Phys. Soc. vi. (1881) p. 89; Hoyle, op. cit. viii. 
Sipe 145; Carus, Faun. Med. (1884) p. 95. 
Ophiocnida neapolitana, Lyman, Cat. Mus. C. Z. i. (1865) p. 187. 
Amphiura brachiata, Norm. Ann. §& Mag. xv. (1865) p. 109. 
Arms fifteen to twenty times as long as the radius of the disk. 
Disk pentangular ; covering-scales small, closely packed, imbricating, 
with a free edge near the periphery and forming at it spinous 
processes. Radial shields small, triangular. The very long arms 
have about eight flattened short spines; upper arm-plates nearly 
twice as broad as long, lower nearly square; two tentacle-scales at 
base of arm, and one elsewhere. 
R = 110 (about); r = 6:5. 
R = 100 (about); » = 6. 
The arms are often a good deal twisted or curved. 
Colour, dry, various shades of yellow or grey; ‘when alive 
purplish brown and sometimes bluish ash-colour” (Montagu). 
