LUIDIA. a 
Luidia fragilissima, Morbes, Mem. Wern. Soc. viii. (1839) p, 123, 
ie iii. fig. 8 (pars) ; id. Brit. Starf. (1841) p. 135 (pars); Mait- 
and, Faun. Belg. Sept. (1851) p. 88; Thompson, Nat. Hist, Irel. 
iv. (1856) p. 441. 
Asterias pectinata, Couch, Mag. Nat. Hist. iv. (1840) p. 34. 
Luidia ? ciliaris, Gray, Ann. § Mag. vi. (1840) p. 188. 
Luidia ciliaris, Duy. § Hup. Echin. (1862) p. 433 (pars) ; Perr. Ann. 
Sei. Nat. xii. (1869) p. 300, pl. 18. fig. 17; Pusher, Act, Soe. 
Linn, Bordeaux, xxvii, (1872) p. 363; Perr, Arch. Zool. exper. V. 
(1876) p. 262; Ludw. Mitth. zool. Stat. Neap. i. (1879) p. 544; 
Sladen, Chall, Rep. Ast. (1889) p. 254. 
Asterias imperati, Delle Ch. Descr. An. Sic. cit. iv. (1841) p. 57. 
Luidia savignii, M. Tr. Syst. Ast. (1842) p. 77 (pars); Dib. §& Kor. 
Vet.-Akad. Hdlg. 1844 (1846), p. 254 (pars); Sars, Norg. Ech. 
(1861) p. 26; Norm. Ann. & Mag. xv. (1865) p. 117; Heller, 
Zooph. u. Ech. Adriat. Meer. (1868) p. 55; Scott, Brot Toy. Phys. 
Soc, Edin. 1890-1 (1892), p. 82. 
R = 5 r to 7r (about). 
Rays seven or eight, long, well marked off from the disk, tapering 
very slightly, so that the sides are almost parallel till quite close to 
the end, which is wedge-shaped and very fragile. Ambulacra wide, 
bounded by one row of small delicate, and an outer row of longer 
and stronger spines; in both sets the neighbouring spines are rather 
widely separated from one another. Beyond the adambulacral 
plates is a row of respiratory pores, which are immediately succeeded 
by the inferomarginals, carrying a row of three or four, as well as a 
number of small, but closely packed, rather delicate spines. Paxilla 
of upper surface numerous, regular, stellate above. Madreporite 
small, obscure, near edge of disk. Pedicellariew trivalve, very broad, 
arranged regularly on either side of adambulacral ossicles. 
Colour of spirit-specimens faded yellow to brownish, lighter below, 
sometimes with darker patches; dry, more or less orange, darker 
alongside the arms, below lighter to greyish. 
R.* r. 
220 30 
195 32°5 
180 32°5 
155 22 
134 16 
16 12 
Distribution. Eastern side of Atlantic from Faeroe to Cape Verde ; 
Mediterranean. ‘To 87 fms. 
a. Arran. W. C. Trevelyan, Esq. 
b, c. S.W. coast of Ireland, 55 fms. 
d, Kenmare River. 
e, f. Isle of Man. Prof. E. Forbes. 
* The arms of one and the same specimen, even when uninjured, are not all 
of the same length. 4 
