70 ASTEROIDEA, 
peculiarly modified spines; interbrachial spaces closely beset with 
pedicellaria-like scales. Marginals confined to the sides of the 
arms; tho dorsal paxillar area free of pores on the disk and along 
the middle of the arms. Anus present or absent. The adambu- 
lacrals form a series of angles which project into the ambulacral 
groove, and bear spines on either side. No epiproctal cone. 
1. Bathybiaster vexillifer. 
Archaster vexillifer, Wyv. Thoms. Depths of the Sea, (1878) p. 150, 
fig. 25. 
Astropecten vexillifer, Viguier, Arch. Zool. ea ss vii. (1878) p. 240. 
Bathybiaster vexillifer, Sladen, Chall. Rep, Ast. (1889) p. 2438 
Bell, P. Z, 8. 1891, p. 228, pls. xxiii. & xxiv. 
R= 5? 
Arms and disk flat; the former with deep vertical sides formed 
by the marginals, of which there are about 70 in each row ; those 
of the superomarginal series have each a single short spine near the 
upper edge, and the inferomarginal similar and subequal spines near 
the upper and lower edges. ‘The adambulacral spines are arranged 
by fours on two sides of a triangular plate, the apex of which bears 
a spine. Connected with this spine is a grooved spiniform body or 
“‘vexillum,” the edges of which are finely denticulated. A small 
anal orifice. Madreporite small, near margin of disk. 
a. Faeroe Channel, 344 fms. ‘Poreupine ’ Exp. (St. 76). 
Unique specimen. 
LUIDIIN AE (see p. 21). 
LUIDIA. 
Luidia, Forbes, Mem. Wern. Soc. viii. (1839) p. 123; M. Tr. Syst. 
Ast, (1842) p. 77; Norm, Ann. § Mag. xv. (1865) p. 117; A. Ag. 
Mem. Mus. C. Z.v. (1877) p. 117; Veg. Arch. Zool. expér. vii. (1878) 
p. 228; Sladen, Chall. rae Ast, (1889) p. 244. 
Hemicnemis, MW. Tr. Ber. Ak. Berl. 1840, p. 104. 
Petalaster, Gray, Ann. § Mag. vi. (1840) p. 183. 
A Luidiine with elongated, flattened rays, frequently more than 
five in number, and exhibiting a marked tendency to break off with 
great power of repair. 
Key to the Species. 
Seven OrMeht Pays 6 ccs .in ss hat ee ene eee 1. L. eiliaris. 
FIVE DAYS 64 a5. Ske SA ee Wk Oe 64 AOI 2. L. sarsi. 
1. Luidia ciliaris. 
Asterias rubens, Johnston (non Linn.), Loudon’s Mag. Nat. Hist. ix. 
(1836) p. 144, fig. 20. 
Asterias ciliaris, Philippi, Arch. f. Nat. iii. (1887) p. 194. 
