ASTERIAS. 99 
Stellonia webbiana, D'Orbigny in Webb § Berthelot, Hist. Nat. 
Canar. ii. (1839), Mollusques, &e. p. 148, pl. ii. figs. 8-13. 
Asteracanthion webbianus, Daj. § Hup. Echin. (1862) p. 340. 
Asterias madeirensis, Stimpson, Proc. Bost. Soc. Nat. Hist. viii. 
(1862) p. 263. 
Marthasterias foliacea, Jullien, Bull. Soc. Zool. Fr. iii. (1878) p. 141. 
Asterias (Stolasterias) glacialis, Sladen, Chall. Rep. Ast. (1889) 
. 088. 
Stellonia glacialis, Forbes, Mem. Wern. Soe. viii. (1839) p. 125. 
Disk rather small, well defined ; arms long, with sharp contours 
and rather long spines, arranged in regular rows, the number of 
which varies considerably. Ambulacra very wide, taper very 
gradually ; spinulation monacanthid, the spines pretty stout, and 
blunt at their free ends; on either side a double row of short, 
rather sharp spines, All the remaining spines on the arms are set 
on rounded disks formed of an elevation of the integument and 
crowded with papule. ‘These spines may be arranged in one median 
with a lateral row along the outer dorsal margin on either side, and 
the intermediate spaces almost altogether bare of even isolated 
spines. There is every intermediate stage between this and the 
presence of five regular subequal rows on the arms. ‘The spines 
vary somewhat, but they are always pretty long and rather stout ; 
the free end is blunt and may be coarsely ribbed. Madreporite 
rather obscure, not large. Pedicellarie not very numerous. 
Colour light yellow to white. 
This species may attain to considerable dimensions :— 
Breadth of arm Depth of arm 
Ray-length. Radius of disk. at base. at base. Spines. 
+0 5 9:5 9 ee 
66 14 16 6 0:4:3 
92 13 16°5 i) 3:2 
100 10 15 9 2 
160 Wi 21 14 2:3 
200 24 36 =e ) 
230 20 42 <S 647 
Distribution. Eastern side of North Atlantic from Iceland to 
Cape Verde; Arctic Ocean ; Mediterranean. 0-66 fms. 
a, b, Kilbrennan Sound. John Murray, Fsq. 
c. Between island of Sanda and Ailsa Craig. John Murray, Esq. 
d. Scotland. Duke of Argyll. 
e. Berehaven. tev. W.S. Green. 
tf. g. Lough Hyne. 
h, t. Galway. Earl of Enniskillen. 
j, & Kenmare River. 
l-o. Belfast Bay. 3elfast Nat. Hist. Soc. 
p-s. Off Liverpool. 
t. Ilfracombe. Rey. Coper Abbs. 
wu. West of Lundy Island. 
v-y. Falmouth. W. P. Cocks, Esq. 
z-c’. Plymouth Sound. Dr. Leach. 
H 2 
