ASTERJAS. 99 



Stellonia webbiana, IfOrbigny in Webb $■ Bertkelot, Hist. JSat. 



Canar. ii. (1839), MoUusqws, &c. p. 148, pi. ii. figs. 8-13. 

 Asteracanthion webbianus, Duj. 8f Hup. Echin. (1862) p. 340. 

 Asterias niadeirensis, Stimpson, Proc. Bost. Soc. Nat. Hist. viii. 



(1862) p. 263. 

 Marthasterias foliacea, Jullien, Bull. Soc. Zool.Fr.ui. (1878) p. 141. 

 Asterias (Stolasterias) glacialis, Sladen, Chall. Rep. Ast. (1889) 



p. 588. 

 Stellonia glacialis, Forbes, Mem. Wern. Soc. viii. (1839) p. 123. 



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 papulae. 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. Pedicellariye not very numerous. 



Colour light yellow to white. 



This species may attain to considerable dimensions : — 



Distribution. Eastern side of ]Sorth Atlantic from Iceland to 



Cape Verde ; Arctic Ocean ; Mediterranean. 0-66 fms. 



a, b. Kilbrennan Sound. John Murray, Esq. 



c. Between island of Sanda and Ailsa Craig. John Murray, Esq. 



d. Scotland. Duke of Argyll. 



e. Berehaven. Bev. W. S. Green. 

 /, g. Lough Hyne. 



h, i. Gal way. Earl of Enniskillen. 

 j, k. Kenmare Elver. 



' l-o. Belfast Bay. Belfast Nat. Hist, Soc. 

 p-s. Off Liverpool. 



t. Ilfracombe. Rev. Coper Abbs. 



u. "West of Lundy Island. 



v-y. Falmouth. W. P. Cocks, Esq. 



z-c'. Plymouth Sound. Dr. Leach. 



h2 



