ASTEROIDEA 81 



Key to the species of Ceramaster known from or likely to occur 

 in the British seas. 



1. Marginal plates wholly covered with granules, at most some of 



the outer upper marginals with a naked part ... 2 

 Both upper and lower marginals with a naked part 



1. C. granular is (O.F.^luW.) 



2. Pedicellarije wholly wanting . C. placenta (:\Iiill. and Trosch.) 

 Pedicellariae present .....•• 3 



3. A conspicuous series of pedicellariae along each side of the ambu- 



lacral furrows C. Vincenti (Perrier) 



No conspicuous series of pedicellariae along the ambulacral furrow 



but some scattered ones on the dorsal plates 



2. C. balteatus (Sladen) 

 Insufficiently known species . . . . C. Greeni (Bell) 



1. Ceramaster granularis (0. F. Mliller). (Fig. 44.) 



(Syn. Goniaster, Pentagonaster, Tosia granularis; Astrogonium 

 granulare (O. F. Miill.) ; Astrogonium boreale Barrett ; 

 Pentagonaster Deplasi Perrier.) 



Body pentagonal, arms very short. Marginal plates, both 

 upper and lower, with a naked area near the edge, larger in the 

 younger than in the adult specimens. Adambulacral plates with 

 4 or 3 furrow spines and outside these some short club-shaped 



Fig. 44. — Ceramaster granularis, from the dorsal and the oral side. 

 Nat. size. (From DanmarFs Fauna.) 



spines, two nearer the furrow spines, and some other, less regu- 

 larly arranged, outer ones, forming the transition to the grains 

 of the interradial plates. Pedicellariae may occur on the dorsal 

 paxillee (Fig. 26, 3), but are often wanting. R= l'3-l-4 r. Colour 

 bright red, lighter on the oral side. Reaches a size of ca. 80 mm. 

 diameter. 



Development unknown, but the large, yolky eggs indicate that 



G 



