SUN- STAB. 225 



knobs. The base of each ray is crossed by a broad 

 band of pure white, both knobs and network. The 

 remainder of the rays is of a pale orange- scarlet, be- 

 coming more truly scarlet in the middle portion ; the 

 network of the same hue, but deeper. Over the entire 

 surface the areas of the net are occupied by series of ovate 

 whitish hollows, from each of which protrudes a minute 

 clear bladder or closed tube, exactly like those we lately 

 saw in the little Starlet. The madreporic plate is seen 

 about midway between the centre and one of the angles, 

 as a tiny cake-shaped white body, grooved exactly like 

 a brain- stone. 



Beneath, the rays are ploughed with a deep groove, 

 in which are two rows of sucker- feet ; towards the tip, 

 however, their place is supplied by long slender pointed 

 tentacular processes. The avenues are bordered by 

 flat knobs, set like the edging-stones of a garden walk, 

 each of which carries five or six spines radiating like 

 a fan, lengthwise. Each set sends off a branch which 

 carries another fan placed transversely, of six to ten 

 spines. Then the white satiny skin sends up at the 

 very edge of the ray short stems, each bearing a group 

 of fifteen to twenty spines, having a tendency to a 

 transverse arrangement, but not in a single row. These 

 form the edges of the rays, seen from above and below. 

 At the bases of the rays beneath, the angle terminates 

 p 



