212 



ECHINODERMS OF THE JUilTLSH I8LE8 



1. Amphiura Chiajei Forbes. (Figs. 117, 120, 1, 2.) 



Disk covered with fine scales on both dorsal and ventral sides ; 

 those of the dorsal side diminishing gradually in size towards the 

 edge of disk. Primary plates generally distinct ; radial shields 

 Avholly separated. Dorsal plates of arms rather fan-shaped, with 

 fairly sharp outer corners. Ventral plates hexagonal, with outer 

 edge slightly excavated ; the proximal ones have a more or less 



Fig. 120. — 1-2. Amphiura Chiajei; part of oral side (1) and dorsal side (2). 

 3-5. Amphiura fiUJormis ; part of oral side (3) and dorsal side (4) ; 

 arm spines (5). All figures x 8. (From Danmark's Fauna.) 



distinct keel along the side edges ; 4-6 short, conical arm spines, 

 not hooked or widened at the point. Two broad, scale-Uke 

 tentacle scales set nearly at a right angle to each other. Mouth 

 shields rhombic ; adoral plates meeting within, in larger speci- 

 mens with a longitudinal keel. Outer mouth papilla broad, 

 scale-like. Colour in life reddish or greyish -brown, often some- 

 what mottled. Reaches a size of ca. 10-11 mm. diameter of disk. 

 Length of arms ca. 8 times the diameter of disk. 



Development unknown, but it seems fairly certain that it 

 has a typical Ophiopluteus larva. Perhaps Ophiopluteus dubius 

 (Fig. 87, 4) may belong to this species ; or perhaps the larva 



