12 ART. 7. — K. KINOSHITA : ON SOME MUEICEID CORALS 



over the contracted operculum in tlie state of rest. The calyx- 

 spicules are, on the whole, scaly and wider than high ; their free 

 margin is usually rounded and rarely provided with a rounded 

 process ; the inner margin is pointed. The warts, with which 

 the outer surface is densely covered, are round, low, and draAvn 

 out into dentation at the margin. The nucleus is excentrically 

 situated near the base. The size of these scales is not constant, 

 but usually becomes smaller towards the margin of the calyx. The 

 measurements in length and width are as follows: 1.1x0.7, 

 0.8x0.7, 0.7x0.6 mm. (proximal scales); 0.35x0.27, 0.3x0.15 

 mm. (distal scales). 



The operculum, which is composed of the spicules of the 

 tentacles, can be drawn into the calyx, but is always visible 

 through the terminal pore of the calyx, sometimes even in profile 

 view (PI. II., figs. 17, 18). 



On the dorsal side of tentacles there are usually present two 

 spicules, which touch each other with their upper ends, but diverge 

 downwards to terminate usually with a bent end. They are spindle- 

 like or flattened, covered with warts, and are very variable in 

 size. 



Above the spicules just described, are numerous small rods 

 (about 0.1x0.02 mm.) arranged in two or more rows (PL IL, fig. 

 19, c). At the base of the two large opercular spicules on each 

 tentacle, there are further one or more (often five, in one case even 

 seven) spicules, set in close succession parallel to the inner side 

 of the proximal end of the former (PI. IL, fig. 19, a). 



The cœnenchyma spicules, which make up a complete ar- 

 mour, are a little imbricated or lie side by side. They are all typ^ 

 ical scales, usually polygonal with rounded angles and often some- 

 what elongate in shape; the outer surface, which is slightly concave 



