JAPANESE ASTEEOIDEA. 467 



is larger than tliat between any two lopliial tubercles, and on 

 either side of about the middle of this space lies a tubercle about 

 half as large as the first lophial tubercle, similar to the latter in 

 shape and armed with a terminal spine. The reticulum formed 

 by the ossicles of the abactinal side is tolerably distinct on the 

 surface, and two longitudinal series of them can usually be made 

 out on each side of the arms, the inner of which lies in line with 

 the accessory tubercle between the adcentral and the first lophial 

 tubercles. When the surface granules are removed a third series 

 can be seen extending into the arms about one -third the whole 

 length. The ossicles themselves are covered over with rounded 

 «rranules, but the meshes between them with rounded or short, 

 conico-cylindrical granules, between which lie the papular pores, 

 of which there are many in a single mesh. On the margin of 

 these pores and between the granules above mentioned there are 

 numerous, minute, short spines. The last form of the armature 

 of the abactinal side is the pedicellarios, which are all of one form, 

 and are similar to those of the abactinal side of 0. nodosus, being 

 forcipiform and nearly equal to them in size (PI. XVI, fig. 243). 



Madreporlti'. — The madreporite is tolerably large and lies just 

 outside the pentagon formed by the adcentral tubercles. It is 

 ovate in form with the broader side turned towards the centre, 

 and is covered with irre<2;ular radiatinij furrows. 



Termincd plat:\ — The terminal plate is relatively small, and is 

 covered over with granules exactly similar to those of the su- 

 peromarginal plates. 



Zocrt/%— Naha, Okinawa Island. Collected by Dr. M. Mtyajima, 

 Mav 22, 1900. The colour is m-evish white in alcohol. Littoral. 



Specimen in S.C. 



