JAPANESE ASTEROIDEA. 



355 



being broad and extending far into the arms. The interradial 

 areas on the abactinal side are depressed. 



Radial ratio. — The radial ratios are only slightly different 

 for the two specimens : 



Superomarcjinals. — These do not appear conspicuous on sur- 

 face view, owing to the fact that their granulations and the 

 coronal spinelets of the paxillsG bordering on them are similar in 

 form ; but the marginal plates are very well developed. Their 

 number is given in the foregoing table. The superomarginal 

 plates are uniformly covered with coarse granulations of a conico- 

 pyramidal form and rather well spaced. The fasciolar grooves are 

 rather narrow and entirely naked. So far I have not found any 

 pedicellarise on the superomarginals. No difference worth noting 

 can be detected between the granulations along the margin of 

 the plate and its general surface, except that the former are a 

 shade longer and more pointed. 



Inferomarginah.— The inferomarginals are generally coincident 

 with the superomarginals and are similar to them in form. The 

 granulations are also mostly similar to those of the superomar- 

 ginals, except that those nearer the inner margin assume more a 

 pyramidal shape and form a transition to the armature of the 

 ventrolateral plates. It is also to be noted that there are a few 

 bivalvate pedicellariae, similar to those found on the paxilloo, on 

 the inferomarginals of the whole body. Their positions, which 



