C32 • s. GOTO : 



body, are very stout and more or less triangular in shape near 

 the interradial line but square outwards. Each plate bears on 

 the outer border a stout, short conical spine projecting obliquely 

 outwards, so that the sides of the arms are coarsely serrated. 



On the actinal side, the comparatively large inferomarginal 

 plates are most conspicuous. They are nearly square in outline 

 and the last few plates of the arms bear each a short but dis- 

 tinct spine at the disto-external corner of the plate. The infero- 

 marginal plates are throughout coincident with the superomar- 

 ginals. Just external to the adambulacral plates there is a 

 series of square or rectangular plates much smaller than (about 

 one-fourth of) the inferomarginals and extending to the tip of 

 the arms. The triangular space between this row and the infero- 

 marginals is occupied by some roundish or square plates, which 

 are generally speaking arranged in rows parallel to the first 

 mentioned series, and extending into the arm only about one- 

 third of its length. 



The adambulacral plates bear each a furrow series of three 

 or four, rarely five, comparatively thick, short spines arranged 

 in a palmate form, followed by a single stout spine on the 

 actinal face. Previous descriptions lead one to infer that there 

 must be considerable variation in the number and position of the 

 pedicellariae, and in fact, in the specimen now under considera- 

 tion these are present only on a few plates in the whole body, 

 and are borne at the adcentral end of the adambulacral plate, 

 between the furrow series and the actinal spines, which latter 

 form a regular series along the ambulacral furrow. 



The mouth- plates bear on the furrow border each 7-8 spines 

 similar to the furrow spines of the adambulacral plates, and 



