368 s. GOTO : 



Tlic testa is very hard, especially on the oral side, where the 

 ventrolateral plates are thoronghly ankyloscd with one another. 

 The disk is large and the interbrachial angles are only a little 

 greater than a right angle. 



Sitperomarcjinals. — The superomarginals are comparatively 

 large and low, and are covered with small polygonal grannies, 

 which are only very slightly larger in the onter part of the plates. 

 The number of the superomarginal plates is given in the fore- 

 going table. 



Infer omarginals. — The inferomarginals are low hke the supero- 

 marginals but broader and slightly more projecting and form 

 the lateral margin of the body. They are contingent with the 

 superomarginals through the greater part of the arms, but near 

 the tip the two series become slightly alternate. The inferomar- 

 ginals are covered with small granules similar to those of the 

 superomarginals for about two-thirds of their breadth, but are 

 replaced in the outer one-third by flattened spines, which are 

 longer in the interbrachial angles and become shorter and more 

 squamiform as they go farther towards the tip of the arms. 

 Even in the interbrachial angles these spines are not very long 

 and are not so very conspicuous as in many species of Astropec- 

 ten (PI. VIII, fig. 133). 



Adamhulacral plates. — The adambulacral plates are rather 

 narrow, and there are about nine of them for every seven of the 

 inferomarginal plates. The first adambulacral plate is about twice 

 as broad as long, but from the sixth or seventh on they are 

 about as broad as long ; and the inner edge of each plate, except 

 the first few, is wedge-shaped (PI. VIII, fig. 130). Along this 

 edge there is a curved row of ambulacral spines of some length. 



