JAPANESE ASTEKOIDEA. 307 



of these rows is distinct, and the rest of the surface of the plate 

 is covered with spines, which are subequal to one another. On 

 the abactinal side of the lateral spine, close to its base there are 

 usually three short, squamiform spines, and still further 

 abactinally there are some granules and ciliary spinelets similar 

 to those of the abactinal paxillse. At and near the interbrachial 

 angle the inferomarginals mostly bear on the abactinal side, each 

 a valvate pedicellaria simillar to those of the marginal paxillae ; 

 occasionally there may be two on a plate. Along the margin of 

 the inferomarginal plate is a series of very small spinelets. The 

 fasciolar grooves are covered in the outer part with capillary 

 spinelets. On some plates, especially near the base of the arms, 

 there may be near the inner end of the plate i a forficiform pedicel- 

 laria similar in shape to those of the adambulacral plates. So 

 far I have not found any in the outer part. 



Adambulacrals. — The adambulacral plates are coincident with 

 the inferomarginals and with the ventrolaterals separating the two 

 series and presents a wedge-shaped edge towards the ambulacral 

 furrow. The armatm'e consists typically of three spines and a 

 forficiform pedicellaria (PI. VI, figs. 92, 93). The first spine is 

 laterally compressed, curved, and sword-shaped, and is attached 

 to the plate close to its inner edge, and therefore lies well in 

 the furrow (PI. VI, fig. d3a). The second spine is also lightly 

 curved, but is much more stout and is somewhat triangular in 

 cross-section (PI. VI, fig. 936). Then follow the third spine and 

 pedicellaria, the two in a line parallel to the furrow, and the 

 pedicellaria always on the adcentral side of the spine. Occasionally 

 the pedicellaria may be found between the third and second 

 spines. The third spine is slightly flattened and stout, and a 



