JAPANESE ASTEROIDEA 335 



Ventrolaterals. — The ventrolaterals are very nnmerous, poly- 

 gonal in shape, and covered with coarse elongated granules, 

 appearing like paxillae. The plates next the adambulacrals are 

 mostly square and bear each some ten granules. They extend 

 into the arms as far as the twelfth inferomarginals. There are 

 no pedicellaria3 on the ventrolateral plates. 



Paxillce. — The paxillas are comparatively large and closely set, 

 the granules coarse. Those in the interradial depressions are 

 smaller than those on the radial elevations and near the centre 

 of the disk. The pedicellaria3 are numerous and many of them 

 are conspicuous by their elongation in the transverse direction 

 (PL XlII, fig. 198, 201). A large paxilla without pedicel- 

 laria may bear as many as twenty peripheral and ten central 

 granules ; the latter are larger and either rounded or polygonal 

 and the former smaller and more or less prismatic (PI. XIII, fig. 

 200). The pedicellarise are of various sizes, and when they are 

 small they are strictly confined to the border of the tabulum, 

 making a series with the peripheral granules (PI. XII f, fig. 199) ; 

 but when larger they variously intrude into the central area 

 and may even extend across its whole breadth (PL XIII, fig. 201). 

 When their transverse elonç^ation is considerable one or both 

 of the two valves show a trace of fusiou somewhere along their 

 length, betraying the formation of a single valve out of more than 

 one. In some cases there are two elongated pedicellariae placed 

 end to end, but preserving their morphological independence. At 

 the middle of the arms there are five rows (longitudinal) of 

 paxillœ, and each paxilla in this region bears some ten periphe- 

 ral and two central granules. In the undenuded specimen the 

 papulae can be seen only here and there. 



