STAKJFISHES OF THE PHILIPPINE SEAS. 325 



low bivalved, similar to those of Oreaster^ lower than the granules 

 and 2 to 2.5 times as long as broad. These occur also on the supero- 

 marginal and actinal plates. The second sort are tong-shaped with 

 spatulate jaws, 2 or 3 times as long as the granules, and occur on the 

 adradial plates and second, adjacent, series. The papulae are well 

 shown in Koehler's figure 2, on plate 7. They extend nearly to the 

 end of the ray and to center of disk, but are segregated more or less 

 into 10 areas by the conspicuous double interradial series and the 

 radial series of plates. All these 10 merge, however, with the circular 

 area in center of disk (inside the circle of primary radial plates). 

 The granules guarding the pores are slightly larger than those of 

 the surface of the plate, but are not at all squamiform. The anal 

 aperture is guarded by about 10 granules much larger than the 

 others. 



Superomarginals, 12, tumid, the last 3 or 4 with a group of 

 enlarged granules in the center. Terminal plate elongate, with a 

 conspicuous blunt conical spine at the tip. The last 4 or 5 inferomar- 

 ginals, as noted by Perrier, have a conspicuously enlarged granule 

 in the form of a robust blunt tubercle near the aboral border of plate 

 on the rounded ventrolateral angle. 



The actinal intermediate plates are clearly outlined and arranged 

 in 3 chevrons, with 2 plates starting a fourth adjacent to the prox- 

 imal inferomarginals. On the interradial line are 3 unpaired plates, 

 the middle much the biggest. Granules, hemispherical to thimble- 

 shaped, spaced one-half to three- fourths their own diameter apart. 



The adambulacral armature conforms to Perrier's description, and 

 is best shown by the figure. There are 6 furrow spines, webbed for 

 half their length, usually 3 subambulacral spines, the median much 

 enlarged, flattened, and subspatulate, and a row of 4 granules on 

 the outer magin. At the adoral end of the subambulacral series, or 

 between it and the outer series of granules, is a forceps or tongs 

 shaped pedicellaria. 



Mouth plates with 9 marginal and 5 to 7 shorter subambulacral 

 spines, back of which are about 7 granules, all these 3 series parallel. 

 In the angle between the second row of granules of the combined 

 plates are upward of 20 granules. 



The specimen from Ganjam, India, referred to above, differs in 

 having 8 or 9 furrow spines, while the first series of subambulacral 

 spines are 4 or 5, graduated in length toward the mesial, which is not 

 conspicuously larger than the others. In addition to 3 or 4 com- 

 pressed granules on the outer edge of the plate there is a second sub- 

 ambulacral series of about 4, somewhat flattened, truncate spines, 

 shorter than the inner series. The abactinal granulation is coarser, 

 and there are no actinal intermediate and abactinal slitlike pedicel- 



13434— Bull. 100—19 22 



