STARFISHES OF THE PHILIPPINE SEAS. 519 



Thickly scattered among the spinelets are relatively large, forcipi- 

 form pedicellariae with very slender jaws. In B. anchista the pedi- 

 cellariae are minute. 



Eays very long, swollen beyond the base by the gonads. Promi- 

 nent costae 25 to 30 confined to basal fifth of ray, beyond which 

 for an equal distance are about 15 very inconspicuous ridges com- 

 posed of small plates, but carrying a fairly heavy felting of pedi- 

 cellariae. The prominent costae are in the form of narrow, elevated, 

 irregular ridges, bearing comparatively coarse spinelets, 2 or 3 to a 

 plate. No intercostal felted bands of pedicellariae until beyond the 

 region of prominent costae, where the bands occur at regular inter- 

 vals but are not particularly prominent. Dorsal integument very 

 thin. No integumentary prickles. About 5 closely joined lateral 

 (or marginal) plates at base of ray, beyond which on the first promi- 

 nent lateral plate is a tiny sharp, decidious lateral spine, which in- 

 creases rapidly in length until at the outer end of the costal region 

 it is about 12 mm. long or 5.5 times the length of an adambulacral 

 plate. The lateral spines are opposite every other adambulacral 

 plate and proximally their plate forms the base of a costal arch. 

 There is also a costal arch between every 2 lateral spines, but these 

 have no prominent marginal plates, as do the alternate arches. 



Adambulacral plates crowded ; near the disk viewed from the side, 

 their height equals 1.5 their length, and width actinall}^ equals 1.25 

 times length measured in the middle, or about the length measured 

 on furrow margin. Opposite the last prominent costae the dimen- 

 sions are relatively nearly the same and it is not until the middle of 

 ray that the length begins to exceed the width. The typical formula 



for costal region is . . Sometimes the formula seems to be 



ii + 1 



—3 — , because the minor aboral spinule (1) moves furrow ward and 



stands close to the true furrow spinelet but even then is usually 

 directed at an angle from the latter. The aboral furrow spinelet is 

 about 1.25 the length of the plate, the minor aboral actinal spinule 

 varying from slightly more to slightly less than the above. The 

 large actinal spine equals 3 plates in length and the adoral actinal 



spine 2. On the outer attenuate part of ray the formula is — ^~, the 



adoral actinal spinelet having moved fairly into the furrow. On 

 some the large spine stands exactly in the middle, the formula then 



being -. +1. The spines are all fluted and richly provided with pedi- 

 cellariae, which also occur on the surface of the plate. 



Mouth plates with the following armature: a furrow spine at either 

 end of the furrow margin about equal in length to width of com- 



