STARFISHES OF THE PHILIPPINE SEAS. 173 



The inferomarginai plates have a strong crest or ridge and en- 

 croach narrowly upon the actinal surface. Their armature is less 

 constant than in Integra and varies from 3 to 6 spines, but is 

 usually either 3 or 4, less commonly 5, rarely 6. Sometimes there 

 are 3 large, spaced spines, increasing in length toward the outer 

 (which equals 2.5 or 3 plates in length) ; sometimes 2 shorter internal 

 spines are followed by a pair of larger, more widely spaced spines; 

 again, 1 or 2 small inner spines are followed by 2 (or 3) larger, 

 the upper end of the plate being occupied by 1 or 2 abruptly smaller 

 spines (4 to 6 in all). On the outer part of the ray there are 

 usually 3 spines, and near the tip 2, only. A number of plates, 

 especially adorally, have 1 or 2 two- jawed pedicellariae near the 

 middle of the adoral margin of the crest, varying in size but smaller 

 than the large subambulacral pedicellaria. These are lacking in 

 Integra. 



A single series of actinal intermediate plates is present, which 

 beyond the twelfth or thirteenth inferomarginai bear no spinelets 

 or pedicellariae; the proximal ones bear a tuft of slender spinelets. 



Beyond the basal fourth of the v?iy the adambulacral armature 

 consists of 3 spines (often 4, rarely 5) in a transverse series, the 

 median usually the longest, with a large two- jawed, slender, taper- 

 ing pedicellaria just adorad of the outer spine and another very 

 slender one under the saber-shaped furrow spine, much as described 

 by Koehler for Integra. The subambulacral pedicellaria is lacking 

 on the outer two-fifths of the ray, its place being occupied by 1 to 3 

 small, slender vspinelets. On the basal fourth of the ray the arma- 

 ture is not so uniform. First, in the furrow is the peculiar slender 

 pedicellaria, oriented as described by Koehler, one valve dorsal, 

 the other ventral. The dorsal valve (the lower, as viewed with 

 specimen on its back) is the longer and is frequently curved over 

 the end of the ventral, which is itself slightly curved, the pedi- 

 cellaria resembling, perhaps a bit fancifully, the beak of a pro- 

 cellariform bird in miniature. Next comes the strongly compressed, 

 curved furrow spine proper, followed by a still longer, compressed 

 spine, or, not infrequently, by 1 or 2 long two-jawed pedicellariae, 

 in its place. Following this is sometimes the normal third spine, 

 here the longest, with its adoral large pedicellaria, or 2 large pedi- 

 cellariae, accompanied by 2 or 3 unequal slender spinelets or even 

 1 or 2 small two-jawed slender pedicellariae on the adoral edge 

 of plate. Instead of the single third spine there may be 2 in a 

 longitudinal series, or a triangular group of 3, with or without 

 the large pedicellaria. Sometimes there are 5 spines in a trans- 

 verse row, with 1 or more pedicellariae adorad to them. Ap- 

 parently any of the spines, except the true furrow spine, may have 



