STARFISHES OF THE PHILIPPINE SEAS. 187 



marginals or on the suture between inferomarginals and adambula- 

 crals (fasciculate), these extending usually half to two-thirds the 

 length of ray; the jaws are 3 to 6, stout, flattened, pointed, blunt, or 

 truncate; (4) 10 to 22 fasciculate or fasciculate-pectinate pedicel- 

 lariae on each interradial area. In addition to the pedicellariae, 

 which have 2 to 8 jaws, the actinal intermediate plates bear a rela- 

 tively few subequal papilliform spinelets. 



The abactinal muscle bands are attached to the outer end of the 

 fifth ambulacral ossicle which is conspicuously higher than the pre- 

 ceding ones; sometimes it is the fourth on one side of ray and fifth 

 on the other. 



Papular areas broadly elliptical, swollen, bisected by a line pass- 

 ing across ray at outer end of interradii ; papular pores about 20. 



Type.—C2Jt. No. 37003, U.S.N.M. 



Type-locality. — Station 5349, Palawan Passage (lat. 10° 54' N.; 

 long. 118° 26' 20'' E.), 730 fathoms, coral sand, bottom tempera- 

 ture 40.6° F. ; 6 specimens, all more or less mutilated. 



Distribution. — Known only from type-locality. 



Remarks. — While this form is evidently very closely related to 

 P. mimicvs, it is not at all evident whether it represents a geo- 

 graphical race, or simply a local variation, because the specimens 

 were all taken at a single haul. The characters seem to call for more 

 formal recognition than would be accorded them under a discussion 

 of variations. 



This race, we may not unreasonably conjecture, occupies the China 

 Sea basin at depths between 700 and 1,000 fathoms. 



PECTINASTER HYLACANTHUS Fisher. 



Plate 48, fig. 2 ; plate 49, fig. 2 ; plate 54, fig. 1. 



Pectinaster hylacanthus Fisher, 1913c, p. 204. 



Diagnosis. — Belated to P. mimicus Sladen, from which it differs 

 in having the central spines of the paxillae distributed all over the 

 abactinal surface, and in having 13 (exceptionally 12 or 14) adam- 

 bulacrals corresponding to the first 10 inferomarginals. R=79 mm., 

 r=10.5 mm., E=7.5 r approximately; breadth of ray at base, 11 to 

 12 mm. General appearance similar to that of P. mimicus; disk 

 small, rays long, slender, recurved at tip ; superomarginal plates con- 

 fined to side wall of ray, with an upright sharp spine close to, or 

 on upper margin; normally no abactinal pedicellariae; abactinal 

 spines numerous and generally distributed; ^mall spinelets in 1 or 

 sometimes 2 circles surrounding base of spine ; adambulacral furrow 

 spines 7 or 8 at base of ray; pedicellariae variable, present usually 

 on actinal interradial areas, and sometimes also intermarginally, and 

 on actinal surface of intermarginals. 



