NO. 2022. NEW STARFISHES FROM THE PHILIPPINES— FISHER. 209 



to each abactinal plate of the ray, much larger interradial supero- 

 marginal spines, no accessory superomarginal spines, fewer infero- 

 marginal pedicellariae (none on outer part of ray), fewer furrow 

 spines. R = 105 mm., r=10.5 mm., R, = 10 r; breadth of ray at 

 base, about 10 mm.; odd interradial superomarginal spine, 17 mm. 

 long. The inferomarginals bear 2 spines, the lower one-half to three- 

 fourths the length of the upper, similar to those of B. polyctenius. 

 The plates of outer third of ray are very slender and bear as a rule 

 only 1 spine. Between the plates of proximal half of ray is a pec- 

 tinate pedicellaria, but these may be absent from a number of plates, 

 their occurrence being subject to variation. Actinal interradial 

 areas small, bearing each 2 large pectinate pedicellariae. Furrow 

 spines 7 or 8, slender, bluntly pointed, the successive combs spaced 

 a little less than their base line. (In B. polyctenius a comparable 

 specimen has 9 to 1 1 spines, the combs spaced only one-half the length 

 of their base line.) Subambulacral spines 2, the outer slightly the 

 shorter, with a third quite small spinule usually present adorad of the 

 outer spine. Nineteen to 22 plates correspond to first 10 infero- 

 marginals, omitting the odd interradial. Oral spines 6; suboral, 3, 

 in a series along middle of plate. 



Type.—Csit. No. 32631, U.S.N.M. 



Type-locality. — Station 5668, Macassar Strait (lat. 2° 28' 15'' S.; 

 long. 118° 49' E.), 901 fathoms, gray mud; bottom temperature, 

 38.2° F. 



Family OREASTERID.E. 



PENTACEROPSIS TYLODERMA. new species. 



Differing from P. ohtusata in having shorter rays, 1 series of sub- 

 ambulacral spines, in lacking inferomarginal tubercles except on the 

 first few plates, in having less prominent distal superomarginals 

 without smooth tubercles, and very much smaller granules among the 

 papulae than on the convex plates. R = 94 mm., r = 49 mm., R = 1.9 r.; 

 breadth of ray at base, 44 to 54 mm. Disk inflated, rays convex, 

 much lower than disk; actinal surface subplane; interbrachial arcs 

 well rounded; rays broad, tapering little until near the end, which is 

 rounded. No true spines anywhere except on adambulacral and 

 mouth plates. 



Abactinal surface paved with plates of about 3 sizes, but only 

 2 of these are evident externally because the small ossicles which 

 fill in the spaces between the large plates are covered with gran- 

 ules. There is a not very regular carinal series of about 12 con- 

 vex, transversely elliptical plates, starting with the primary radial, 

 spaced about one-fourth to one-half their longer diameter, which 

 varies from 4 to 7 mm. Between this and the superomarginal series 

 are 3 others, not at all regular, spaced, convex, decreasing in size 

 toward the margin, the adradial plates being transversely elliptical, 



95278"— Proc.N.M.vol.46— 13 14 



