NO. 1944. NEW GENERA AND SPECIES OF STARFISHES— FISHER. 623 

 PATAGIASTER SPHiERIOPLAX, new species. 



Differing from P. nuttingi Fisher in having shorter, broader rays, 

 larger paxillsB with more numerous granules; in having the paxUlse 

 in a definite radial, and parallel longitudinal series; in having broader 

 marginal plates and slenderer actinal spinulation. R = 28 mm., r = 

 12 mm., R = 2.3 r; breadth of ray at base 13.5 mm. Disk large, rays 

 short, tapering from wide roimded interbrachia to a pointed extremity; 

 general form depressed; sides of ray rather thin, rounded; larger 

 paxillae with 30 to 40 elongate, regular, bead-like granules surrounded 

 by a peripheral series of nimierous, slender, short spinelets, some of 

 which are intermediate in form with the central granules; furrow 

 spines slender, pointed, slightly compressed, in a regular comb of 6, 

 sometimes 7, the contour of the distal margin being curved; sub- 

 ambulacral spmes 12 to 16 slender, terete, with prickly tips, usually 

 in 3 longitudinal series, the 3 or 4 spines back of the furrow series 

 being nearly as long as furrow spines; actinal intermediate plates 

 with a conspicuous keel, and carrying a paxilliform group of 15 to 



18 slender, rather long spinelets, those in the center the stoutest 

 (longer and slenderer than in P. nuttingi). 



Type.— Cat. No. 30531, U.S.N.M. 



Type-locality. — Station 5178, vicinity of Romblon Island, Philip- 

 pine Islands (lat. 12° 43' N.; long. 122° 06' 15" E.), 78 fathoms, 

 fine sand. 



Genus DYTASTER Sladen. 



KOREMASTER, new subgenus. 



Differs from typical Dytaster in having a very weak abactinal integu- 

 ment, Astropecten-like paxillae with well-developed pedicels and 

 relatively long, slender spinelets ; and in having the marginal f ascioles 

 well developed. PecUcellariae, marginal armature, and adambu- 

 lacral armature, gonads and alimentary system as in Dytaster. An 

 odd interradial series of actinal intermediate plates, often irregular, is 

 present and the madreporic body is smaller and less densely covered 

 with paxillae than in Dytaster. 



Type of the subgenus. — Dytaster {Koremaster) evaulus, new species. 



DYTASTER (KOREMASTER) EVAULUS, new species. 



R = 62 mm., r = 15.5 mm., R = 4 r; breadth of ray at interbrachium 



19 mm., at tenth superomarginal, 9 mm.; interbrachium arcuate or 

 rounded-angular; rays arcuately tapering and narrow beyond the 

 basal fourth; abactinal integument inflated; paxillae well developed, 

 often penicillate, with fairly tall pedicels and slender, pointed, thorny 

 spinelets; abactinal, globose pedicellariae ; well developed marginal 

 f ascioles; marginal plates small, block-like, with a stout conical spine; 

 actinal intermediate pedicellariae; furrow spines much compressed, 7 



