STARFISHES OF THE PHILIPPIXE SEAS. 157 



Plutonaster in having an odd interradial series of actinal interme- 

 diate plates, and a different type of marginal armature ; from Tethy- 

 aster in having the gonads confined to the interradii, and a less 

 angular and less astropectenoid type of adambulacral armature. 

 From Leptychaster^ to which it is closely related, Patagiaster differs 

 in having armed inferomarginals and a less angular and longer 

 comb of furrow spines, as well as a truly concealed madreporic body. 

 In Lepty chaster the testes are serially arranged along either side of 

 the ra3^ Avhile the ovaries are strictly interradial and in a single 

 tuft on either side of the interradial septum. 



Genus KOREMASTER Fisher. 



Koremaster (subsemis) Fisher, 1913rt, p. 623. Type, Dy taster {Korem- 

 astcr) evaulus Fisher. 



Diagnosis. — Differs from typical Dytasfer in having a very weak 

 abactinal integument. Astropectenlike paxillae with well-developed 

 pedicels and relatively long, slender spinelets; and in having the 

 marginal fascioles well developed. Pedicellariae, marginal armature, 

 and adambulacral armature, gonads, and alimentary system as in 

 Dytoster. An odd interradial series of actinal intermediate plates, 

 often irregular, is present, and the madreporic bod}^ is smaller and 

 less densely covered Avith paxillae than in Dylaster. 



KOREMASTER EVAULUS (Fisher). ( 



Plate 33, fig. 2 ; plate 34, fig. 2 ; plate 40, figs. 2, 2a-e. 

 Dytasfer {Koremaster) evaulus Fisher, 1913ff, p. 623. 



Diagiiosis. — Eays 5. E = 62 mm., r==:15.5 nun.. R = l: r: breadth 

 of ray at interbrachium 19 mm., at tenth superomarginal 9 mm. ; 

 interbrachium arcuate or rounded-angular; rays arcuately taper- 

 ing and narrow beyond the basal fourth; abactinal integu- 

 ment inflated; paxillae well developed, often penicillate, with fairly 

 tall pedicels and slender, pointed, thorny spinelets; abactinal. glo- 

 bose pedicellariae; well-developed marginal fascioles; marginal 

 plates small, blocklike, with a stout conical spine; actinal inter- 

 mediate pedicellariae; furrow spines much compressed, 7 or 8; sub- 

 ambulacral spines, 6 to 10, 1 being enlarged; usually 1 or 2 sub- 

 ambulacral pedicellariae; first adambulacral plate compressed; mar- 

 ginal mouth spines much compressed. 



Description. — Abactinal integument rather thin, inflated. Paxil- 

 lae fairly uniform, not crowded, with well-developed pedicels on 

 disk and proximal half of ray, becoming low and DytasterASk^ on 

 the outer part. Largest paxillae are on the madreporic body, but 

 aside from these the next largest are found in the interradial regions 

 and adjacent portion of the proximal half of ray, the smallest 

 paxillae being on center of (\'vA.\. midradial line, and distal half 



