160 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



and the series is continued along the adanibidacral margin by a 

 number of smaller, cylindrical, pointed spines. Numerous similar 

 spines cover the surface of the plates forming 2 or 3 irregular series. 



Madreporic body 5 mm. in diameter, or one-third minor radius, 

 and situated less than its own diameter from margin of paxillar 

 area. Fine, irregular striae proceed from near the center. About 

 15 paxillae spring from the surface. 



Color in alcohol, bleached yellowish. 



Tube feet rather large, pointed, but with a small conical knob at 

 the tip ; no deposits. 



Type.—Q2X. No. 30532, U.S.N.M. 



Type-locality. — Station 5606, Gulf of Tomini, Celel)es, bS-t fatli- 

 oms, green mud. 



Distribution. — Known only from Gulf of Tomini, Celebes. 



Specimens examined. — The type and a specimen from station 5601,. 

 Gulf of Tomini, Celebes, sand, globigerina, and pteropods. 



Remarks. — This species is remarkable for the typical paxillae and 

 well-developed marginal fascioles. Among the species of Dytaster 

 dredged by the Challenger it shows most resemblance to D. spinosuSy 

 but has perpendicular sides to the ray, taller and more penicillate 

 paxillae, and characteristic pedicellariae. D. aequivocus Sladen is a 

 very immature form from the Arafura Sea, west of the Aru Islands, 

 800 fathoms. Ou this account it can not be compared with Korem- 

 aster eraidua. 



The genus '■'Crenaster " of Terrier is based on the absence of actinal 

 intermediate and abactinal pedicellariae, on the smaller number of 

 actinal intermediate plates, and on the presi'nce of an enlarged sub- 

 ambulacral spine. Yet in the descriptions of Crenaster tnollis and 

 C. spinulosus no mention is made of this enlarged spine. In Dytaster 

 grandis the enlarged subambulacral is presi'ut on the outer part 

 of the ray and there are abundant pedicellariae. Both forms of 

 Koremaster have the enlarged subambulacral spines plus pedicel- 

 lariae. The distinctioQ based on less numerous actinal intermediate 

 plates does not hold. In so far as '■'■ Crenaster'''' rests on these char- 

 acters it is not a workable group. 



Koremaster differs greatly in appearance from typical Dy taster y 

 such as nohilis and grandis {=madrepoHfer Sladen). The paxillae 

 are higher, w^ith long spinelets, and are more like those of Astro- 

 pecten; the marginal plates, at least proximally, have well-developed 

 fascioles, and are therefore thicker than in typical Dytaster; the 

 actinal intermediate plates are more convex and paxilliform. while 

 an irregular odd interradial series of plates is present. In typical 

 Dytaster this character is apparently variable, but exact data are 

 lacking in some species. The odd series is present in gilherti, but 



