ASTEBOIDEA OF NORTH PACIFIC AND ADJACENT WATERS — FISHER. 307 



KEY TO THE SPECIES OF 80LA8TER BEBEEN DESCRIBED. 



o'. Two rows of marginal plates clearly distinguishable, the superomarpinals much the smaller and 

 situated just above the inferomarginals, though sometimes alternating with them. Abactinal 

 skeleton close meshed. 

 b'. Furrow spineleta much shorter than the actinal adambulacral spinelets, which are not conspicu- 

 ously long and bristling. Abactinal pseudopaxillo; small, spaced or crowded; marginal platee 

 of both series low and not forming a conspicuous border, 

 c'. Pseudopaxillie very small and crowded ; disk larger, rays shorter; inferomarginal pseudopaxills 

 larger with upward to thirty-two spineleta; superomarginal pseudopaxillie very small. 



enckca, p. .'507. 



(P. Peeudopaxillse larger (but with few epinelete) and more epaced; rays longer, disk smaller. 



Less difference in size between supero- and iuferomaiginal paxillsc, the latter with upward 



to eighteen spineleta (a combination of all these characters necessary rather than a single one 



without the others, individual variation being wide in both endeca and slimpaoni). 



siimpsoni, p. 311. 

 6'. Furrow spinelets long, reaching nearly to tip of actinal spines, which form a bristling fringe all 

 along either side of furrow; pseudopaxillie more or less tabulate and flat-topped except in 

 exiguus, and larger than in 6'. Marginal plates forming a conspicuous border to rays, 

 c'. Actinal adambulacral comb of spines straight, notcurv'ed aborally at inner end; actinal inter- 

 radial areas small; Buperomarginals typically opposite inferomarginals dawaoni, p. 313. 



c'. Actinal adambulacral comb of spines curved at inner end; euperomarginals typically alternating 



with inferomarginals. 



<P. Disk large, actinal iutenadial areas large; inferomarginal paxilke prominent, much broader 



than long, and somewhat fan-shaped, the spinelets numerous and not longer than the 



pedicel; furrow spineleta proximally three or four, Buboral spines numerous, about 



fifteen paxillatut, p. 315. 



tP. Disk small; actinal interradial areas small, inferomarginal paxilke subcircular, not fan- 

 shaped, well spaced, with a tuft of delicate spinelets longer than the pedicel; furrow spines 



proximally two or one, unusually long; suboral spines two to four exiguus, p. 319. 



a'. Marginal paxillsD of one kind, very conspicuous, well spaced, in a single series (superomaiginale 

 practically indistinguishable from abactinal paxUloe). 

 6'. Abactinal skeleton not wide meshed; paxilla; not large and penicillate, but small with two to 

 seven short spinelets; marginal plates with a few prominent sharp spines; a bare interradial 

 streak along each interradius. 

 c'. Suboral spines small, one or two, or none; actinal comb of adambulacral spines with two to 

 five, usually four, sharp spines; furrow spinelets small, typically much shorter than the first 

 actinal (less than half); abactinal pseudopaxillse with three or four short spinelets. 



borealis, p. 320. 



c'. Suboral spines five to seven very prominent; actinal comb of adambulacral spines with six 



long spines; furrow spinelets typically more than half as long as first actinal; abactinal 



pseudopaxillse higher, with seven to ten spineleta hypothrisims, p. 324. 



6^ Abactinal skeleton wide meshed; paxillte large, spaced, and penicillate; marginal paxills large 

 with numerous prominent spines, 

 c'. Furrow spines usually three or four not joined by a web to the actinal comb; maiiginal paxilke 

 less numerous, and separated from each other by more than their own width. 



papposxu, p. 325. 



<?. Furrow spines seven to nine webbed, and joined by a web to the actinal comb; marginals 



more numerous and separated by less than their i>wn width japonicut, p. 330. 



SOLASTER ENDECA (LlnnKiu). 



PI. 81; pi. 82, figs. 1,2,4. 



AtterUu endeca Linn.eu8, Mantis-^a Plantarum, Appendix, 1771, p. 543.— Retzius, Nya Ilandl. 



Kongl. Sveuska Vet. Akad., 1783, p. 237. 

 Aaterias aspera O. F. MCller, Zoologiao Danicte Prodromus, 1776, p. 234. 

 Aatcriat alboverrucota Brandt, Prodromus, 1835, p. 71 (according to Ludwig). 



