118 iSULLETIN 100, UNITED STATES NATIOlSrAL MUSEUM. 



or round tipped. Similarly the superomarginal squamules of these 

 specimens are slenderer. 



Actinal intermediate plates extending two-thirds the length of 

 ray in a single series; and in a double series as far as the eighth 

 inferomarginal of type, and fifth of cotype (station 5116). The type 

 seems to lack actinal intermediate pedicellariae, but a few are present 

 in the cotype, next the proximal adambulacral plates. 



Adambulacral armature similar to that of euryactis^ but differing 

 slightly in having more subambulacral spines. Proximally there 

 are 8 or 10 in 2 series with the beginning of a tliird, and distally 

 there are 12 to 14, in 3 irregular series, or without very definite serial 

 arrangement. Furrow spines 6 or 7 in type, 7 or occasionally 8 in 

 cotype, compressed, long, round-tipped or dully pointed. The mouth 

 plates do not show anj^ marked points of difference. 



Color in life: "Salmon color" above, below verj^ light (specimen 

 from station 5111). 



Type.— C^t. No. 30521, U.S.N.M. 



Type-locality. — Station 5301, China Sea, vicinity of Hongkong 

 (lat. 20° 37' N.; long. 115° 43' E.), 208 fathoms, gray mud, sand, 

 bottom temperature 60.5° F. 



Distribution. — Vicinity of Hongkong to southern Luzon, 200 to 

 236 fathoms. 



Specimens examhied. — The type, and 1 specimen from each of the 

 following stations : 



Station 5111, Balayan Bay, Luzon (13° 45' 15" N.; 120° 46' 30'^ 

 E.), 236 fathoms. 



Station 5116, same locality, 200 fathoms, bottom temperature 

 50.2° F. 



Remarks. — Perseplwnaster anchistus is very close to P. euryactisy 

 but the difference in the inferomarginal armature is constant. The 

 specimens from Balayan Bay have the additional difference of pos- 

 sessing slender, pointed, inferomarginal spinelets. 



Through lack of specimens it has not been possible to decide sat- 

 isfactorily the status of this species. It is one of those exasperating 

 forms which presents a close similarity to another species, yet has an 

 obvious difference, the value of which it is not practicable to test 

 rigorously on account of insufficient material. 



PERSEPHONASTER LUZONICUS Fisher. 



Plate 23, fig. 3 ; plate 24, fig. 1 ; plate 36, fig. 3, 3a-6. 

 Perseplwnaster Inzonicns Fishek, 1913a, p. G14. 

 Diagnosis. — Resembling, in armature, P. euryactis hrevispinus, but 

 with narrower, evenly tapered rays, much narrower paxillar area,, 

 fairly large compact paxillae having slightly shorter spinelets, nar- 

 rower inferomarginal plates, and a shorter series of actinal inter- 



