162 s. goto: 



" Actinal interradial areas are so much reduced and are paved each with 

 4 small roimdish plates, which bear spinelets very similar to those covering 

 adjacent iiiferomarginals. 



" Mouth plates are prominent, the armature, unfortunately, having been 

 largely destroyed. Tlie marginal spinelets are rather slender, slightly flattened, 

 the innermost 2 or 3 of each plate forming at each mouth angle a horizontal 

 fan of 4 to 6 teeth, of which the median are longest. 



"Tube feet large, with an incipient conical sucker at end, easily dis- 

 tinguisliable from the rest of the foot, 



" Madreporic body is not visible superficially ; hidden by the paxiHse. 



" Colom- in life : PaxiUar area of distal lialf of arms vinaceous cinna- 

 mon ; remainder of arms, and disk, fawn colour. The dorsal integument, 

 largely liidden by the regular and ornate paxillœ, is bright vermihou, the 

 colom' being visible between the spinelets of the paxillee. Spines of supero- 

 marginal x^lates, orange bufl'. Marginal plates, inferomarginal spines, and entire 

 actiual sm-face, light buff pink. Colom* in alcohol bleached yellowish. 



" Locality : Station 4168, vicinity of Bird Island, 20 fathoms, coral, 

 shells, and foraminifera. Bottom rough. 



" Only a single specimen of tliis handsome species was secured, and 

 that unfortunately, is not peiiect. I have felt some misgivings in referring 

 it to poluacanthus, having been obliged to depend wholly on the original 

 description. In proportions the specimen agrees most nearly with Müller 

 and Troschel's description of armatus (System der Ästenden, p. 71), from 

 Japan, which Sladen and others consider the same as polyacanthus, the type 

 of which came from the Red Sea. The descriptions of these two species 

 cei"tainly differ in many points, and presumably the types do also, but in 

 view of the ojainion of Sladen and Perrier I have accepted the present 

 name. I have given a full description, with figures, tliat there may be no 

 mistaking the particular form referred to, whether the name be correct or 

 not. * 



" This species may be readily distinguished from others of the genus 

 inliabiting Hawaiian waters by the row of erect superomarginal spines, the 

 second and sometimes the third superomarginal lacking the spine ; and by 



