EASTERN TROPICAL PACIFIC ASTEROIDEA. 103 



they appear slender and pointed. Pedicellariae also occur on the actinolateral 

 plates but they are not so large as abactinally. In alcoholic material, the 

 rather thick abactinal skin is everywhere elevated into Uttle soft knobs as 

 many as ten or twelve occurring on a single disk-plate; these completely dis- 

 appear when the material is dried. Papulae abundant all over dorsal surface, 

 clear to arm-tips ; usually there is only one to an area but on disk and arm-bases 

 three or four may be found in one area; below the inferomarginals, papulae 

 are very few and small and none occur below the second series of actinolateral 

 plates. 



Adambulacral plates rather longer than usual in Zoroaster ; in the alternate 

 small plates, length nearly equals breadth. Each smaU plate has on its 

 actinal surface in two series, three to five spinelets, the largest being on the 

 furrow-margin; are all more or less sacculate in alcohoUc material; the largest 

 spinelet is frequently replaced by a large pedicellaria and this is particularly 

 so in the larger specimen. Each projecting adambulacral plate has on its 

 actinal surface in two transverse series, four or five spinelets similar to those 

 on the smaller plates, and in addition, there are three much stouter spines on 

 the intraambulacral ridge; of these the innermost is smallest and carries at its 

 tip a huge pediceUaria and two or three small ones; the second spine is thick 

 and blunt, about 2-2.5 mm. long by .50-. 60 mm. tliick at base; the outermost 

 spine is similar but larger, 3-3.5 mm. long, .60-.80 mm. thick. Of other pedi- 

 cellariae on the adambulacral plates or spines, there are very few or none. Oral 

 plates short and small ; each carries three or four spines, of which the innermost 

 is shortest, stands on the outer proximal corner of plate and carries at its tip a 

 huge pedicellaria and one or two smaller ones; the second spine is more slender 

 and stands nearer the radial hne; back of it stands the third and stoutest spine; 

 back of the latter is the fourth spine when it is present, but it may be wanting 

 or it may be replaced by a huge pedicellaria. Pedicellariae of varied size may 

 occur on the sides and at the inner end of the oral plates and in the larger speci- 

 men they are quite abundant. 



Color in alcohol yellow-browTi, but this fades out on drying into a dirty 

 whitish, with papular areas darker and papulae almost black. 



Station 4653. West of Peru about 17 miles, 5° 37' S., 81° 24' W., 536 fms. Bott. temp. 41.3°. Dk.br. 

 gy. shore m. 



Two specimens. 



The general appearance of these two specimens is at first glance quite 

 unlike but when they are carefully compared they are found to be remarkably 



