ASTEROIDEA OF XORTU PACIFIC AND ADJACENT WATERS — FISUEK. 335 



glomerular tufts of numerous (twenty' or even more) long, delicate, glassy spiculi- 

 form spinclets, flattened, flaring, and with two or three, rarely four, delicate rather 

 long teeth at the tip, tliese spineiets about 1 to 1.2 mm. in lengtli and radiating in all 

 directions; paxilloe largest on disk, decreasing in size toward end of ray. Papulae 

 two or three to a mesh of the skeleton in small specimens, gradually increasing with 

 the size of the individual to about sLx or eight in type. There are more on disk 

 than on the rays. Abactinal plates with four lobes on the lateral portions of the area 

 and with two, three, four, or even five on the midradial region, where the meshes 

 are irregular, five- or four-sided, and larger than the lateral quadrate meshes. All 

 the meshes are much larger than in furcifrr. 



Marginal paxillas forming two conspicuous series alongside of ray: they are well 

 spaced and the superomarginals stand above the inferomarginals -that is, do not 

 alternate. Superomarginal paxilhe much larger than the adjacent abactinal, and 

 with stouter and longer pedicels (3.5 mm., type), and the spineiets have a number 

 of sharp teeth scattered along the outer part (PI. 114, lig. 1/); sometimes they are 

 trifurcate. Inferomarginal paxilhu similar to the superomarginal, but sometines a 

 trifle more robust; about twenty-three to twenty-five to a ray in tj-pe. 



Adambulacnil plates short and broad, with wide intervals between successive 

 plates, the suture being wider than the length of exposed surface of plate; furrow 

 series consisting of four spineiets at base of ray, wliich are soon reduced to three, 

 then to two beyond middle of ray, and finally to one; these spineiets rather long, 

 deUcate, skin-covered and united for a third or a half their length by a web; when 

 there are four, the}' are graduated in length toward the adoral, which is shortest; 

 when there are three, the middle is usually longest, and commonly the adoral when 

 there are two; the separate series well spaced from one another and the spineiets as 

 long as or even longer than width of the plate. On the actinal surface is a series 

 of four, three, or two longer and more robust, tapering, pointed spineiets, disposed 

 in an oblique transverse series, and decreasing in length as they recede from the 

 furrow, skin-covered, often having lateral expansions, and the bases united by 

 membrane; when there are three or four spines the outer is usually much shorter 

 than the rest. Northern specimens, jis, for example, from station 3075, have the 

 spineiets much more heavily enveloped with membrane. 



Mouth plates fairly large, spade-shaped, and prominent actinally; median 

 suture wide, roofed with membrane; furrow spineiets seven or eight, long, skin- 

 covered, united for about a third to a half their length by a web, increasing very 

 slightly in length toward the innermost, which is rather more robust than the 

 others. Near the middle of the suture margin are one to four much slenderer 

 spineiets, which are shorter than those on furrow. They are webbed basally. 

 The t}rpc has only one or two spines; apparently the specimens from very great 

 depths have the fewest and slenderest suborals. 



Actinal interradial areas much reduced and with few spine-bearing plates in each 

 interradius. The type has about eight or nine low paxillie within the area deter- 

 mined by the fii-st marginal paxilhe. Ai\ extreme specimen from station 4237 not 

 tvpical has about twenty-four i)lates, including the area to the limit of two rows of 

 plates on each ray. These paxilla- have low peilicels und spineiets somewfiat 

 longer ending in several points. A single scries extends from the third inferomar- 



