ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS — FISHER. 139 



cellari.v; in the constantly extensive papular areas; in the typically larger disk. 

 R = 168 mm.; r=22 mm.; R = 7.6 r. ; breadth of ray at base, 26 mm. 



Description. — The dorsal pectinate pediccllarise arc scattered thickly over 

 the abactinal area, extending far along my, especially near the marginal plates. 

 The pcrfoct pediccllarise of disk and proxunal ])ortion of ray consist of two combs, 

 each with aliout twelve taj^ering sharp, convergent sjiinelcts. Smaller ])lates have 

 often only three spinelets to a comb, and sometimes there is one comb without an 

 opposing companion. The accessory or secondary spinules (five to eight) are very 

 unequally developed on primary plates. Only two or tliree may be developed to 

 any size, these occasionally attaining the length of the primary spine, while the 

 rest are successively shorter; or two, three, or four accessory spinules are developed 

 to one-half or more of the length of the primarj-, and no other spinelets are present 

 on plate: or, the spinides are short and form a ring around the ba.se of the spine. 

 Many of the largest plates have ji number of small spinelets in addition to the 

 accessory spimdes. The secondary plates have a rudimentary central spine, with 

 a few small spinules, or else the latter only. 



Papuh^ very numerous, all over disk, and extending along ray as far as the 

 twenty-eighth to the thirty-fifth supcromarginal, or beyond middle of ray. Beyond 

 about the fourteenth or fifteenth supcromarginal they are confined to either side 

 of median radial area. 



Three specimens have five odd interradial superomarginals, one has four, and 

 one has two. The spines of the marginals are similar to those of varwhiUs. Some 

 of the proximal inferomarginals have four or five subequal slender, tapering, blunt 

 spines in addition to six or more shorter accessory spinules; over most of the ray 

 there are three primary spines, and distally two. The accompanying accessory 

 spinules are conspicuous, four or five, or sometimes more; occasionally two or 

 three are nearly as long as the primaries. In addition, small-spaced spinelets are 

 present, especially on actinal surface of plate. The first few superomarginals (as 

 well as mferomargiuals) have a vertical single or double series of six or eight acces- 

 sory spinules, in addition to two or three stout, long, sharp primary spines (near 

 end of ray only one). P'arther along ray the accessory spinules are slenderer and 

 shorter, seven or eight in number and grouped around the longer spines. In addi- 

 tion to these are several small scattered sjiinelets in a ring, outside the spinules. 

 On the vertical suture between many of the inferomarginals, but of irregular occur- 

 rence toward end of ray, is a conspicuous pectinate pedicellaria with two opposing 

 combs of about twelve slender spinelets. The actinal interradial areas have usually 

 one or two large pe(hcellari« and a few rather long spinules. 



The adambuhifrul j)lates have a palmate fiUTOw series of about six or seven 

 slender, untapered, round-tipped spinules, the two or three central ones longer 

 than width of plate and the others graduated on either side, the lateralmost 

 spinelet being very short. Not quite typical examples have five furrow spinules. 

 There are usually two (proximally three) slender, long, tnmcate spines in a 

 diagonal transverse series on the actinal surface of each adambulacral, the outer 

 being shghtly the longer, and situated nearer the adoral margin of plate. These 

 spines are proximally about two and one-half times as long as width of plate. 



