ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS FISHER. 181 



then very gradually to the bUint extremity; interbraehial arcs wide and rounded; 

 abaetinal area siil)|)huie, only a trifle inflated on eenter of disi\. Abaetinal paxillse 

 small, erowded and regular, about two opposite eaeh marginal plate, and with 

 five to seven polygonal or subi>risniatic granules surrounded by twelve to fifteen 

 slenderer papilliform spinelets on periphery of tabulum. Abactinal plates with 

 five or six prominent lobes. Marginal plates broad with close-set, flat-topjjed hex- 

 agonal granules. Inferomarginals with a transverse row of small appressed, 

 squamiform, pomtetl spinules. Adambulacral plates with five or six strongly com- 

 pressed furrow spinelets, and on actinal surface one or two eidarged spinules sur- 

 rounded by numerous shorter granuliforin spinelets to the number of fifteen to 

 twenty-two, all thick, heavy, and membrane-investetl. Mouth plates wath median 

 tooth. Actinal interradial areas large; plates covered with rather crowded, swollen, 

 polygonal, papilliform unequal granules, those in center more robust, clavate, with 

 flaring ti|>s. Many plates with a central enlarged spinule. Fasciolar channels or 

 pectinate jietiiceilariiB between plates adjacent to adambulacrals, these continued 

 toward margin but less conspicuoush'. Spinelets forming roof of fascioles slender. 

 Superambulacral plates present. 



Description. — Abactinal paxilliE small and crowded fairly regular, largest on 

 proximal radial regions, very crowded and small at ends of rays where only the median 

 radial series attains the termuuil ])lates but the two adradial nearly reach it : one 

 and one-half to two paxillae correspond to each marginal plate. The larger paxilhe 

 have five to seven polygonal or subprismatic, robust, truncate granules, heavier at 

 tip than at base, and occupying surface of tabulum, while on the i)eri])hery are about 

 twelve to fifteen much slenderer papilliform or subprismatic spinelets. The spine- 

 lets may be very comjjactly placed or form a more or less open group. Along the 

 border of the area the paxillae are compressed, the tabulum being elliptical and 

 crowned with two rows of eight to ten granules in all. 



Abactinal plates with five or six distinct lobes by which the plates touch or 

 overlap; toward margin, plates often very irregularly lobed, or without lobes. 

 They are arranged in series parallel with median radial. Papuhe, one to an area, 

 six about each plate; but absent from terminal half of ray, where the plates are 

 without lobes, being irregularly hexagonal or oval. 



JIarginal plates broad and short, encroaching conspicuously upon both areas. 

 Superomarginals, fifty-eight in number from interradial line to extremity of ray, 

 vary in width, and are wider m interbraehial arc than elsewhere (S..5 to !) mm. 

 wide in large examples). They form an even bevel, more or less arched on outer 

 part of ray and are covered with regular, close hexagonal granules in five to seven 

 transverse rows which are coarser at the outer (lateral) end of the plate. The 

 margmal granules are smaller and form very regular series. Granulation has 

 appearance of being very regular, compact, and smooth. Grooves between plates 

 mvisible from exterior, and probably not functioning as fascioles. Terminal plat« 

 medium-sized, obovoid, covered with granules. 



Inferomargmals correspond to superomarginals in position, though there is 

 usually one atlditional plate at tip of ray, and the}' are a trifle wider. Covereil 

 with coarse hexagonal granulation, which increases rapidly in coareeness toward 

 margin of ray. In some speciniens the granules are slightly squamiform. In the 



