ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS — FISHER. 229 



Adambiilacial plates witli typically one j^roniinent elub-sliai)e(I furrow spine 

 about as lonfj as width of jjlate and behind it on the surface of phito another similar 

 but sli<;htly shorter one, with two to five additional <,'ranules alon<; outer ed^'e, or 

 outer half of plate. Proximally a small adoral coni])ani()n furrow spine is sometimes 

 present, or more rarely two equal spines. The first i)late may bear a peiiicellaria 

 on its surface, in which case there are two furrow and no subambulacral s()ines, 

 but only the mar<;inal fjranules. The spines arc sometimes not so markedly clavatc, 

 but more nearly cylindrical or even slifrhtly tajiered. 



Mouth i)lates with three to five si)ines alouij furrow margin, continued to outer 

 end by three or four jjranules; several <;ranules and sometimes a tubercular spinelet 

 stand alonj; the suture margin. 



All the abactinal, marginal, and actinal sjiines and granules ai-fe immersed in a 

 tliin membrane which is not at all ap]iarent on the surface of the plates and does not 

 in any way obscure the outlines of ])lates. This disaj)pears when specimens are drietl. 



Madreporic body small, midway between center of ilisk an<l mner edge of mar- 

 ginals; striations few, coarse, and radiating. 



Color in life, vermilion or orange vermilion ai>parently, as specimens when 

 received were so tinted. 



Anatomical iwtes. — Intestinal coecum large, consisting of three |>rin(i|)al 

 slightly lobed divisions lying in the trivium and a short lolie lying in the left bivium 

 radius. Gonad in an interradial tuft on either side of membranous interbrachial 

 partition. 



An examiiuilion of the dorsal jilates from the inner or coelomic surface shows 

 that they are similar in arrangement to those of H. spinosa and are fitted together 

 even more closely. The larger and smaller plates are ever\"\vhere intermingled, but 

 on outer part of ray the secondary plates form more definite connecting pieces 

 between the primary plates. The large ])rimary plates are ))olygonal with blunt 

 comers or irregular, the secondary plates are elongate to roimdish. Papuljp single 

 and everywhere exce])t a small interradial area near border. Inner surface of 

 skeleton fairly even, without the honeycombed structure of H. Ittathi. 



Type.— Cat. No. 278S6, U.S.N.M". 



Type-locality. — Albatross station 479o, off Kamchatka, south of Petropavlovsk 

 (lat. 52° 46' 50" N.; long. 158° 44' 30" E.), 60 to 48 fathoms, green sand, pebbles. 



Distribution. — Sea of Okhotsk to southern Bering Sea. 



Specimens examined. — Twenty-eight; from type-locality, si.xteen; from station 

 4794, same locality, 58 to 60 fathoms, sand, jiebbles, eleven; from station 5024, 

 off eastern coast of Sakhalin, vicinity of Cape Patience, Okhotsk Sea, 67 fathoms, 

 sand, pebbles, one. (Albatross, 1006.) 



Remarlcs. — This well-marked species differe from phryyiana and allies in the 

 absence of abactinal spines or tubercles, the center of the jilates bein^ usually 

 smooth ami bare except for an occasional granule or pedicellaria. Likewise, the 

 marginal jjlates lack the characteristic s|)ines of phryyiana. although spines may be 

 present on the lateral face of the plates. The greater jiart of the surface of the 

 marginals is bare. The adambulacral spines arc heavy an<l reduceil to two. forming' 

 a transverse series. 



