158 BULLETIN 76, UNITED STATES NATIONAL MUSEUM 



Crossed pediceUariae (pi. 71, fig. lb), numerous, averaging 0.25 to 0.27 mm. 

 with many as small as 0.225 mm. They are attached at the base, sometimes on the 

 base, of the spinelets around which they form complete or partial circlets. They are 

 present sparingly on the inferomarginal spines, except the inner or lowermost which 

 carries them only sporadically. 



Straight pediceUariae roughly of two sorts: (1) Larger, pyriform or ovoid, 

 dentate or unguieulate ones scattered over the surface of the body here and there 

 along the furrow margin, and on the oral plates. (PI. 71, figs, lc, 1/.) These appear 

 to be common only in the largest specimens where they measure from 0.8 to 1.2 mm. 

 (2) Lanceolate blunt forms with or without a few terminal teeth, and much smaller 

 than the above are scattered over the body and along the furrow margin. In most 

 specimens these are the prevalent type and vary greatly in size, from the length of 

 the crossed pediceUariae to 0.5 or 0.6 mm. On big specimens (R 50 mm. or more) 

 they intergrade in size with (1). (PI. 71, figs. Id, le.) 



Madreporic bodies usually two, in opposite interradii near the margin of disk. 

 Some but not all small, 6-rayed examples have one madreporite. Ordinarily fission 

 takes place on a plane between the two madreporites, but there are a number of 

 exceptions, as for instance the large 7-rayed example, Plate 70, Figure 1, station 3548. 

 Specimens in process of acquiring new rays usually have the second madreporite 

 undeveloped on the regenerating part of the disk. 



Type locality. — Grand Manan, New Brunswick (at mouth of Bay of Fundy). 



Distribution. — On the Atlantic coast of North America "it is common from low- 

 water mark to 100 fathoms in the Bay of Fundy and oft' the coast of Nova Scotia. 

 Dredged at more than 100 stations between north latitude 46° 50' and 35° 12' 30". 

 Off Cape Hatteras and off South Carolina it is common in 16 to 50 fathoms. Common 

 south of Marthas Vineyard in 50 to 150 fathoms. In depth its range is to 229 

 fathoms; in one case recorded from 435 fathoms, off Delaware, and once from 1,253 

 fathoms." (Verrill, 1914, p. 148.) The species has been taken on the east, south, 

 and west coasts of Greenland as far north as latitude 80°; from Ellesmere Land, 

 Jones Sound, Cumberland Gulf; Iceland; Jan Mayen; Spitzbergen; Murman coast; 

 Barents Sea; Kara Sea and Kara Strait; Matochkin Strait, Nova Zembla. (See 

 Von Hofsten, 1915, p. 57.) 



In the north Pacific region the species has been taken in 33 to 350 fathoms from 

 southern Bering Sea to Lynn Canal, southern Alaska. 



It has been recorded by Marenzeller (according to Von Hofsten, 1915), from 

 1 ,000 to 1 ,200 meters, Japanese Sea. 



The species is probably completely circumpolar in distribution, but it is to be 

 noted that no specimens have been taken in northern Bering Sea, nor from the Arctic 

 Ocean just north of Bering Straits — regions which have yielded other species of arctic 

 sea stars. 



Specimens examined. — Seventy-four. 



