698 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



encircled by 17 short tentacles with circular small flat crowns; the 

 latter by a number of small pedicels. Ventrolateral amVjulacra with 

 2 series of large robust pedicels, tiiose of outer series two to three 

 times as large as those of inner, which are rather irregularly arranged 

 along a zigzag line; inner series with about 17 also, not counting the 

 small pedicels surrounding anus. Median ventral ambulacrum with a 

 small pedicel at interior third of body, one at posterior third, another 

 a little nearer than midway between the last and anus, and three or 

 four much smaller ones in front of the anus, three of which seem to 

 form part of the group of anal pedicels. Above outer row of pedicels 

 is a series, more or less irregular, of long flank papillae (nonretractile), 

 their walls strengthened b}^ long slender spicules. The longer papillae 

 are 18 to 22 mm. in length and about 1.5 to 2 mm. thick at base. The 

 larger alternate sometimes with shorter slender ones; in all there are 23 

 to one side and 28 or 29 to the other. With two or three exceptions all 

 papillae shown in fig. 2, Plate LXXIV, belong to flank series. Dorsal 

 papillae in an irregular double row along each ambulacrum; of about 

 same length as laterals, but slenderer; 17 or 18 to outer row, about 30 to 

 inner. Deposits: In papillae, long slender rods with expanded spatu- 

 late tips; in pedicels slightly curved rods with short branches near tip; 

 in ventral perisome, robust smooth rods forked at either end and notched, 

 or twice to three times dichotomously branched, the tip with a few circu- 

 lar perforations; in dorsal perisome, smooth rods similar to those of 

 papilla^, but averaging shorter and with tips frequently slightly forked, 

 together with large dichotomously branched rods similar to but larger 

 than those of the ventral perisome, and occasional rods branched only 

 at one end; small spiny and branched rods in wall of gonad. Calca- 

 reous ring consisting of both radial and interradial pieces. Color trans- 

 lucent whitish, the pedicels tipped with orange; papillae with a glassy 

 appearance. Length, 45 mm. ; breadth, about 16 mm. 



Locality. — Station 3979, vicinity of Bird Island, 222 to 387 fathoms, 

 fine white sand, foraminifera, rocks, bottom temperature 54°; one 

 specimen. 



%>d— Cat. No. 21219,U.S.N.M. 



The lateral or outermost series of pedicels is obviously irregular, 

 but in the posterior region is considerably foreshortened. The inner 

 ; eries is not quite so regular, as may be seen from the figure. Outer 

 pedicels average about 5 mm. in length, the inner 2 to 3 mm.; both 

 are rigid, owing to rods in the walls. Pedicels of median ambulacrum 

 considerably slenderer. Three pedicels very obviously belong to the 

 series, since they are arranged along the line of the median ventral 

 muscle band which shows through the bod}^ wall. Of the pedicels 

 surrounding the anus some belong to the median and some to the 

 lateral ambulacra. They are much shorter than any others. Walls 

 of tentacles are strengthened by rods. Crowns do not appear to be 



