548 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



The radials, which are about half again as broad as the median length, are 

 united for a distance about equal to two-thirds of that of the apposed sides of 

 the basals. 



The radianal is entirely excluded from the radial circlet. 



There are about five brachials. 



No. 38 (figs. 927, 928, p. 545) : Dredged on June 25, 1902, in 385 meters. 



The crown is about 3 mm. long. 



There are 29 columnals, the distal portion of the stem being lost. The top- 

 most columnal has become slightly thicker than those following and has broadened, 

 the addition of new material being mainly in the interradial regions, which are 

 also thickened more than the radial regions, so that in end view it would appear 

 as a pentagon with broadly rounded angles. This seems to be in preparation 

 for the formation of the five plates described in connection with the oldest penta- 

 crinoid (No. 43). The next five segments, which are thin and discoidal, gradually 

 decrease in diameter; the next is slightly over twice as broad as long; the follow- 

 ing half again as long as broad; and the succeeding twice as long as broad. The 

 articulation between the two last and between all those following is of the bour- 

 gueticrinoid type, the long axes of the ellipses on the two ends of each columnal 

 crossing each other at right angles. The earlier elongated columnals have flat- 

 tened ends, so that they appear as long trapezoids in lateral view, but the later 

 gradually increase in diameter toward each end. The columnals increase in length 

 to the twenty-third and following, which are between four and five times as long 

 as broad; the last four or five in the column as preserved decrease again. 



The basals form a relatively low ring. 



The radials form a ring which is about the same height as that formed by 

 the basals. Their lateral edges, by which they are in contact with each other, are 

 about as long as those of the basals. Their distal borders are gently concave 

 for the reception of the bases of the IBrj, which occupy one-half of the total 

 length, and their distal lateral angles are somewhat produced and broadly rounded. 



The radianal, which has not undergone appreciable reduction in size, is situ- 

 ated on the distal border of the radial ring. It adjoins the left side of the base 

 of the right posterior radial, reaching thence to just beyond the posterior inter- 

 radial suture. 



There are no traces of interradials. 



The arms consist of about 12 brachials, each with a pair of sacculi and large 

 covering plates. 



No resorption of the orals appears to have taken place, but they are relatively 

 much smaller than previously, and their bases are separated from the distal 

 borders of the radials by a considerable area of naked perisome. 



No. 39 (figs. 929, 930, p. 549) : Dredged on December 31, 1902, in 385 meters. 



The proximal portion of a column, showing the interradial enlargement of 

 the proximal columnal. 



No. 40 (figs. 931-933, p. 549) : Dredged on September 1, 1902, in 385 meters. 



