550 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



The column consists of 40 segments, of which the first six are short and 

 discoidal, and a terminal stem plate. The terminal stem plate is in the form 

 of five long digitiform processes and resembles an Henricia sanguinolenta. 



The radials are nearly of the same height as the basals, and the radial ring 

 is peculiar in that its distal border, as the calyx is viewed from the side, is prac- 

 tically a straight line. 



The radianal is entirely excluded from the radial circlet and lies above and 

 mostly to the right of the posterior interradial suture. The right posterior radial 

 is now symmetrical, but in the posterior interradius the distal border of the radial 

 circlet, instead of being a straight line as in the other interradii, forms an obtuse 

 angle. 



Between the posterior radials there is a very narrow plate which, arising 

 from the narrowly truncated distal apex of the posterior basal, entirely separates 

 them. 



In another interradial area a narrow wedge-shaped plate, arising similarly 

 from the blunted distal apex of the basal, extends distally l)etween the radials 

 for about two-thirds of the distance to the distal border of the radial circlet. 



In a third interradial area a circular inclusion over about the median third 

 of the interradial suture shows the beginning of another interradial. 



These interradials, growing very rapidly, come eventiuiliy to form the so-called 

 interradial radials, from which division series arise which are indistinguishable 

 from those on the radial (primary) radials. 



There are 7 brachials, each with a pair of sacculi and large covering plates. 



No. 41 (figs. 934-936, p. 549) : Dredged on January 30, 1903, in 380 metere. 



The first 12 columnals (which are all that remain) are very short and discoidal. 

 The first two are very closely united. The topmost is rather longer than those 

 following and bears narrow processes extending into the bases of the basals. 



The radials are about as long in the median line as the interbasal sutures. 

 The bases of the IBr^ occupy almost their entire distal border. 



In one interradial area the radials are separated by two interradials, side 

 by side, similar in size and shajDe, the two together being about equivalent to 

 a normal single interradial. 



In the other four interradii the radials are separated by interradials which 

 are about two-thirds as broad and about two-thirds as long as the adjacent radials, 

 resting upon the broadly truncated and slightly concave distal angles of the basals. 



These interradials bear on the middle third of their distal margin inter- 

 radial IBr, which exactly resemble the radial (primary) IBrj of corresponding 

 size. From their size and shape it is probable that these interradial IBr, were 

 followed by interradial IBr, which have been broken off. 



The radianal, easily distinguished from the other plates by its much finer 

 structure, is evidently undergoing re.sorption, as it has become narrow and leaflike, 

 and a small calcareous plate just beyond its distal border appears to be a portion 

 which has become separated from the main mass. 



There were probably six or eight brachials following the radial IBr series. 



