2o6 DISCOVERY REPORTS 



Some of the arms are broken ; others are of three brachials curhng in over the apices 

 of the oral plates (which appear to be in contact). 



8. Length of crown 1-4 mm. (Fig. 21 e); length of column 77 mm. 



There are 31 columnals and a small thick round terminal plate. The first five 

 columnals are short and discoidal. The first is as wide as the base of the basal cup, the 

 second is as wide but a little longer, the third resembles the first ; all three are a little 

 irregular. The fourth and fifth are narrower, shorter and more regular. The remainder, 

 but for three or four following the discoidal segments and three or four adjoining the 

 terminal plate, are considerably longer than broad — nearly one and a half times as long 

 as broad. They are in other ways similar to those of the earlier stages described in this 

 series; the median girdle is very faint and does not project. 



The sides of the basi-radial cup are nearly straight. The radials almost meet in all 

 interradii except the posterior where they are widely separated by the radianal. The radi- 

 anal still causes a strong asymmetry in the right posterior radial ; it is also in "contact with 

 the left posterior radial. It rests on the posterior oral. The anterior arms are of four 

 brachials and curl in over the orals. No other ossicles than the costals remain on the 

 posterior radials: that on the left is smaller than that on the right. The orals rest against 

 the lower edges of the costals ; they turn in under the axillaries and brachials and where 

 the latter are lost it may be seen that the edges of the orals are in contact (Fig. 21 e). 

 They are strongly everted. 



9. Length of crown 27 mm. (Fig. 22 a-c); length of column 9 mm. 



The stem is of 30 columnals and a round and simple terminal plate. The first five 

 segments are short and irregularly discoidal. The first three are wider and slightly longer 

 than the fourth and fifth. The sixth is longer, but broader than long; the seventh is 

 almost as long as broad, the eighth longer than broad. The ninth to about the sixteenth 

 are considerably longer, nearly twice as long as broad. The remainder gradually decrease 

 in length, the last two or three being shorter than broad. Most of the longer segments 

 have a very faint median girdle which does not project. 



The sides of the basi-radial cup are straight. The radials, with the exception of the 

 posterior pair, are in broad contact with one another. The posterior are separated by 

 the radianal which lies in the midline of the posterior interradius, in contact with both 

 radials and making each of them equally asymmetrical : whereas the other radials are 

 seven-sided they each have six sides. The radianal rests on the posterior oral and ex- 

 tends as far forward as the distal edges of the radials. The orals, which are in contact 

 with the inner distal edges of the radials, are broad plates with the lateral edges of the 

 distal portion, which bends strongly in over the disk, strongly everted and in contact 

 with one another. 



The arms are of ten or eleven brachials. I can see no sacculi and side-plates along 

 the ambulacra. There are no pinnules. 



10. Length of crown 3-2 mm. ; length of column 10 mm. 



There are 34 columnals in the stem which is similar to that of No. 9. There are six 

 short irregularly discoidal proximal columnals. The first is very short and closely 



