208 



DISCOVERY REPORTS 



and as wide as the base of the basal cup to which it is closely attached. It bears the 

 beginnings of five radially situated cirri, each, except for the left posterior which is broken 

 off, of about three to five segments. The proximal border of the second columnal is 

 deeply notched radially opposite each of the developing cirri. The third to fifth colum- 



Fig. 22. Pentacrinoid larvae of Isometra hordea. a, crown and proximal columnals of No. 9. b, tenth to 

 fourteenth columnals of No. 9. c, last columnals and terminal plate of No. 9. d, proximal portions of crown 

 and column of No. 12. e, same of No. 14. /, same of No. 15. All x 18. 



nals are as short as the first and second; they are irregularly discoidal. The sixth to 

 eighth are longer, the ninth slightly longer than broad. The remainder of the stem is 

 similar to that of No. 1 1 ; none of the columnals has a median girdle. 



The radials are longer than the basals. They are all in broad and complete lateral 

 contact. The right distal corner of the left posterior radial extends farther forwards than 

 the contiguous corner of the right posterior radial ; the radianal plate is in contact with 



