204 



DISCOVERY REPORTS 



shorter than the oral cup and its sides are nearly straight. The radials are slightly smaller 

 than in the previous stage. The radianal is similarly placed. Each of the radials, in- 

 cluding the asymmetrical right posterior, bears a costal and an axillary smaller than 

 those of the previous stage. 



There is a strong contrast between the nearly straight-sided basal cup and the oral 

 cup which has a broadly-rounded dome-like profile because of the strongly everted 

 edges of its plates. 



Fig. 21. Pentacrinoid larvae of hornet la hordea. a, crown and column of No. i. b, crown and part of 

 column of No. 2. c, crown and proximal columnals of No. 3. d, same of No. 5. e, same of No. 8. All 

 X 26. 



5. Length of crown 1-2 mm. (Fig. 21 d)\ length of column 5-4 mm. 



The column is of 28 segments and similar to that of the previous stage ; as in that 

 stage the second of the proximal discoidal segments is larger than the others, which are 

 of equal size. The terminal plate is large and irregular. 



The sides of the basal cup are only very slightly convex. Its base is of the same width 

 as the proximal columnal with which it is closely associated. It is about two-thirds as 

 long as its diameter at the basi-oral suture, a little longer than the oral cup. The lateral 



