PLATE XLIX. 



Metacrinus costatcts, n. sp. 



Fig. 1. An entire specimen, 



Fig. 2. The calyx of an individual in which basals arc absent, 



Fig. 3. Portion of the stem, .... 



Fig. 4. An iuternodal joint, .... 



Fig. 5. Upper face of a nodal joint, 



Fig. 6. The lower portion of one of the outer pinnules ; from the side, 



Fig. 7. The ambulacral skeleton of one of the lower pinnules; from 

 above, ....... 



15 



364 



