PLATE XLIX. 
METACRINUS COSTATUS, N. Sp. 
. An entire specimen, 
. The calyx of an individual in which basals are absent, . 
. Portion of the stem, 
. An internodal joint, 
. Upper face of a nodal joint, 
. The lower portion of one of the outer pinnules ; from the side, 
above, 
. The ambulacral skeleton of one of the lower pinnules; from 
Diam. 
nat. size 
x 2 
x 3 
x 4 
x 4 
<a 
x do 
364 
