PLATE LII. 



Metacrinus interruptus, n. sp. 



Diam. Page 

 Fig. ]. An entire specimen, ...... nat. size 367 



Fig. 2. Portion of the stem, . . . . . . x 4 343 



Fig. 3. Face of an internodal joint, . . . . . x 9 368 



A\B. — The sides of this joint are some\Yliat more hollowed than is usually the case. 



Fig. 4. Upper face of a nodal joint, . . . . . x 9 368 



Fig. 5. The termination of the ambulacrum on one of the small outer 



pinnules ; from the side, . . . . . x 1 55 



Fig. 6. Upper view of the ambulacral skeleton nearer the base of the 



pinnule, . . . . , . . x 10 367 



