PLATE XXIII. 



Page 

 Meloceinus nobilissimus (Hall) 295 



Fig. 1. The type specimen. (Amer. Mas. Nat. Hist.) 



2. Diagram showing the arrangement of the plates. 



3. Portion of one of the radial trunks, showing the origin of the arms. (After 



Hall.) 



Melockinus pachtdactylus (Hall) 296 



4. The structure of the radial trunks and the origin of the arms, (After Hall.) 



5. The type specimen of " Mariacrinus" paucidactyhcs Hall. (After Hall.) 



Maeiackinus plumosus Hall 284 



6. The type specimen. (After Hall.) 



7. Dorsal cup of a larger specimen. (After Hall.) 



Maceosttloceinus oenatus Hall 286 



Sa. The type specimen. (After Hall.) 

 8b. One of its radials, enlarged. 

 8c. A portion of an arm, enlarged. 



Mackostyloceinus fusibrachiatus Eingueberg 291 



9. The type specimen. (Coll. Dr. E. N. S. Ringueberg.) 



10. A smaller, somewhat distorted specimen. (Same collection.) 



