PLATE XXIII. 



Page 

 Meloceinus nobilissimus (Hall) 295 



Fig. 1. The type specimen. (Amer. Mus. 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.) 



Meloceinus pachydactylus (Hall) 296 



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



5. The type specimen of " Marlacrinus" paucidactylus Hall. (After Hall.) 



Maeiacbinus plumosus Hall 284 



6. The type specimen. (After Hall.) 



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



Macbostyloceinus oenatus Hall 286 



8a. The type specimen. (After Hall.) 

 Sb. One of its radials, enlarged. 

 8c. A portion of an arm, enlarged. 



Maceostyloceinus fusibeachiatus Ringueberg 291 



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



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



