PLATE XXIII. 



Page 



Melocrin'us nobilissimus (Hall) 295 



Fig. 1. The tj-pe specimen. (Amer. Mus. Nat. Hist.) 



2. Diagram showing the arrangement of tlie plates. 



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



Hall.) 



MeLOCRINUS PACHTDACTrLlT.s (Hall) 296 



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



5. The tj-pe specimen of " Jiluviacrmus" 2Mucidact)/lus Hall. (After Hall.) 



Makiaceincs plumosus Hall 284 



6. The type specimen. (After Hall.) 



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



Macrostylocrinus ornatds Hall 286 



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

 8b. One of its radials, enlarged. 

 8c. A poirtion of an arm, enlarged. 



Macrostylocrinus fusibrachiatus Ringueberg 291 



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



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



