PLATE LXXII. 



Page 



Platycrinus regalis Hall 710 



Tig. 1. Specimen with arms, stem, and root. The calyx of this specimen is much 

 distorted by pressure, and the surface ornamentation obscure, so that in 

 some of the characters it gives an incorrect impression, and does not 

 represent a typical example of the species. (Coll. W. and Sp.) 



2. The type specimen. (Mus. Comp. Zool.) 



Eucladocrinus tuberosus (Hall) 728 



3. Specimen, showing the small branching arms given off from the tubular 



appendages. (Coll. W. and Sp.) 

 4a. Posterior side of the calyx. (Same collection.) 

 ib. Dorsal aspect of the same specimen. 

 4c. Ventral aspect of same. 



Eucladocrinus montanensis Meek 793 



5. The type specimen. (National Museum at Washington.) 



Platycrinus Halli Shumard 6C2 



6a. Specimen with arms and stem. (Coll. W. and Sp.) 

 6b. Portion of an arm, enlarged. 

 7a. Posterior side of the calyx. (Same collection.) 

 lb. Ventral aspect of the same specimen. 



Platycrinus boonyillensis S. A. Miller 681 



8a. The type specimen, showing the dorsal cup. (After Miller.) 

 85. Dorsal aspect of the base. (Coll. W. and Sp.) 



9. Another specimen. (Coll. P. A. Sampson.) 



Platycrinus ornigranulus McCh 701 



10. Basal disk, showing the ornamentation. 



Marsupiocrinus pr^maturus (Hall and Whitf.) 734 



11a. Side view of the type specimen. 



115. Dorsal aspect of the same. (After Hall and Whitfield.) 



