PLATE F.— (Continued). 

 Heterocrinus lax us Hall, 1871. 



Page 211. 

 Fig. 15. Lateral view of a specimen, preserving the body and arms. 



Heterocrinus ExiLis Hall, 1866. 



Page 213. 

 Fig. 16. Posterior view of a specimen, enlarged to two diameters. 



. Gl tp to crinus pa r vus Hall, 1871. 



Page 207. 

 Fig. 17. Lateral view of specimen, showing body and arms enlarged. 



Gltptocrinus Nealli Hall, 1866. 



Page 206. 

 Fig. 18. View of a specimen, preserving a part of the body, the interradial areas, 



and the bifurcation of the arms. 

 Fig. 19. View of a specimen, preserving the body and arms to beyond the first 



bifurcation after becoming free. 



