PLATE V. 



Heterocrinus {Iocrtnus) Polyxo Hall^ 1866.* 



Page 212. 

 Fig. 1. Lateral view of a specimen with arms, wanting the basal plates. Received 



from S. T. Carley, of Cincinnati. 

 Fig. 2. A more complete specimen, preserving a large portion of the arms, and 



about five inches in length of the column. Received from W. H. Thomas, 



formerly of Cincinnati. 

 Figs. 3, 4. Anterior and posterior views of the body of an older specimen of the 



same species, corresponding more nearly with H. crassus M. & W. 



Collection of U. P. James, Esq. 



F TERIO CRINUS P OS TIC US Jlall, 1871. 



Page 209. 



Fig. 5. Anterior view, natural size, showing the body and arms to beyond the first 



bifurcation. 

 Fig. 6. Posterior view of the specimen fig. 5, enlarged to two diameters, showing 

 the anal area and lower portion of the proboscis. 



POTERIOCRINUS {DenDOCRINUS) CAB UCE US Jlall, 18Q6. 



Page 208. 

 Fig. 7. Lateral view of a specimen preserving a portion of the arms and column. 

 Fig. 8. Antero-lateral view of another individual, preserving a longer portion of 

 the column. Received from J. Kelly O'Neall, of Lebanon, Ohio. 



Heterocrinus juvenis Hall, 1866. 



Page 212. 

 Figs. 9, 10. Two views of the same individual enlarged, showing the body, arms 

 and a part of the column. Received from J. Kelly O'Neall, Esq. 



Heterocrinus simplex Hall. 



Pal.N. Y.,vol. 1,^.280. 

 Fig. 11. Posterior view of a specimen, preserving body and arms, with a few joints 



of the column. 

 Fig. 12. Lateral view of a portion of one of the arms, showing the position of the 



tentacula, which originate from every fourth plate — or upon every 



second plate on the alternate sides of the entire arm, leaving a single 



plate between without tentacula. 



Heter CRINUS constrictus Hall, 1871. 



Page 210. 



Fig. 13. View of the body with arms attached, showing tlie characteristic constric- 

 tion below the base of the arms. 



Fig. 14. A portion of one arm enlarged for comparison with H. simplex, showing 

 two free plates between the tentacula-bearing plates 



* Published by Meek & Worthen ae Heterocj'inus crassus and H. subcrassus. Proceed. Phila. Acad. 

 Nat. Sci., 1865. 



