Tlie Calceocrinidce, 407 



EXPLANATION OF PLATES X. and XL 



PL. X. 



Fig. \. Castocrinus furcillatus W . R. Billings. 



a. Right side of type specimen. 



h. Left side of same. 

 Fia. 2. Castocrinus riigosus W. R. Billings. 



Type specimen. 

 Fig. 3. Castocrinus bilUngsianus n. sp. 



a. Anterior side of calyx. 



h. Posterior side of same. 



c. Right side of a smaller and nearly complete specimen. 

 Fig. 4. Castocrinus articulosus E. Billings. 



Type specimen. 

 Fig. 5. Castocrinus inequalis E. Billings. 



Type specimen. 

 Fig. 6. Proclivocrinus radiculus Ringueberg. 



a. Type specimen. 



h. Specimen showing bifurcation of anterior arm. 



c. Anterior side of a calyx with portions of arms. 



d. Posterior side of same. 



Fig. 7. Proclivocrinus chrysalis Hall. 



a. Anterior side of a calyx. 



h. Posterior side of same. 

 Fig. 8. Calceocrinus typus n. sp. 



a. Lateral view of type. 



h. Anterior view of same. 

 Fig. 9. Calceocrinus halli n. sp. 



a. Outer side of consolidated basal piece of type specimen. 



b. Inner side of same. 



Fig. 10. Calceocrinus bidentatus n. sp. 



a. Anterior portion of calyx. 



b. Basal portion of same, x 2. 

 Fig. 11. Calceocrinus stigmatus Hall. 



Base of anterior portion of calyx (after Hall) for comparison with 

 the last, X 2. 

 Fig. 12. Calceocrinus contractus n. sp. 



a. Base of an individual. 



b. Anterior part of calyx of another. 

 Fig. 13. Proclivocrinus chrysalis Hall. 



a. View of the vault of Fig. 7, x 5, to show structure. 



b. View of hinge-line of same, x 5, showing elastic ligaments^ 



