DISCOVERY OF THE DISK OF ONYCHOCRINUS 523 



Fig. 5. — Ibid. Basal view of another specimen, with column ossicle attached; 

 no basal whatever visible. 



Fig. 6. — Ibid. Basal view of another specimen; the infrabasals enveloping 

 basals, radials, and part of first primibrachs. Part of the infrabasals have been re- 

 moved, exposing the other plates beneath them, by which their relative positions and 

 proportions can be seen. 



Fig. 7. — C. fimbriatus, supra. Posterior view of crown with two column ossicles 

 attached; from original to Angelin, XXIX, 'j'jb. 



Fig. 8. — Ibid. Left anterior radial view of base of same specimen; to show rela- 

 tive proportions of infrabasals and basals. 



HoMALOCRiNUS AngeHn 



Fig. 9. — H. parabasalis Ang. Upper Silurian, Gotland, Sweden. Posterior 

 view of crown, from original to Angelin, XVI, 29; the very small radianal is visible, 

 directly under the right posterior radial. 



Fig. id. — Ibid. Right posterior radial view of base of same specimen; showing 

 radianal more distinctly. X2. 



Fig. II. — Ibid. Basal view of same specimen, showing basals visible all around; 

 radianal cannot be seen in this view. Nat. 



Fig. 12. — H. dudleyensis n. sp. Upper Silurian. Dudley, England. Posterior 

 view of crown, showing radianal directly under right posterior radial. X2. 



Fig. 13. — Ibid. Basal view of same specimen. Nat. 



Mespilocrinus de Koninck and Lehon 

 Fig. 14. — M. forbesianus de Kon. and Leh. L. Carboniferous, Belgium. Pos- 

 terior view; no radianal. (After de Kon. and Leh.) 



Temnocrinus Springer 

 Fig. 15. — T. tuberculatus Miller. Upper Silurian, Dudley, England. Posterior 

 view of crown; radianal in primitive position as inferradial at base of right posterior 

 ray. 



Gnorimocrinus Wachsmuth and Springer 



Fig. 16. — Gil. expansus Ang. Upper Silurian, Gotland, Sweden. Posterior 

 view, from original to Angelin, XX, 16; anals in tubelike series; radianal obliquely 

 under right posterior radial. 



Taxocrinus Phillips 



Fig. 17. — T. shumardianus Hall. Lower Carboniferous, Alabama. Posterior 

 view; no radianal; anals in tubelike series, bordered by integument of small plates. 



Sagenocrintjs Austin 



Fig. 18. — S. expansus Phill. Upper Silurian, Dudley, England. Basal view 

 of a large specimen; radianal within the ring of basals and resting on the infrabasals; 

 anal interredius perfectly filled with solid plates. 



Fig 19. — Ibid. Right posterior view of smaller specimen. 



Forbesiocrinus de Koninck and Lehon 

 Fig. 20. — F. Washingtonensis M. and G. L. Carboniferous, Indiana. Basal 

 view of calyx; no radianal, and anal interradius perfectly filled with solid plates. 

 The infrabasals are wanting in the specimen, having been detached with the stem, 

 and fused with the proximal columnar. 



(Figs. I, 2, 7, 9, ID, II, and 16 after Liljevall.) 



