2i6 
SMITHSONIAN INSTITUTION 
PLATE 22 
(Figures natural size unless otherwise stated) 
Hormocrinus tennesseensis (Worthen) 66 
Fig. I. Complete crown, with tapering stem formed of bead-like columnals, preserved for full 
length down to fine distal end. 
2. Crown of small specimen, showing full contour with infolding arms. 
2a. Dorsal view of same enlarged, showing base and arrangement of plates ; no RA. X 2. 
2 b. Ventral view of same. X 2. 
3. 3a. L. ant. and r. post, views of another complete crown. 
zb. L. ant. view of same enlarged, showing full details of arms with slender distal ends 
curving down into the interradial spaces. X 2. 
Beech River formation; Decatur County, Tennessee. 
Sagenocrinus clarki Springer 68 
Fig. 4. The type. Flattened crown with stem as it lies in the rock; calyx plates much displaced. 
4a. Restoration from accurate measurements showing exact relation of plates; RA touching 
IBB. 
Beech River formation; Decatur County, Tennessee. 
Sagenocrinus americanus Springer 68 
Fig. 5. Posterior view of t3rpe ; RA not touching IBB. 
Waldron shale; Waldron, Indiana. 
Protaxocrinus robustus Springer 7o 
Figs. 6, 7. Anterior and posterior views of types, showing small plates in interradial areas RA in 
primitive position at base of r. post, ray, and large anal tube following. 
Beech River formation; Decatur County, Tennessee. 
Gnorimocrinus cirrifer Springer 7o 
Fig. 8 . Complete crown, flattened, with long stem showing whorls of cirri; anterior view. 
g. Anterior view of another perfect crown, showing large anal tube, with RA in oblique posi- 
tion at its base. 
10. Dorsal view of smaller specimen, showing IBB and related plates. X 2. 
Beech River formation ; Decatur County, Tennessee. 
Gnorimocrinus varians Springer 70 
Figs. II, iia. Two views of specimen with strong anal tube. 
Beech River formation ; Decatur County, Tennessee. 
Ichthyocrinus subangularis Hall 69 
Fig. 12. R. post, interradial view of crown, showing RA in primitive position at base of r. post. ray. 
13. Oblique view of another specimen, showing base with IBB, and small size of RA com- 
pared with RR in other rays. 
Waldron shale; Waldron, Indiana. 
All figures on this plate are taken from the author’s work on the Crinoidea Flexi- 
bilia, 1920. 
