2 i8 
SMITHSONIAN INSTITUTION 
PLATE 23 
(All figures double size unless otherwise stated) 
Pisocrinus gemmiformis S. A. Miller 
Fig. I. A characteristic specimen, with short arms complete ; 1 . post. view. 
2, 3. Calyx of mature specimens, radianal and ant. views. Note the wide facets, low rectan- 
gular processes, convex base with small indented cavity for column facet. 
4, 4a. Basal and ventral views of similar specimen. 
4h,4c. Details of radial facet of same, seen from side and above. X 8. 
5, 5a. Radianal and ventral views of average specimen. 
6, 6a. Similar views of smaller specimen. 
7, 7a. Basal and ventral views of minimum specimen. 
8. Ventral view of small specimen, with oral plates and first arm brachials in place; photo- 
graph unretouched. 
8a. The same further enlarged, with structures brought out plainer by the artist. X 4- 
All from Laurel formation ; St. Paul, Indiana. 
Pisocrinus baccula S. A. Miller 
Fig. g. Mature specimen with arms complete, ant. view. 
10, loa. L. ant. and basal views of mature calyx. 
11, iia, iib. Radianal, basal and ventral views of large specimen. 
lie, iid. Details of radial facet and processes of same, seen from side and above. X 8. Note 
smaller facets, large lance-head processes, broad, concave base and cavity. 
12, I2a, 13. Ant. and ventral views of sim.ilar mature specimens. 
14, 140, 14b. Post., basal and ventral views of smaller specimen. 
15. 15a, isb. L. ant., basal and ventral views of minimum specimen. 
Laurel formation ; St. Paul, Indiana. 
Pisocrinus quinquelobus Bather 
Fig. 16. A typical specimen, with complete arms, and long stem; 1. post. view. 
17, 18, 19. L. ant., r. ant. and r. post, views of a series of nearly complete crowns, showing the 
general character of arms, facets and processes. 
20. One of the types of P. milliganae M. and G., r. post. view. 
21, 22, 22a, 22b. L. post., 1 . ant., dorsal and ventral views of calyx of mature specimens. 
22c, 22d. Details of radial facets and processes. X 4- Note the relatively small facets, large 
processes, truncate base, minute basals hidden in deeply indented cavity — all with the 
strongly lobate form. 
23. Ant. view of mature specimen with unusually wide facets. 
24, 24a, 24h. R. ant., dorsal and ventral views of mature specimens. 
25. Dorsal view of smaller specimen. 
26, 26a. R. post, and ventral views of very small specimen. 
27,28. Post, and ventral views of large specimen from Jack’s Branch, Perry County, Ten- 
nessee, probably Lobelville formation. 
29. A calyx vertically fractured, showing in section the size of the minute basals. 
All except Nos. 27, 28 from Beech River formation; Decatur County, Tennessee. 
Pisocrinus sphericus Rowley 
Fig. 30. Complete crown, with very short arms. Decatur County. 
31,31a, 3ih. Ant., dorsal, and ventral views of mature calyx from Rise Mill. 
32,33. L. post, and ventral views of similar specimens, from Rise Mill. 
34, 34a, Similar specimen. R. ant. and ventral views, from Rise Mill. 
35. 35®- Radianal and dorsal views of specimen from Flatwoods. 
36. Smaller specimen, but with perfectly round calyx. Flatwoods. 
Top of Beech River; Ri.se Mill, Perry County; also Decatur and Wayne counties, 
Tennessee. 
Pisocrinus granulosus Rowley 
F1GS.37, 38. Ant. and ventral views of large calyx, with tubercular surface. 
39, 39a. R. post, and basal views of smaller specimen. Note the good-sized basals combined 
with the rounded form and other characters like the preceding species. 
In red shales, Dixon, below Beech River formation ; Decatur County, Tennessee. 
