36 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 76 



Pl-^TE 3 PAGE 



Catillocrinus wachsmuthi Meek and Worthen 26 



Fig. I. A nearly complete crown, with proximal enlargement of stem; 

 from right anterior radius ; the great length of the slender arms 

 is shown, and the anal tube is exposed near the distal end. 



2. A crown with 39 arms very perfectly preserved to nearly half 



their probable height, and exposing the massive tube ; right 

 posterior view, showing the elongated, pointed anal plate sur- 

 mounting the raised process on r. post. R. X 2. 



3. Cross section at fractured distal end of same specimen, showing 



the massive crescentic tube surrounded by the delicate arms. 

 X2. 



4. A specimen in which the tube has been exposed from its origin, 



somewhat displaced at the base; left posterior view, showing 

 in side view the anal plate interlocked with the lower tube plate, 

 followed by a narrow, keel like projection. X 2. 



5. Posterior view of part of same, showing relation of the narrow 



anal plate to adjoining structures. X 2. 



6. A smaller specimen with 24 arms ; posterior view showing elongate 



anal plate in position. X 2. 



7. Basal view of same specimen, showing three well-defined interbasal 



sutures meeting at the axial canal. X 2. 



8. Posterior view of another specimen with about 25 arms ; stem 



omitted. X 2. 



9. 10. Left anterior and basal views of calyx of a fractured specimen 



in which one basal plate is detached at its bounding sutures, and 

 the suture between the other two is distinct, showing be- 

 yond question the division of the base in this species into three 

 plates. X 2. 



11. Diagram of calyx constructed from the foregoing specimen. 



All Mississippian, Upper Burlington limestone; Burlington, 

 Iowa. 



Catillocrinus shumardi n. sp 27 



12. A crown with nearly complete arms, anterior view. X 2. 



13. Right posterior view of another specimen ; has raised process 



on r. post. R, and three interbasal sutures — not well shown in the 

 figure. X 2. 



Mississippian, Keokuk limestone, lower horizon ; Indian Creek, 



Indiana. 



