Plate 5. 



Page. 

 TECHNOCRINUS NIAGARENSIS, new species 14 



Fig. 1, 2. Basal and lateral views of the type; remnants of spines are seen in 

 place, and sockets of others. 



Xiagaran (Bob formation): Hardin County, Tennessee. 



STEREOCRINUS HELDERBERGENSIS, new species 15 



3, 4. Basal and lateral views of type. 



5. Plates of another specimen, showing striate ornamentation. 



Helderbergian (Linden formation): Benton County, Tennessee. 



DOLATOCRINUS LACUS Lyon 2^ 



6. A typical specimen, with characteristic outline: the arms are free on 



second secundibrach. 



7. A larger specimen, with greater incorporation of brachials and more 



pinnule openings. 



DOLATOCRINUS PYRAMIDATUS, new species 29 



8. 9. Lateral and basal views of type, showing the characteristic contour, 



taj)ering upward from broad truncate base involving most of first 

 primibrach and part of interbrachial; pinnule openings are strong. 



10. Basal view of another specimen showing traces of stellate ornament, 



usually removed by erosion. 



11. The Inroad, truncate base of a larger specimen. 



DOLATOCRINUS ROTUNDUS, new species 30 



12. 13. Basal and lateral views of type, showing the rotund contour, with- 



out angles or surface ornament. 



DOLATOCRINUS MARSHI Lyon 31 



14. A typical specimen, with prominent pinnule openings. 



All except Nos. 1-5 from the Onondaga of the Louisville area. 

 64 



