I^S SMITHSONIAN INSTITUTION 



PLATE LXXVI 

 (All figures natural size except where otherwise stated) 



Figs. 1-5. Edriocrinus dispansus Kirk 449 



Fig. I. The t5'pe. Posterior view of calyx ; anal plate projecting above RR. X 1 ■ U. S. Nat. Mus. 



2. Ventral view of another calyx, showing great contraction at arm-bases. X I- 



3. Ventral side of basal disk; showing interbasal sutures and 4 BB; also angular ridges 



between depressions for radial and anal plates. X !• 



4. Dorsal view of rounded basal disk, with indented cicatrix of attachment in younger 



stage. X f . 



5. Dorsal view of another base which has far outgrown the shell to which it was attached. 



Xf. 

 Helderbergian ; Lower Devonian. Benton County, Tennessee. 



Figs. 6-12. Edriocrinus occidentalis n. sp 449 



Figs. 6-9. Silicified specimens from Covington, Virginia, showing different forms and sizes of base. 

 10, II. Similar specimens from Stewart County, Tennessee. Xf. 



12. Transversely fractured base from last locality, showing the position of interbasal sutures 

 replaced by silicious partitions; and of the 4 BB. XI- 

 Helderbergian ; Lower Devonian. Virginia and Tennessee. 



Figs. 13-15. Edriocrinus explicatus n. sp 449 



Fig. 13. Lateral view of base ; calcareous specimen, in which the interbasal sutures are visible at 

 the surface. X I- 

 14-15. Dorsal and distal views of similar bases, showing 4 BB. Xi- 



Helderbergian ; Lower Devonian. Perry County, Tennessee. 



Figs. 16-18. Edriocrinus adhaerens n. sp 451 



Figs. 16-18. Three specimens of bases attached to shells or other objects; showing the expanded 

 lower surface, and the angular ridges (6 in number) between depressions for radials 

 and anal plate. X f • 



Helderbergian ; Lower Devonian. Benton County, Tennessee. 



Figs. 19-21. Edriocrinus pyriformis Hall 451 



Fig. 19. One of the three types used in Hall's description, original of fig. i, p. 115, of the isth 

 Report. Left posterior view of calyx; concave surface of attachment at lower end 

 of basals. Am. Mus. Nat. Hist. 



20. Distal view of another type, showing inward bending of radials at arm bases, and the 



projecting anal plate. Same collection. 



21. Concave lower surface of another base. Same collection. 



Helderbergian ; Lower Devonian. Oneida County, New York. 



Figs. 22, 23. Edriocrinus holopoides n. sp 452 



Fig. 220. Anterior view of complete crown ; showing 4 and 5 IBr, broad low calyx, and encrusting 

 base. XI- 

 22&. Basal view of same, showing course of interbasal sutures between 4 BB. X - • 

 23a. Posterior view of another specimen with 6 IBr, showing projecting anal plate, short arms, 



and narrowness of crown. 

 23&. Basal view of same, showing traces of interbasal sutures. 



Fig. 24. locrinus (" Caleidocrinus ") multiramus (Barrande) 442 



(Also on Plate LXXV, fig. 9) 



Fig. 2a. Posterior view of specimen showing series of anal tube plates originating on left shoulder 

 of axillary r. post, super-radial. The stem proximal to the calyx is pentagonal, but 

 somewhat flattened. Negative photograph of original impression left by decom- 

 position of the fossil. Xt- 



Ordovician. Zahoran, Bohemia. 



All specimens are in the author's collection unless otherwise stated. 



