Plate III. 



Conularia gracilis, Hall. Utica slate, Dolgeville, N. Y. 



Figure 1. Dorsal view of basal appendage. Enlargement of the appendage of the specimen 

 reproduced in Plate II, Figure 1. X 10. 



Figure 2. Vertical section through appendage Whole specimen as found, x 10. 



Figure 3. Nearly vertical section, a, basal ring of exterior bell, seen from inside; b, dorsal part 

 of bell; c, interior cup. X 10. 



Figure 4. Detached specimen of Conularia gracilis, bearing the appendage reproduced by 

 Figure 3. Natural size. 



Figure 5. Underside of appendage, a, base of exterior bell; b, base of interior cup. x 10. 



Figure 6. Ventral view of appendage, only the bases of exterior bell (a) and interior cup (b) 

 being preserved. X 10. 



Figure 7. Ventral view of appendage, a, base of exterior bell; b, base of interior cup. X 10. 



Figure 8. Ventral view of appendage, showing the radial furrows of the base of the exterior bell 

 and the concentric structure of the latter. X 10. 



Figure 9. Lateral view of basal appendage, a, dome of bell ; b, basal ring of bell ; c, impression 

 of base of bell; d, impression of basal skin; e, node in centre, cast of central cup. x 10. 



Figure 10. Interior view of bell from ventral side, shows wrinkled dome of bell and subqua- 

 drangular entrance of pyramid of Conularia. x 10. 



Figure 11. Counterpart of the preceding. Shows the apex of the pyramid, x 10. 



Figure 12. Dorsal view of appendage. Dome of bell broken away, x 10. 



Figure 13. Ventral view of appendage. Shows radial striation of base of bell, x 10. 



Figure 14. Conularia gracilis, Hall, attached to a fragment of Stictoporella. Natural size. 



Figure 15. The same. Basal appendage as found originally, x 8. 



Figure 16. The same. Matrix removed by acetic and hydrofluoric acids, a. interior bell; 

 b, impression of connecting basal skin ; c, impression of central cup. x 8. 



Figure 17. Ventral view of appendage. Exterior bell seen in section. Exhibits apex of 

 pyramid, x 6. 



Figure 18. Ventral view of appendage, a, base of bell; b, base of central cup. x 10. 

 Figure 19. Impression of basal appendage. Junction of two marginal grooves of pyramid 

 preserved, x 10. 



Figure 20. Transversal section through appendage. Shows the four marginal grooves of the 

 shell of Conularia in section. x 10. 



Figure 21. Diagrammatic section through basal appendage. The dotted part is a section 

 through the basal appendage in the state of compression, the striated through the same in the state of 

 attachment, x 10. 



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