TAB. VI. 



Fig. 



1. Dentalina Permiana (X 26). 



2. Dentalina Kingii (X 30). 



3. Dentalina Kingii (X 30). A longitudinal section, rather on one side of the 



median line. 



4. Dentahna (?) (X 32). 



5. Textularia Triticum (X 24). Shell seen obhquely. 



6. Textularia cuneiformis (X 34). Shell seen in profile, edge or back view of one 



row of cells being shown. 



7. Serpula (?) pusilla (X 10). Nearly perfect. 



8. — — ,, Part of the outer coil. 



9. — — „ Perfect. 



10. Spirorbis helix, King. Gutta-percha cast of the upper or free side of an impression 



on a Productus horridus ; thrice the natural size. Hum- 

 bleton Hill. 



11. — — Natural cast of the attached side on the same shell as the 



last. 



12. Spirorbis Permianus, King. Upper or free side, thrice the natural size. Byers's 



Quarry. 



13. — — Attached side, thrice the natural size. Byers's Quarry. 



14. Vermilia obscura, JS;?^. Thrice the natural size. Attached to one of the cup-plates 



of Cyailiocrinus ramosus. Tunstall Hill. 



15. Cyathocrinus ramosus, Schlotkeim. Side view of the cup, twice the natural size. 



Tunstall HUl. 



16. — — Basal view of ditto, showing pelvic and costal plates. 



17. — — Articulating surface of scapular plates, enlarged. 



18. — — Diagram showing the plates separated : a, canal; 3, pelvic 



plates ; c, costal plates ; d, modified costal plate ; e, sca- 

 pular plates ;/, supplementary scapular plate; g, super- 

 added scapular plate. 



19. — — Beaded internodes of the column, twice the natural size. 



Tunstall Hill. 



20. — — Plane internodes enlarged, showing attachment-scar of a 



branch. Humbleton Hill. 



21. — — Articulating surface of an intemode (twice the natural size), 



showing the pentagonal canal, &c. 



