DESCRIPTION OF PLATES. 



PLATE I. 



1. Catenicella uentricosa, single zooecimn, front and dorsal. 



2. Catenicella ventricosa, geminate pair of zooecia. 



3. Catenicella nobilis, geminate pair of zooecia, front and dorsal. 



4. Catenicella ampla, anterior surface of 7, fenestrate form; 1«, posterior surface 



of same ; ±b, lateral view. 



5. Catenicella ampla, anterior and dorsal view of geminate zooecia of 9, fenestrate 



form. 



6. Catenicella ampla, anterior view of geminate pair of zooecia, 7, fenestrate form. 



7. Catenicella circumcincta, anterior and dorsal views of single zooecium. 



8. Catenicella expansa, single specimen. 



9. Catenicella expansa, geminate pair of zooecia. 



10. Catenicella mamillata, geminate pair of zooecia. 



11. Catenicella mamillata, single zooecium, front and dorsal view. 



12. Catenicella tenuis, geminate pair of zooecia. 



13. Catenicella tenuis, single zooecium. 



11. Catenicella tenuis, variety, single zooecium. 



15. Catenicella pulchella, gemmate pair of zooecia. 



16. Catenicella elongata, geminate pair of zooecia, front and dorsal view. 



17. Catenicella alata, geminate pair of zooecia, front and dorsal view. 



18. Catenicella crux, single zooecium, front and dorsal view. 



19. Catenicella porosa. 



20. Catenicella cribraria, single zooecium, front and dorsal view. 



21. Catenicella kastata, geminate pair of zooecia, front and dorsal view. 



22. Catenicella hastata, another pair of geminate zooecia. 



23. Catenicella hastata, single zooecium. 



24. Catenicella retrocersa, single zooecium, front and dorsal view. 



25. Catenicella marginata, geminate pair of zo<ecia, front and dorsal view. 



26. Catenicella marginata, single zooecium, front and dorsal view. 



27. Catenicella marginata, single zooecium, front and dorsal view. 



28. Catenicella da?dala, geminate pair of zooecia, front and dorsal view. 



29. Catenicella cincta, single zooecium, front and dorsal view. 



30. Catenicella lineata, single zooecium, front and dorsal view. 



31. Catenicella latifrons, geminate pair of zooecia, front and dorsal view. 



W-2 



