78 BRY0Z0A FROM SHIPTON GORGE. [Feb. 1 894, 



Plate III. 



All the figures in this Plate are magnified 50 diameters, except fig. 27, 

 which is X 12. 



Fig. 1. Zocecium of Pergensia niclulata, sp. nor. with supra-oral ovicell. 



2. ,, „ ,, with apertural plate. 



3. ti » ,, young. 



4. ,, „ ,, with rostral processes, broken. 



5. ,, Pergensia minima, sp. nov. 



6. ,, ,, „ with supra-oral ovicell. 



7. 8, 9. Zoceoia of „ „ 7 and 8 viewed from different points. 

 10. Zocecium of „ „ with apertural plate. 



11, 12, 13. Zocecia of Pergensia major, sp. nov. 12 and 13 : the same zooecium 



viewed from different points. 



14. Zocecium of „ „ with notched lip. 



15. „ „ „ with mural opening at the back. 

 16. 



17, 18. Apertures of ,, „ 



19. Zocecium of Pergensia galeata, sp. nov. 



20. ,, ,, ,, with tubules. 



21. 22, 23, 24. Zocecia of Pergensia amphoralis, sp. nov. 



27. Pergensia galeata, sp. nov. 



25. Zooecium of Pergensia galeata, with rostral processes and opening. 



26. ,, „ „ like fig. 25, but with basal (ovicell ?) 



opening. 

 29. ,, ,, „ with termination displaced. 



28, 30, 31, 32. Zocecia of Pergensia galeata. 



33. Zocecium of Pergensia galeata, with mural pore. 



Plate IV. 



Figs. 1,2. Zocecia of. Pergensia porifera, sp. nov. X50. 



3. ,, „ „ ' with broken mouth. X50. 



4. Zocecium of „ „ with mural pore. X50. 



5. „ „ ,, with mural pore and cover. XoO. 



6. Zocecia of Pergensia jugata, sp. nov. with clusters of interzocecial tu- 



bules, x 50. 



7. Zocecium of „ „ ,, terminal tubules & mural open- 



ings. X 50. 



8. Ovicell-sac of „ ,, x50. 

 9-13. Zocecia of „ „ x50. 



14. Ovicell-sac of Pergensia jugata, var. bi-gibbosa, nov. x50. 



15. Zooecium of ,, „ „ ,, X50. 



16. Avicularium(?) of Pergensia porifera. X50. 



17. Zocecium of „ „ X 50. 



18. Pergensia jugata. End of zoarium, showing the compressed termination 



of the axial tube. X 25. 



19. „ „ Longitudinal section, showing globose crystalline 



bodies in the cell and the axial tube. X 100. 



20. „ „ Ovicell-sac. X50. 



21. „ „ Longitudinal section, partly cut through and viewed 



as an opaque object, to show the cell-arrangement 

 above the axial tube. X 15. 



Discussion. 



The President said that this was a paper which could be appre- 

 ciated only after it was printed. Great interest attached to it, 

 because the Author described a genus which blends together two 

 sub-orders. 



