PLATE II. 



Diam. 



Fig. 1. TraB.sverse section of Celhtria aitstralis, MacGillivray ; showiiif; the oiiercula in situ, and also the distal 



rosette plates, . . . . . . • . ■ ■ . x 25 



Fig. 2. CMaria aiistralis, MacGillivray ; section of operculum as seen in fig. 1, showing the iIliiIIcIcs in the 

 sockets, ............ 



Fi". 3. Cdlaria australis, MacGillivray ; di^tal rosette plates, ....... 



Fig. 4. CMaria australin, MacGillivray ; outer membranous layer decalcified, showing operculum and ovi- 



cellular cover in situ, 

 Fig. 5. Cdlaria riyida, MacGillivray; section showing the denticle^, an ovicell, and the pore tubes, . 

 Fig. 6. Cellaria riyida, MacGillivray ; longitudinal calcareous section at a lower level than fig. 7, 

 Fig. 7. Cellaria riyida, MacGillivray; longitudinal calcareous section cut near the surface showing the pores. 

 Fig. 8. Poriaa coronata, Eeuss (sent as Myriozoum australiense by Haswell from Holborn Island) ; section 

 showing the ovicells, .......... 



Fig. 9. AdeoyuUa jiolymorpha, Bu.sk ; young cells, the lower one sliowing the commencement of the bridge, . 

 Fig. 10. Adeoaellic polyniorjihu, JjWiik ; o"vicelligerous cell with double pore, ..... 



Fig. 11. Adeonella polyrnorpha, Hwi^k ; with bridge forming a peristomial pore, ..... 



Fig. 12. Thalamopordla labiata, Busk ; calcareous section diagonally through a zocecium, thus showing the pro- 

 jecting rosette plates, . . . . . . . . ■ . x 25 



Fig. 13. Thalamopordla labiata, Busk ; diagrammatical .section showing the position of the rosette plates. 

 Fig. 14. Thalamopordla labiata, Busk ; transverse section, ....... 



Fig. 15. Thalamopordla labiata. Busk ; section through the rosette plate, ..... 



Fig. 16. Monopordla capcuse. Busk ; .^liow ing lamina for the muscular attachments and also distal lotette plates. 

 Fig. 17. Monojiiirdla capcnse, Busk ; distal rosette plate, ........ 



Fig. 18. Mdicuita atluntica,'Bu>^k ; longitudinal section showing the position of the ovicell, 



Fig. 19. Meliccrita dubia, Busk ; diagrammatic transverse section, ....... 



Fig. 20. Adeondla atlantica, Busk ; longitudinal section sliowing the position of the peristomial pore, . 



Fig. 21. Sdiizopordla jjolymorjihajjjusk, .......... 



Fig. 22. Sdthopordkt pohjmorplm, Busk ; section .showing the peristomial aperture, with the operculum in situ, 

 and also an ovicell in section, ......... 



Fig. 23. Schi::02mrdla polymorpha, Busk ; diagrammatic longitudinal section, ..... 



Fig. 24. Sdiizoporella piolyriiorpha, 'Busk ; operculum, ........ 



Fig. 25. Sdmoporella dialLnyeria, n. n. ; .showing the position of the operculum and a cavity below the 

 peristome (probably an ovicell), ......... 



Fig. 26. Sdiizoporella challenyeria, 11. ti.; diagrammatic section of zoariuni, ..... 



Fig. 27. Hdiizopjordla chcdhnyeria, n. n.; section through the peristomial aperture, showing the tube leading 

 to the avicularium, ........... 



Fig. 28. Schizoporella diallenyeria, n. n.; operculuio, ........ 



Fig. 29. Membranipora tubiyera, Busk ; transverse section, ....... 



Fi". 30. Membranipora tubiyera, Busk ; longitudinal section showing avicularian chamber and rosette plates, . 



Fig. 31. Bifaxaria dcnticulaia, Busk ; longitudinal section showing the ovicell above the oral aperture, 



Fig. 32. Steyanoporella neozelanica, Busk ; longitudinal section, ..... 



Fig. 33. Thalamopordla labiata. Busk ; longitudinal section, ..... 



Fig. 34. Micropora impressa, Moll ; longitudinal section, from Naples, .... 



Fig. 35. Adcondl {?) regularis. Busk ; operculum, ...... 



Fig. 36. Adeondla polystomella, Eeuss ; operculum, ...... 



Fig. 37. Adeonella atlantica, Busk ; operculum, ....... 



Fig. 38. Adeonella 2'latalea, Bvisk ; operculum, ....... 



Fig. 39. Adeonella intricaria, Busk ; operculum, ....... 



Fig. 40. Adeonella polymorpha, Busk ; operculum, ...... 



