PLATE VIII. 
Fig. 1. 
Fi-. 2. 
Fig. 4 
Fig. 5, 
Fig. 6 
Fig. 7, 
Zaphrentis arundinaceus, Lonsdale, sp. 
Naturally-fractured section of the corallum, immediately below the calice, showing 
septa, fossula, and small tabulate area, x 4. 
Opposite end of the same specimen, at a depth of three-quarters of an inch, show- 
ing the under-surface of a tabula with the fossula and septa faintly marked 
at the margin, x 
Zaphreyxtis gregoriana, De Koninck 
Fig. 3. Corallum seen from the ventral side. 
„ seen laterally. 
„ of a more robust variety, seen laterally. 
,, „ „ seen ventrally. 
Vertical section of a corallum, showing the base of the calice composed of large 
vesicles, and an upwardly-directed process of the floor. 
Fig. 8. Naturally-fractured transverse section, with a large fossula and central tabulate 
area, x L 
Fig. 9. Transverse section, showing septa, scattered dissepiments, and vesicular base of 
calice, x 2. 
Fig. 10. Portions of five septa, highly enlarged, to show the flexuous primordial septum 
in each. 
Fig. 11. Naturally-weathered calice, x h 
Fig. 12. Naturally-weathered transverse section, in which the whole of the loculi have 
become filled with stereoplasma, x 4. 
Za 2 )hi'entis cainodon, De Koninck... 
Fig. 13. A weathered corallum, side view. 
Fig. 14. Calice and part of corallum, ventral view, showing septa and fossula, x i. 
Fig. 15. Transverse section, showing septa and vesicular base of calice, x 2. 
Fig. 16. Vertical section, showing vesicular base of calice. 
Pigs. 1-1 G from Shoalhaven District. 
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