EXPLANATION OF THE PLATES 
NOTE. — Unless otherwise stated, the figures are of the natural size. 
PLATE I. 
Page. 
Traclujpora Wilklnsoyii, Eth. fil. ... ... ... ... 26 
Fig. 1. Portion of a branch showing the distribution of the corallites, and a central 
abortive brancli, x IT 
Fig. 2. Portion of another branch, in which the septal ridges are better defined, x 11. 
Fig. 3. Small part of a coralluin on which the calicos open in a contrary direction from 
opposite ends, x 11. 
Fig. -1. Bifurcating corallum, naturally fractured, showing the corallites in section in the 
centre of the branches, with tabulte in situ ; the calice mouths around the 
periphery separated by the highly-thickened walls, x 2. 
Fig. 5. Small part of Fig. 4 enlarged four times to show these characters more distinctly, 
X 4. 
Fig. G. Another stem naturally fractured, x 2. 
Fig. 7. A stem partially split with the stellate calices admirably shown at the base, x 2^ 
Fig. 8. Portion of a coralluin, from which the whole of tlie calcareous matter has been 
dissolved, leaving the fluted internal casts of the corallites as inverted cones, 
connected liy cross-bars which are the inorganic infilling of the pores of com- 
munication, magnified. 
Figs. 1-6, from Mulbring. 
7, ,, Shoalluiven. 
8, „ Boorook. 
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