EXPLANATION OF PLATES. 
The figures show to the best advantage when examined by means of a reading-lens of 
3 or 4 in. diameter. The usual small pocket-lens is not suitable for this purpose. 
PLATE I. 
Figures about } nat. size. 
Fig. A. Madrepora grandis (p. 42). Palm Island, Great-Barrier Reef. 
Fig. B. Madrepora grandis, small colony (p. 42). Rocky Island, Great-Barrier Reef. 
Fig. C. Madrepora intermedia (p. 31). Maldive Islands. 
PLATE II. 
Madrepora orbicularis (p. 37). Ceylon. 2 nat. size. 
PLATE III. 
Madrepora multicaulis (p. 48). Ceylon. + nat. size. 
PLATE IV. 
Figures about 4 nat. size. 
Fig. A. Madrepora reticulata, upper surface (p. 68). Amirante Islands. 
Fig. B. Madrepora reticulata, lower surface (p. 68). Macclesfield Bank. 
Fig. C. Madrepora complanata (p. 70). Seychelles. 
PLATE V. 
Madrepora clathrata (p. 49). + nat. size. 
PLATE VI. 
Figures about + nat. size. 
Fig. A. Madrepora clathrata (p. 49). ? Western part of the Indian Ocean. 
Fig. B. Madrepora clathrata, young colony (p. 49). Mauritius. 
Fig. C. Madrepora samoensis (p. 143). Samoa. 
PLATE VII. 
Madrepora oligocyathus (p. 69). Mauritius. 2 nat. size. 
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