Fig. 5. A very elegant and abundant coral (_Caryophyllia annularis_, of Parkinson), in the bed termed "Coral Rag," of the oolite of Wiltshire, Berkshire, &c. Large conglomerated masses of this branched species form a considerable proportion of the fossil coral-reef which traverses some parts of the oolite: and when this bed is worked for road materials, blocks of this coral, more or less changed into calcareous spar, may be seen lying on the way-side. Near Faringdon, in Berkshire, a quarry in the Coral-rag has yielded many beautiful examples. Fig. 7. Called "Spider-stone," by Mr. Parkinson. It is a species of _Astrea_: _d_, is an enlarged view of one of the polype-cells. Fig. 8. A beautiful fossil coral, from Transylvania (apparently a species of Lithostrotion?). Fig. 9. The specimen figured is from the mountain limestone of the Mendip Hills. (It is the _Michelinia tenuisepta_, of Phillips; _Manon favosum_, of Goldfuss?) It is described by Mr. Parkinson as "bearing somewhat of a honeycomb appearance." [Illustration: Plate XXXVIII.] PLATE XXXVIII. Fossil Corals, and Coral Marbles. Fig. 1, is a polished slab of the carboniferous limestone, well known as the Kilkenny marble, and much used for chimney-pieces. The figures exposed on the surface are produced by sections of enclosed corals (some species of Cyathophyllum), which are transmuted into white calcareous spar. Fig. 2. A coral of the same kind (_Cyathophyllum turbinatum_), from the mountain limestone of Derbyshire. Fig. 3. A polished slice of Derbyshire marble, the markings on which are derived from sections of enclosed branches of corals (_Syringopora_), resembling that figured in Pl. XXXIV. Fig. 4. An elegant compound coral, called "Spider-stone" by collectors (_Astrea arachnoides_, of Dr. Fleming); from Wiltshire: the geological habitat uncertain; probably the Oolite. Fig. 5. This specimen appears to be a cluster of corals belonging to the genus Cyathophyllum. Fig. 6. A magnified sketch of one of the cells of fig. 4. Fig. 7. A polished transverse section of a coral; the precise relation of this species is not certain. Fig. 8. This is a very abundant coral in some of the beds of mountain limestone, (_Lithodendron fasciculatum_, of Phillips.) The specimen figured is from Clifton, near Bristol. The marble cups, and other ornaments, manufactured from the rocks near that place, often exhibit sections of this species. Fig. 9. A mass of coral from Ingleborough, (_Cyathophyllum fungites._)