The carbonized husks or shells of nuts, and other carpolithes, or seed-vessels, are not unfrequently met with in the coal and coal-shale. In the slab of shale figured, there are three specimens of an oval nut, B, C, which is striated longitudinally. These are associated with other vegetable remains, among which part of a Lepidostrobus, the supposed cone or strobilus of a species of Lepidodendron (see description of Plate IX.), is conspicuous at a. PART II. FOSSIL FAUNA. Plates XXXIV. to LXXIV. inclusive. [Illustration: Plate XXXIV.] PLATE XXXIV. (_Plates XXXIV. to LXXIV. inclusive, are from Parkinson's Organic Remains._) Fossil Tubipore, from Derbyshire. (_Syringopora geniculata_, of Phillips, from the Mountain Limestone, Derbyshire.) The specimen figured is a mass of limestone, on the surface of which is spread out in high relief a delicate tubiporite, or fossil coral, allied to the Tubipora, or "Organ-pipe coral," so generally preserved in cabinets of natural curiosities, from the beauty and elegance of its crimson tubes. The fossil, however, though somewhat resembling the recent coral in its general form, belongs to an extinct genus. This Syringopora appears to have been very abundant in the sea in which the strata of mountain or carboniferous limestone were deposited, for it forms entire beds of great extent. A beautifully figured marble results from this coral, when the interstices of its tubes have been filled up with compact calcareous matter. A small polished slab is represented in fig. 2. At Matlock, vases, and other ornamental articles, are made of it; and the sections of the coral tubes impart considerable variety of figures.[25] [Footnote 25: Articles of this kind may be obtained of Mr. Tennant, 149, Strand.] Some slabs of this fossil coral are of a dull red hue, which there is every reason to conclude is due to the colour of the original; and not only are traces of the natural tints of the living zoophyte preserved, but even the animal membrane of the coral; and this may be exposed by immersing a fragment of the marble in dilute muriatic (hydrochloric) acid. Mr. Parkinson thus describes the result of his first experiment:-- "A fragment of the marble (Plate XXXIV. fig. 2) was exposed to the action of muriatic acid in a very dilute state. As the calcareous earth was dissolved, and the carbonic acid escaped, I was delighted to observe the membranaceous substance appear, depending from the stone in light, flocculent, elastic flakes. Many of these retained a deep red colour, and appeared in a beautiful and distinct manner, although not absolutely retaining the form of the tubipore. A faithful representation of this appearance is given in fig. 3."