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Such carbonic acid, meeting with the protoxide of iron in solution, would unite with it and form a carbonate of iron; and this mingling with fine mud, when the excess of carbonic acid was removed, might form beds or nodules of argillaceous ironstone. Natural size and magnified. b. Natural size and magnified. Goniatites Listeri, Martin. Aviculopecten papyraceus, Goldf.
To this Upper Devonian belong a series of limestones and slates well developed at Petherwyn, in Cornwall, where they have yielded 75 species of fossils. Heliolites porosa, Goldf. sp. Portion of the same magnified. Favosites cervicornis, Blainv. S. Devon, from a polished specimen. a. Cyathophyllum caespitosum, Goldf.; Plymouth and Ilfracombe. b. A terminal star. c.
Outside view of posterior molar, lower jaw: one-third of natural size. Hyaena spelaea, Goldf. Kent's Hole, Torquay, Devonshire; one-third natural size. Teeth of a new species of Arvicola, field-mouse; from the Norwich Crag. Newer Pliocene. a. Grinding surface. b. Side view of the same. c. Geographical Distribution, Form, and Characters of Glacial Drift.
It is much larger than that of any known living species of the same genus. Archegosaurus minor, Goldfuss. Imbricated covering of skin of Archegosaurus medius, Goldf.
Syn. Gorgonia infundibuliformis, Goldf.; Retepora flustracea, Phillips. b. It sometimes attains a large size, single specimens measuring eight inches in width. The same bryozoan, with several other British species, is also found abundantly in the Permian of Germany. Productus horridus, Sowerby. Lingula Crednerii.
The Stringocephalus is also so abundant in the Middle Devonian of the banks of the Rhine as to have suggested the name of Stringocephalus Limestone. Megalodon cucullatus, Sowerby. Eifel; also Bradley, S. Devon. a. The valves united. b. Conularia ornata, D'Arch. and De Vern. Ser. volume 6. Bronteus flabellifer, Goldf. Mid.
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