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There are also twelve genera of Gasteropods which have yielded 36 species, four of which pass to the Carboniferous group, namely Macrocheilus, Acroculia, Euomphalus, and Murchisonia. Calceola sandalina, Lam. Eifel; also South Devon. a. Ventral valve. b.
Charles Peach was the first to find, in 1854, three or four species of Orthoceras, also the genera Cyrtoceras and Lituites, two species of Murchisonia, a Pleurotomaria, a species of Maclurea, one of Euomphalus, and an Orthis. Several of the species are believed by Mr. Salter to be identical with Lower Silurian fossils of Canada and the United States.
Bembridge limestones, compact cream-coloured limestones alternating with shales and marls, in all of which land-shells are common, especially at Sconce, near Yarmouth, as described by Mr. F. Edwards. One of the bands is filled with a little globular Paludina. Anoplotherium commune. Binstead, Isle of Wight. Planorbis euomphalus, Sowerby. From this formation on the shores of Whitecliff Bay, Dr.
Pleurotomaria carinata, Sowerby. Mountain Limestone. Euomphalus pentangulatus, Sowerby. Mountain Limestone. a. Upper side. b. Lower or umbilical side. c. View showing mouth, which is less pentagonal in older individuals. d. Euomphalus is a characteristic univalve shell of this period.
Now, as none of these last, or the unimuscular bivalves, are fresh-water, we may at once presume a deposit containing any of them to be marine. Planorbis euomphalus, Sowerby; fossil. Limnaea longiscala, Brongniart; fossil. Paludina lenta, Brand.; fossil. Succinea amphibia, Drap. Valvata piscinalis, Mull.; fossil. Physa hypnorum, Linne; recent. Auricula; recent. Melania inquinata, Def.
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