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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.
Koninckia Leonhardi, Wissmann. a. Ventral view. Part of ventral valve removed to show the vascular impressions of dorsal valve. b. Interior of dorsal valve, showing spiral processes restored. c. Vertical section of both valves. About 600 species of invertebrate fossils occur in the Hallstadt and St. COLUMN 1: COMMON TO OLDER ROCKS. Orthoceras. Bactrites. Macrocheilus. Loxonema. Holopella.
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