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This is the same variety, with that from Guasco, considered by M. D'Orbigny to be a distinct species from his T. aenigma, and related to T. obsoleta. Plagiostoma and Ammonites, fragments of. It was evident, from the manner in which species were grouped together, that they had lived where now embedded.
Plagiostoma Hoperi, Sowerby. Syn. Lima Hoperi. The Cephalopoda are abundant, among which 40 species of Ammonites are now known, 10 being peculiar to this subdivision, and the rest common to the beds immediately above or below. Ancyloceras spinigerum, d'Orb. Syn. Hamites spiniger, Sowerby. Near Folkestone.
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