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I will reiterate the evidence on the association of these several shells in the several localities. In the same bed, Rio Claro: Pecten Dufreynoyi. Ostrea hemispherica. Terebratula aenigma. Spirifer linguiferoides. Same bed, near Arqueros: Hippurites Chilensis. Gryphaea orientalis.
Professor Forbes adds, that, possibly, internal characters may exist, which would distinguish the American species from its European allies. Spirifer linguiferoides, E. Forbes. M. d'Orbigny considers it as perhaps indicating the Jurassic period. Ammonites, imperfect impression of.
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