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The relations of these species have been given under the head of Coquimbo. Terebratula aenigma, d'Orbigny, "Voyage" Part Pal. This shell M. d'Orbigny does not consider identical with his T. aenigma, but near to T. obsoleta. Professor Forbes thinks that it is certainly a variety of T. aenigma: we shall meet with this variety again at Copiapo. Spirifer Chilensis, E. Forbes.
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.
In illustration of shells having a great vertical range, it may be stated that in England some few species pass up from the Lower to the Upper Oolite, as, for example, Rhynchonella obsoleta, Lithodomus inclusus, Pholadomya ovalis, and Trigonia costata. Ammonites macrocephalus, Schloth. One-third natural size.
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