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Feet of a half-grown Hyperia Martinezii, n. sp. In the young of the last-mentioned genus the long head is drawn out into a conical point and bears remarkably small eyes; in course of growth, the latter, as in most of the Hyperinae, attain an enormous size, and almost entirely occupy the head, which then appears spherical, etc.
The river Peneus flowed through the entire extent of the country, and near its mouth was the vale of Tempe, the most beautiful valley in Greece, guarded by four strong fortresses. At the southern extremity of the lake Cælas, the largest in Thessaly, was Pheræ, one of the most ancient cities in Greece, and near it was the fountain of Hyperia.
Subsequently I had the wished-for opportunity of tracing the development of a Hyperia which is not uncommon upon Ctenophora, especially Beroe gilva, Eschsch. In this form the feet remain for a very long time, whilst the abdominal appendages grow into powerful natatory organs, and the eyes, which at first seemed to me to be wanting, into large hemispheres.
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