Del Salvatore, the Megaris of Pliny), now joined to the shore at the foot of the Pizzofalcone by an archsupported causeway, stands the Castel dell' Ovo (so called from its shape, though medieval legend associates the name with the enchanted egg on which the magician Virgil made the safety of the city to depend), which dates from 1154.
In front lie the Villa Communale (first called Reale and subsequently Nazionale) public gardens, the chief promenade of the city, which were first laid out in 1780, and have been successively extended in 1807, in 1834, and again in recent years; and the whole edge of the bay from the Castel dell' Ovo to Mergellina is lined by a massive embankment and carriageway, the Via Caracciolo, constructed in 1875-1881.
He published at Oxford in 1668 two tracts, on respiration and rickets, and in 1674 these were reprinted, the former in an enlarged and corrected form, with three others "De sal-nitro et spiritu nitro - aereo," "De respiratione foetus in utero et ovo," and "De motu musculari et spiritibus animalibus" as Tractatus quinque medico-physici.
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Many lizards, however, retain the eggs in the oviducts until the embryo is fully developed; these species then bring forth living young and are called ovo-viviparous by purists.