A mph i gastrula

Peculiar gastrula of sponges, which in the blastula stage is ciliated on one-half of the ovoid. It is this pole or hemisphere which is invaginated to form the gastrula. A mph i genesis. See ALTERNATION OF GENERATIONS. Amphilestes. One of the earliest marsupial mammals, a jaw and teeth of which have been found in the Stones field slate of the English Jura ic rocks.