Title: DEVELOPMENT AND JUVENILE GROWTH OF THE SEA ANEMONE,<i>TEALIA CRASSICORNIS</i>
Abstract: 1. Tealia crassicornis in the Friday Harbor Laboratories was observed to spawn from April to June. The eggs measure 500-700 µ in diameter, and bear surface spines 25 µ in length. 2. The cleavage is superficial, resulting in small cells on the animal pole and large cells on the vegetal pole. 3. Endoderm appears to be formed by multipolar ingression while the central yolk mass remains uncleaved and the formation of the gastrovascular cavity is achieved by absorption of yolk material. 4. The settlement of planula larvae can be facilitated by adding the tubes of the polychaete worms, Phyllochaetopterus or Sabellaria to the culture dishes. 5. A chronology of development is presented and the histogenesis of larval tissue is described. 6. The young anemones have grown to a size of 4 cm in diameter with 60 to 70 tentacles within 18 months when fed in the laboratory. 7. Young anemones can withstand starvation for at least 9 months. There is no growth when starved.