. Bulletin. Geology -- Connecticut; Animals -- Connecticut; Plants -- Connecticut. 102 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. covered with vibrating cilia, and the embryo swims round and round within the egg membrane. This membrane soon bursts, and the free-swimming blastula rises from the sea bottom to swim at the surface of the Fig. 16. Free-swimming larva (pluteus) of the purple sea-urchin, Arbacia punctulata. The deeply shaded portions represent the cal- careous skeletal rods in the four pairs of The primitive mouth, stomach, and arms. intestine occupy the central portions
. Bulletin. Geology -- Connecticut; Animals -- Connecticut; Plants -- Connecticut. 102 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. covered with vibrating cilia, and the embryo swims round and round within the egg membrane. This membrane soon bursts, and the free-swimming blastula rises from the sea bottom to swim at the surface of the Fig. 16. Free-swimming larva (pluteus) of the purple sea-urchin, Arbacia punctulata. The deeply shaded portions represent the cal- careous skeletal rods in the four pairs of The primitive mouth, stomach, and arms. intestine occupy the central portions of the body. (After Weysse.) After an infolding of the cells on one side to form a mouth and a primitive alimentary canal, a complicated series of changes in the embryo occurs. It finally assumes the shape of a helmet, with long projecting arms, and bands of very long cilia. It now swims freely about, usually in company with millions of others, and begins to feed upon the minute organisms living at the surface of the sea. The embryo, or larva, is now bilaterally. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original State Geological and Natural History Survey of Connecticut. [Hartford] : The Survey
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