. The chordates. Chordata. \notochord intestine heart B_ METAMORPHOSIS. Fig. 307. Diagrams of stages in the metamorphosis of a urochordate larva. When the larva settles down and becomes fixed by its adhesive papillae, the tail is lost and the notochord disappears. Thus the chordate characters which are so evi- dent in the larva are partly lost in the mature animal. (Redrawn from korscheldt and Heider, after Seeliger. Courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Blakiston Company.). Fig. 308. A tunicate, As- cidia, attached to a stone; seen from right side. Arrows in
. The chordates. Chordata. \notochord intestine heart B_ METAMORPHOSIS. Fig. 307. Diagrams of stages in the metamorphosis of a urochordate larva. When the larva settles down and becomes fixed by its adhesive papillae, the tail is lost and the notochord disappears. Thus the chordate characters which are so evi- dent in the larva are partly lost in the mature animal. (Redrawn from korscheldt and Heider, after Seeliger. Courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Blakiston Company.). Fig. 308. A tunicate, As- cidia, attached to a stone; seen from right side. Arrows indicate the oral (incurrent) and the atrial (excurrent) 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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