This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...The nervous system is remarkably developed for a larva apparently not in special need of it, being devoid of both the power and opportunity for movement. The nervous system must here be just a morphological reminiscence. It is forming a conspicuous layer below the epidermis in the anterior end (plate xxvi, figure 6), ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...The nervous system is remarkably developed for a larva apparently not in special need of it, being devoid of both the power and opportunity for movement. The nervous system must here be just a morphological reminiscence. It is forming a conspicuous layer below the epidermis in the anterior end (plate xxvi, figure 6), reaching almost as far downwards as to the posterior end of the vestibulary invagination. Ventrally it is more restricted and is seen only below the suctorial disk (plate xxv, figure 1); from here it branches (plate xxv, figure 2) and may then be followed for some distance downwards as a distinct nerve along each side of the vestibulary invagination. The entoderm forms a wide sac with thin walls, with the nuclei arranged in a layer of somewhat varying thickness, in many places even in a single regular layer (plate xxiv, figures 4 to 9; plate xxv, figures 4 to 6). The lumen of the entoderm sac is entirely empty; there is no trace of yolk or inwandering cells in it. The hydrocoel is a half ring, lying in the normal place a little to the left of the vestibulary invagination (plate xxiv, figures 5 and 9; plate xxv, figures 5 and 6). The primary tentacles are just beginning to appear, as indicated by the thickenings of its epithelium seen in plate xxvi, figure 1. Also a slight prolongation towards the parietal canal--not seen in any of the figures, as no section was favorable for showing it--probably indicates the beginning formation of the stone canal. The pore canal is closed (plate xxiv, figure 9; plate xxvi, figure 4). The parietal canal has a long, narrow anterior prolongation (plate xxiv, figure 4; plate xxv, figures 1 to 3). The ccelomic vesicles have assumed their normal position, the left at the posterior, the future oral end, the right at ...
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