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“Diagrammatic longitudinal section of a Nemertean (Amphiporum lactifloreus), dorsal view. p.p., Proboscis pore; b., brain giving off the lateral nerve-cords (n.); po., oesophageal pocket; p., proboscis lying within its sheath; st., stilet of proboscis; m., retractor muscles of proboscis; g., gut shown in outline at the sides of proboscis; e., the three main, longitudinal blood vessels, which unite both anteriorly and posteriorly.” -Thomson, 1916




J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)


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