. A manual of zoology. —*han. -din Fig. 83. — Diagram of nervous system of Nematoda. c, com- missures; din, dorsal nerve; /is;/, posterior lateral nerve; on, upper and tin, under portion of nerve-ring; sg, lateral swellings; vln, ventral nerve. (From Lang, after Biitschli.) stomodagum (Fig. 82, //;), with very muscular walls. Posteriorly the pharynx opens into the intestine (in/), a thin walled tube, flattened from above downwards. Posteriorly the intestine narrows considerably to form the short rectum, which opens externally by the anus (an). The food, consisting of the semi- fluid contents o
. A manual of zoology. —*han. -din Fig. 83. — Diagram of nervous system of Nematoda. c, com- missures; din, dorsal nerve; /is;/, posterior lateral nerve; on, upper and tin, under portion of nerve-ring; sg, lateral swellings; vln, ventral nerve. (From Lang, after Biitschli.) stomodagum (Fig. 82, //;), with very muscular walls. Posteriorly the pharynx opens into the intestine (in/), a thin walled tube, flattened from above downwards. Posteriorly the intestine narrows considerably to form the short rectum, which opens externally by the anus (an). The food, consisting of the semi- fluid contents of the intestine of the host, is sucked in by movements of the pharynx, and is then absorbed into the system through the walls of the intestine. The food being already digested by the host, there is no need of digestive gland-cells such as occur in animals which pre- pare their own food for absorption. Between the enteric canal and the body-wall is a distinct space, the ccelome or body-cavity, containing a clear fluid. The excretory system presents a certain resemblance to that of Pla- todes. It consists of two longitu- dinal canals (ex. v), one in ea'ch lateral line. Anteriorly they pass to the ventral surface, unite with one another, and open by the minute excretory pore (ex. p) al- ready noticed. The nervous system consists of a ring (nv. r) surrounding the pharynx. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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