. The elementary nervous system. Nervous system; Nervous system -- Coelenterata. 176 THE ELEMENTARY NERVOUS SYSTEM is desirable. Such a form is to be found in Corymorpha palma from the coast of southern California. Corymorpha palma is a beautifully transparent, sol- itary hydroid of slender proportions (Fig. 43). Its stalk measures as much as 10 centimeters or more in length with a diameter at the thickest part of about of a centimeter. Its proximal end is anchored in the mud and its distal end carries a hydranth that when expanded may have a spread of cen- timeters. The proximal porti
. The elementary nervous system. Nervous system; Nervous system -- Coelenterata. 176 THE ELEMENTARY NERVOUS SYSTEM is desirable. Such a form is to be found in Corymorpha palma from the coast of southern California. Corymorpha palma is a beautifully transparent, sol- itary hydroid of slender proportions (Fig. 43). Its stalk measures as much as 10 centimeters or more in length with a diameter at the thickest part of about of a centimeter. Its proximal end is anchored in the mud and its distal end carries a hydranth that when expanded may have a spread of cen- timeters. The proximal portion of the stalk ends in a blunt point and car- ries rows of long filamen- tous bodies, the frustules, by which it is anchored in the mud. This portion of the stalk, often half a cen- timeter or so in length, is commonly turned nearly at right angles to the rest, which is held vertically above the mud. A little above the level at which the stalk emerges from the mud it gains its maximum diameter; distal to this it becomes gradually more and more slender till it reaches a narrow neck, on which the hydranth is borne. The stalk itself is marked by a series of longitudinal canals imbedded in its more peripheral substance and running for the most part. Fio. 43.—Side view of the hydroid Corymorpha, somewhat 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, George Howard, 1864-1955. Philadelphia, London J. B. Lippincott Company
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