. Dangerous marine animals. Marine animals. SHEATH OF MUSCLE & CONNECTIVE TISSUE. Fig. 24. A venomous aboral spine of the sea urchin, Asthenosoma ijimai. (After Mortensen) of its globe-shaped head, is called the globiferous pedicellariae, and serves as a venom organ. They are comprised of two parts, a ter- minal, swollen, conical head, which is armed with a set of calcareous pincer-like valves or jaws, and a supporting stalk (Fig. 25). The head is attached to the stalk either directly by the muscles, or by a long flexible neck. On the inner side of each valve is found a small elevation pro
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. Dangerous marine animals. Marine animals. SHEATH OF MUSCLE & CONNECTIVE TISSUE. Fig. 24. A venomous aboral spine of the sea urchin, Asthenosoma ijimai. (After Mortensen) of its globe-shaped head, is called the globiferous pedicellariae, and serves as a venom organ. They are comprised of two parts, a ter- minal, swollen, conical head, which is armed with a set of calcareous pincer-like valves or jaws, and a supporting stalk (Fig. 25). The head is attached to the stalk either directly by the muscles, or by a long flexible neck. On the inner side of each valve is found a small elevation provided with fine sensory hairs. Contact with these sensory hairs causes the valves to close instantly. The outer sur- face of each valve is covered by a large gland which in Toxopneustes has two ducts that empty in the vicinity of a small tooth-like pro-. 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 work.. Halstead, Bruce W. Cambridge, Md. , Cornell Maritime Press