. Dangerous marine animals. Marine animals. 52 DANGEROUS MARINE ANIMALS jection on the terminal fang of the valve. A sensory bristle is located on the inside of each valve. Contact with these bristles causes the small muscles at the base of the valve to contract, thus closing the valves and injecting the venom into the skin of the victim. One of the primary functions of pedicellariae is that of defense. When the sea urchin is at rest in calm water, the valves are gener- ally extended, moving slowly about, awaiting prey. When a foreign body comes in contact with them, it is immediately seized.
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. Dangerous marine animals. Marine animals. 52 DANGEROUS MARINE ANIMALS jection on the terminal fang of the valve. A sensory bristle is located on the inside of each valve. Contact with these bristles causes the small muscles at the base of the valve to contract, thus closing the valves and injecting the venom into the skin of the victim. One of the primary functions of pedicellariae is that of defense. When the sea urchin is at rest in calm water, the valves are gener- ally extended, moving slowly about, awaiting prey. When a foreign body comes in contact with them, it is immediately seized. The pedicellariae do not release their hold as long as the object moves, T>. VALVES OR JAWS VALVE MUSCLES VENOM GLAND. 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