. The biology of marine animals. Marine animals; Physiology, Comparative. 240 THE BIOLOGY OF MARINE ANIMALS (Fig. ). Perforating the septum are small pores provided with valves and sphincters. Normally the septum lies quiescent with open pores, through which a slight current is maintained by lateral cilia. Several times each minute, however, the septum is lowered slowly, pores are closed, then the septum is quickly lifted, causing water to be expelled through the exhalant siphon and water and food to be sucked in through the inhalant siphon. The food is retained in the infra-septal cavity
. The biology of marine animals. Marine animals; Physiology, Comparative. 240 THE BIOLOGY OF MARINE ANIMALS (Fig. ). Perforating the septum are small pores provided with valves and sphincters. Normally the septum lies quiescent with open pores, through which a slight current is maintained by lateral cilia. Several times each minute, however, the septum is lowered slowly, pores are closed, then the septum is quickly lifted, causing water to be expelled through the exhalant siphon and water and food to be sucked in through the inhalant siphon. The food is retained in the infra-septal cavity by a large valve Foot Byssus groove Valve Anterior palps Tentacles Mouth Poster/ palps. Mantle edge Anterior and posterior branchial sieves. 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 Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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Keywords: ., bookcentury1900, booksubjectmarineanimals, booksubjectphysiology
