. A manual of elementary zoology . Zoology. 314 MANUAL OF ELEMENTARY ZOOLOGY of flaps which hang down on each side of the body. One pair is large, extends from the hind end along the greater part of the length of the animal, and consists of the gills. The other is smaller, lies in front of the gills, and is known as the labial palps. The foot is a compressed structure, with a point directed forwards, lying under the front half of the body. Its lower part is muscular, its g'e n. ; I-ml. , 1. > Fig. 223.—A swan mussel removed from its shell and lying on its right sid
. A manual of elementary zoology . Zoology. 314 MANUAL OF ELEMENTARY ZOOLOGY of flaps which hang down on each side of the body. One pair is large, extends from the hind end along the greater part of the length of the animal, and consists of the gills. The other is smaller, lies in front of the gills, and is known as the labial palps. The foot is a compressed structure, with a point directed forwards, lying under the front half of the body. Its lower part is muscular, its g'e n. ; I-ml. , 1. > Fig. 223.—A swan mussel removed from its shell and lying on its right side with the left mantle lobe and left gills turned back. A portion of the inner lamella of the left inner gill has been cut away to show the openings of the kidney and gonad. , Anterior adductor muscle ; , dorsal siphon ;_A, foot ; gen., opening of the duct of the gonad ; , opening of the kidney ; ~., left inner gill ; /.«//., left mantle lobe; ;., left outer gill; /./.. labial palps; ~., right inner gill; , fight mantle lobe; , thickened edge of the same; , right outer gill ; , ventral siphon. upper part soft, containing the genital organs and intestine. It is thrust out between the valves by the forcing of blood into the sinuses which it contains, and withdrawn by the removal of the blood by the action of its muscles. In locomotion it is wedged into the mud or between stones, and the body is then drawn forwards upon it by the retractor muscles. Above the foot, between it and the anterior adductor muscle, lies the mouth, bordered by upper and lower lips. At the sides of the mouth these lips. 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 Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
