. A manual of elementary zoology . Zoology. APPENDIX 571 Mussels may easily be found by searching the shallow part of ponds and streams, usually partly buried in the mud. The Freshwater I. Note protrusion of foot, and current through Mussel, siphons (Fig. 220 A). 2<z. Note in side view umbo, lines of growth, position of hinge, ends of shell (Fig. 220 A); in dorsal view, umbo, lines of growth, ligament (Fig. 221). ;^. Fig. -Part of the dorsal side of a swan mussel in which the pericardium has been opened. an., Auricle ; , margin of dorsal siphon ; hinder tips of gills, f
. A manual of elementary zoology . Zoology. APPENDIX 571 Mussels may easily be found by searching the shallow part of ponds and streams, usually partly buried in the mud. The Freshwater I. Note protrusion of foot, and current through Mussel, siphons (Fig. 220 A). 2<z. Note in side view umbo, lines of growth, position of hinge, ends of shell (Fig. 220 A); in dorsal view, umbo, lines of growth, ligament (Fig. 221). ;^. Fig. -Part of the dorsal side of a swan mussel in which the pericardium has been opened. an., Auricle ; , margin of dorsal siphon ; hinder tips of gills, fused to form floor of cloacal chamber ; , posterior adductor muscle ; pr., posterior re- tractor muscle; nn., rectum; , renopericardial opening; v., ventricle; , margin of ventral siphon (opened out by spreading the mantle). Note between the posterior adductor muscles the fusion of the mantle edges for a short distance, roofing in the cloacal chamber just above the dorsal siphon. b. Remove left valve of shell by separating it from edge of mantle and cutting through attachment of adductor muscles (keep edge of scalpel close to shell). Note: mantle lobes, their thick edges, siphons, two adductor, two retractor, and protractor muscles (Fig. 222, left mantle lobe cut away). t. On inside of shell, note: marks of attachment of muscles; pallial line (Fig. 220 B).. 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
Size: 1265px × 1976px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
