. Elements of zoölogy : a textbook. Zoology. SECTION IV. THE CLASS OF ACEPHALA OR LAMELLIBRANCHIATA OR BIVALVES. THE mollusks of this Class seem to have no head, this important part of the animal being but little developed, and wholly concealed within the mantle, and the whole covered with a shell composed of two pieces called valves. The valves are joined together by a hinge, and held FIG. £17. Excurrent orifice. Foot or Locomotive Respiratory orifice. An AcepUal— Fresh-water Mussel. Unio complanatus, Lea, U. S. FIG. Please note that these images are extracted from scanned page
. Elements of zoölogy : a textbook. Zoology. SECTION IV. THE CLASS OF ACEPHALA OR LAMELLIBRANCHIATA OR BIVALVES. THE mollusks of this Class seem to have no head, this important part of the animal being but little developed, and wholly concealed within the mantle, and the whole covered with a shell composed of two pieces called valves. The valves are joined together by a hinge, and held FIG. £17. Excurrent orifice. Foot or Locomotive Respiratory orifice. An AcepUal— Fresh-water Mussel. Unio complanatus, Lea, U. S. FIG. 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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