Elements of zoölogy a Elements of zoölogy : a textbook elementsofzolo00tenn Year: c1875 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 Organ. Respiratory orifice. An AcepUal— Fresh-water Mussel. Unio complanatus, Lea, U. S. FIG. 618.

---

Size: 1864px × 1073px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage