First lesson in zoology : adapted for use in schools . Fia. 76.—Under side oE head of pond-snail, be, mouth open showing the buccalcavity; in the left-hand figure the mouth (m) is closed by the lip (L); j, jaw; Ij,lateral teeth; r, lingual ribbon; t, tentacle. is common under stones and sticks on land, the shell isonly a thin scale on the back, and covered by the skin. Ifthey climb a twig or spear of grass, they let themselvesdown by a slimy thread. In fact, the body is covered with ^r A.

---

Size: 1661px × 1504px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894