更多univalve例句

1. Some of these are most vivid in their shapes and ray-like markings, particularly the univalve shells.
2. E is Spirorbis, a minute form with a coiled tube, which looks at first sight like a small univalve shell.
3. The snail proper bears a typical univalve shell: though in its relatives (the slugs), the shell is more or less suppressed.
4. The lid is not, however, like the tongue-ribbon, an essential feature of the structure of every univalve mollusc.
5. The anterior of a spiral univalve is that part of the outer lip which is at the greatest distance from the apex.