A sphere may be osculatory to the surface in every direction at an umbilicus.
Monodonta, no jaws, spire not prominent, no umbilicus, columella toothed.
Cotyledon, a widely distributed genus with about 90 species, is represented in the British Isles by C. Umbilicus, pennywort, or navelwort, which takes its name from the succulent peltate leaves.
C. Umbilicus is a hardy British plant, with queer rounded leaves almost like a tiny mushroom, and greenish-yellow flowers in June.
There are 50 to 100 ventral pleats, from the chin to the umbilicus or slightly beyond the mid line.
umbilical venous catheter A tube used to give access, through the vein, in the umbilicus.