更多trigonal例句

1. Orifice either large and rounded-trigonal, or small and oval, either entire or less frequently toothed.
2. Parietes ribbed, mottled purplish-red; orifice broad, trigonal, hardly toothed.
3. The horns are trigonal, laterally compressed and knotted on the upper edge.
4. When the whorls are angulated, a trigonal aperture is the result, as in many species of Trochus.
5. Mactracea (plates, fig. 77 to 88), the cartilage placed in a trigonal pit, with a small external ligament.