| At dusk bunches of these tireless birds rise so high that they become mere crescentic specks in the darkening sky. |
| However, an important difference is in the shape of the crescentic facets on the proximal edge of the marginals. |
| Two crescentic rows of ciliated papillae lie in the transverse plane on each side of the sense-organ. |
| The sense of movement was derived from rat tails, crescentic features, chattermarks and roches moutonnées, and from stoss and lee relations. |
| On the left-hand side of the carapace, a thin crescentic ridge marks the position of one of the paired lateral eyes. |
| The crescentic extension above what is apparently the head occurs in many bird figures and may represent a beak. |
