The shell was slightly concave, the concavity turned to the front.
And otherwise unlike a volcanic crater is the concavity itself.
It is circular, and is placed on the concavity of the ventral flexure.
Petals numerous, small, 1-lipped, the concavity near the base.
Three, however, had had their concavity partly whittled flat.
The Bee seems to make a point of this concavity, for it serves as a mould to receive the curved bottom of the next cell.
Very shortly a cup-shaped form is assumed, the concavity of which is lined by the more columnar cells.
The iliac crest, extending directly from one spine to the other, is curved, its concavity being turned upwards.
The lateral iliac fossa is the concavity below the overhanging lateral iliac process.
The iliac recess is a concavity dorsolateral to the sharply curving posterior end of the internal ilio-ischiatic crest.