retractively

The axial series slants retractively from the posterior suture.

In addition to the spiral sculpture, the whorls are marked by exceedingly fine, decidedly retractively slanting lines of growth.

All of themare marked by very fine, closely spaced, spiral striations and decidedly retractively slanting, fine incremental lines.

The whorls are marked by rather strong, well-rounded axial ribs, which are slightly retractively slanting on the early turns and decidedly so on the later volutions.

They are marked by very strong, decidedly retractively curved, axial ribs, of which 16 occur upon the first, 18 upon the second, and 20 upon the penultimate turn.