umbilicated

Shell flattened, umbilicated; foot anteriorly truncated with angles produced into lobes.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" by Various

Shell turrited, smooth, polished, umbilicated, base truncated, emarginate.

From Zoological Illustrations, Volume III or Original Figures and Descriptions of New, Rare, or Interesting Animals by William Swainson

Cyclophorus, shell umbilicated, with a short spire and horny operculum.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" by Various

Shell oval, whitish, banded with orange lines; spire obsolete, umbilicated; pillar 6 plaited.

From Zoological Illustrations, Volume II or Original Figures and Descriptions of New, Rare, or Interesting Animals by William Swainson

When fully developed they are somewhat flattened and umbilicated, with a central, darkish point representing the mouth of the follicle.

From Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine by Henry Weightman Stelwagon