| Term | Definition |
| APERTURAL LIP | The most recently formed margin of the aperture; = PERISTOME; see also: HOLOSTOMATE; SIPHONOSTOMATE; see also: INNER APERTURAL LIP; OUTER APERTURAL LIP. | |
| APERTURAL LIP, INNER | [need definition]. See illustration: Composite Gastropod. See also: APERTURAL LIP; OUTER APERTURAL LIP | |
| APERTURAL LIP, OUTER | [need definition]. See illustration: Composite Gastropod. See also: APERTURAL LIP; INNER APERTURAL LIP. | |
| COLUMELLAR LIP | The part of the inner lip, of a gastropod shell, nearest to the axis of coiling, and comprising the visible part of the COLUMELLA. | |
| ELLIPTICAL |
Like an ellipse or flattend oval; see also: ELONGATE ELLIPTICAL. See other bivalve shapes |
|
|
| ELONGATE ELLIPTICAL |
A basically ELLIPTICAL shape that has been elongated; like a flattened oval. See other bivalve shapes. |
|
|
| LIP | The margin of the aperture; the inner lip (= LABIUM) extends from the foot of the columella to the suture and consists of the columellar lip and the parietal lip. The outer lip (= LABRUM) is that part of the aperture farthest from the axis of coiling; see also: PALATAL; PERISTOME. | |
| LIP, COLUMELLAR | The lower portion of the INNER APERTURAL LIP; see also: LIP, PARIETAL. | |
| LIP, FLARED | [need definition]. In the Strombidae… | |
| LIP, INNER | The portion of the apertural margin of a gastropod shell opposite the outer lip and abutting the earliest portion of the body whorl; = LABIUM; the combination of the COLUMELLAR LIP and the PARIETAL LIP. | |
| LIP, OUTER | The outer, distal, growing or leading edge of a gastropod shell; = LABRUM; = PERISTOME. See illustration: Composite Gastropod. See also: OUTER APERTURAL LIP; PALATAL. | |
| LIP, PARIETAL | The upper portion of the inner APERTURAL LIP, which is attached to the subsequent WHORL. | |
| LIP, REFLECTED | [need definition]. | |
| OUTER LIP | [need definition]. | |
| OUTER LIP TOOTH | [need definition]. See: LABIAL TOOTH. See illustration: Composite Gastropod. | |
| SLIPPER SHELL | Gastropods of the genus Crepidula where the underside of the shell has the appearance of a slipper. See also: DECK; DIAPHRAGM. | |
|
| SLIPPER-SHAPED | Resembling a person's slipper, e.g., when viewing an upside-down shell of the genus Crepidula, with the DECK of the shell forming the upper part of the slipper. See other gastropod shapes. | |
|
| SUBELLIPTICAL | [need definition]. See other bivalve shapes. | |
|