| Term | Definition |
| ANAL NOTCH | A break in the circumference of the aperature over the spot where the outgoing current leaves the mantle cavity on the right; i.e., a notch in the outer lip where it joins the body whorl (present in mesogastropods, especially in the Turridae [the "TURRID NOTCH"]). See illustration: Composite Gastropod. | |
| BYSSAL NOTCH |
Indentation below anterior auricle of right valve in many Pectinacea for passage of the byssus or protrusion of the foot. See illustration: Composite Bivalve. See also: BYSSAL FORAMEN; BYSSAL GAPE; BYSSAL SINUS.
See: Bivalve terminology, Anatomy of bivalves by Marlo Krisberg. |
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| NOTCH | An indentation on the margin of a structure; see also: EMARGINATE; STROMBOID NOTCH; TURRID NOTCH. | |
| SIPHONAL NOTCH | [need definition]... See also: SIPHONOSTOMATE. | |
| STROMBOID NOTCH |
A sinuation in the outer lip of shells of the family Strombidae, or a similar situation in other gastropod shells; see also: TURRID NOTCH. Photo: Strombus raninus Gmelin, 1791 For another labelled photo, see the site: Seashells of New South Wales |
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| TURRID NOTCH |
An ANAL NOTCH, or a break in the wall of the outer lip where it joins the BODY WHORL; see also: STROMBOID NOTCH. Photo: Pyrgocythara plicosa (C.B. Adams, 1850) |
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