The umbilical depression is excavated, nacreous, iridescent, and surrounded by slight concentric grooves.
The cap margin is even, and has slight grooves that mark the position of the gills underneath.
The stem is solid (i.e., not hollow), and has a dry surface with slight longitudinal grooves.
The outlines of the intended figures were drawn either with a blunt scraper, leaving a slight groove, or with charcoal, which would disappear entirely during firing.
Petrie says that he made 220 measurements, and records slight grooves across the neck, and from the shoulders down to the armpits.
The columellar lip is straight, a little thickened and reverted, so as to leave a slight groove behind it.
The slender petioles are usually at least 3 centimeters long and have a slight adaxial groove.
It is dark brown with evident spiral ribs, slight longitudinal grooves and a horny operculum.
Their nests are quite simple, usually just a slight groove in the ground surrounded with plant material in a simple manner.
Like tuned finger cymbals, crotales are thicker and larger; they also have slight grooves in them which give their sound more "sparkle."
