Sentences with phrase «thickened outer lip»
The aperture runs the length of the shell and the thickened outer lip parallels the coiled shell.
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The outer lip flares more at the base than the top and is thickened with small but distinct teeth on the inner margin.
The outer lip is not thickened at all and there is a siphonal notch at the base of the lip.
The aperture extends the length of the shell, and the outer lip is thickened.
Shell small, elongate, pellucid white, exhibiting the red dried remains of the animal, smooth, glossy, rather blunt at the apex; whorls 8, a little convex, slowly and regularly increasing, narrowly marginate beneath the slightly oblique suture; aperture ovate, acuminate above; peristome whitish, the outer margin curved forward in the middle, somewhat sinuated above and at the base; columellar margin thickened, reflexed, joined above to the outer lip by a thin callosity.