The aperture is subquadrate, nacreous, smooth within, and has a groove indicating the place of the external keel.
32.
The opalescent clouds in question were " nacreous clouds, " also known as " mother-of-pearl " clouds.
33.
All have thick nacreous shells with well-developed hinge teeth, many also with external shell sculpturing of nodules or lumps.
34.
Other mollusc families that have a nacreous inner shell layer include marine gastropods such as the Haliotidae, the Trochidae and the Turbinidae.
35.
(Original description by Verrill & Smith ) The small, fragile, white, nacreous shell has a conico-turbinate shape.
36.
The base is the same base color as the body, and the interior of the aperture is thinly nacreous ( pearly ).
37.
The external colour of the shell is often dark blue, blackish, or brown, while the interior is silvery and somewhat nacreous.
38.
Whether wild or cultured, gem-quality pearls are almost always nacreous and iridescent, like the interior of the shell that produces them.
39.
Prionodesmacea have a prismatic and nacreous shell structure, separated mantle lobes, poorly developed siphons, and hinge teeth that are lacking or unspecialized.
40.
However, polar stratospheric or nacreous clouds are occasionally seen in the lower part of this layer of the atmosphere where the air is coldest.
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