What are palatal folds?

Some articles on folds, palatal folds:

Strobilopsidae - Shell Description
... oblique, with armature of 2 or 3 parietal lamellae and several deeply placed basal folds, all growing continuously from an early neanic stage ... in the arrangement of the lamellae and baso-palatal folds ... It is possible, however, that upper and lower palatal folds of Pupillidae are represented by teeth 5 (the most right basal tooth) and 2 (second left basal ...

Famous quotes containing the word folds:

    Bunched upside down, they sleep in air.
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