Notes on American Land Shells and Other Miscellaneous Conchological Contributions, Vol. 2: Part III (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Notes on American Land Shells and Other Miscellaneous Conchological Contributions, Vol. 2: Part III

On the floor of the mouth is the lingual membrane, occupying about the position of the human tongue. Its color is too nearly the same as that of the head to afford any strong contrast, but, with close attention, it will be detected by its glistening silvery appearance, as it works backward and forward.

The use of the tongue seems to be to rasp the food and also to force it back into the oesophagus.

More detailed description, fully illustrated by figures, of the position of these two organs, will be found in the chapters on Special Anatomy in the first volume of the Terrestrial Air-breath ing Mollusks of the United States.

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