- zoology a gland in certain invertebrates that secretes the components required for forming the shell of an egg
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Examples from the Web for shell gland
In B the shell-gland has flattened out and the shell is formed.
In A the shell-gland and the mouth and the rudiment of the enteron are shown; primitive mesoderm cells.
The shell-gland is destined in Limnaeus to become very rapidly stretched out, and to disappear.
The shell-gland arises as an epiblastic thickening on the posterior and dorsal side.
In the centre is the mantle with the shell-gland which is now very considerably raised beyond the general surface.