The Conchologist's First Book / A System of Testaceous Malacology, Arranged Expressly for the Use of Schools, in Which the Animals, According to Cuvier, Are Given With the Shells, a Great Number of New Species Added, and the Whole Brought Up, as Accurately as Possible, to the Present Condition of the Science.

by Edgar Allan Poe; Thomas Brown

Imperforate, having no umbilicus.

Inequilateral, when the anterior and posterior parts of the shell are dissimilar.

Inequivalve, when the valves are dissimilar.

Inarticulate, indistinct.

Incumbent, one lying over the other.

Incurved, bent backward.

Indented, unequally marked.

Inflated, tumid, swollen.

Inflected, bent inward.

Inflexed, bent towards each other.