imperforate

Although made and approved, this stamp is said to have been withheld from issue in this imperforate condition.

The 2nd or 1851 issue, as it is called in the circular, actually consisted of two series, the imperforate and perforate.

Attempts are, however, made to palm off trimmed reprints as imperforate specimens.

The reprinted three cents has the outer top and bottom lines of the original imperforate stamp.

Rhabdamminina, rab-da-mi-nī′na, n. a group of marine imperforate foraminiferous protozoans.