The recent exhibition by Mr. Hunter Blair of the seal matrix of John de Levermonde or Learmouth, belonging to Mr. R. C. Bosanquet, affords an opportunity of putting together a few notes on a peculiar class of matrix of which that of John de Levermonde is an example. Their interest lies in the fact that the centre portion, on which is engraved the device, is made to screw out about an eighth or a quarter of an inch, thus enabling the device to be used, without the legend, as a secret. So far I have record of eight examples, all except one of silver, which are, or at least till quite recently were, extant. Although it is unlikely that this class of matrix was ever at all common, being probably but a passing fashion, yet these few surviving examples cannot represent a tithe of those that were made, and it is possible that a considerable number of small seals without legends, of which impressions only exist, belongs to this class. But unless examples should be found in both states, with and without the legend, it is impossible to be certain.