See letter to Edwin Lankester, 30 January [1852]. In that letter only twenty presentation copies were mentioned. CD’s list of presentation copies also indicates that twenty copies were available (MS attached to CD’s copy of Living Cirripedia (1854) in the Cambridge University Library). The twenty-two copies referred to here may include those due to CD as a subscriber to the Ray Society.

Ray Society publications were sold by subscription and not through booksellers. A list of subscribers was usually bound into the backs of Ray Society volumes.