Account of a Book by Johannes Philippus Breynius entitled 'Dissertatio Physica de Polythalamics nova Testaceorum classe' or a Physical Dissertation of a new Class of Shell called 'Polythalamium' Proposes a methodological distribution of the Echini and Echinites or Stones, generated underground in the cavities of the Echini which are presented in a table Account by Richard Middleton Read to the Royal Society on 14 June 1733 Account printed in 'Philosophical Transactions', vol 38, no 430, p 191 1733