NOTE. — At the request of the late Dr. Davidson, and with the sanction of the Council, 

 the proof-sheets of this Memoir have been laid before Miss Agnes Crane, of Brigliton, 

 by whom they have been read on the Author's behalf. 



Previous to Dr. Davidson's lamented death, Miss Crane had Ijeen studying- the 

 Brachiopoda under his guidance, and was conversant with his wishes respecting the 

 publication of this work. 



