A 



HISTORY 



OF 



BRITISH SPONGES AND 

 LITHOPHYTES 



BY 



GEORGE JOHNSTON, M.D., Edin. 



Fellow of the Royal College of Surgeons, Extraordinary Member of the Royal Medical, 

 aiid Corresponding Member of the Medico-Chirurgical Societies of Edinburgh; Cor- 

 "responding Member of the Zoological Society of London ; Honorary Member of the 

 Royal Zoological Society of Ireland, of the Dublin Natural History Society, of the 

 Natural History Society of Newcastlc-r.pon-Tyne, of the Devon and Cornwall Natu- 

 ral History Society, of the Literaiy and [Philosophical Society of St Andrews, and of 

 the Tweedside Physical Society. 



W. H. LIZARS, EDINBURGH : 



S. IIIGHLEY, 32, FLEET STREET, LONDON ; AND 



W. CURRY, JUN. AND CO. DUBLIN. 



MDCCCXLII. 



