A MONOGRAPH 



BRITISH SPONGIADiE. 



J. S. BOWERBANK, LL.D., 



F.n.S., F.L.S,, If.G.S., F.Z.S., P.U.A.S., 



MEMBER OF THE ENTOMOLOGICAL SOCIETY OF LONDON; OF THE MICROSCOPICAL SOCIETY 



OF LONDON; COKEESPONDING MEMBEK OF THE DUBLIN UNIVERSITY 



ZOOLOGICAL AND BOTANICAL ASSOCIATION; OP THE PLYMOUTH INSTITUTION, AND 



DEVON AND CORNWALL NATURAL HISTORY SOCIETY, ETC. ETC. 



VOL. II. 



LONDON • 



PUBLISHED FOE THE EAY SOCIETY BY 

 ROBERT HARDWICKE. 193, PICCADILLY. 



MDCCCLXVI. 



