A MONOGRAPH 



OK TIIIC 



BRITISH SPONGIAD/E, 



BY 



J. S. BOWERBANK, LL.D., 



F.R.S., F.L.S., F.Q.S., F.Z.S., F.R.A S., 



MEMBER OF THK ENTOMOLOGICAL SOCIKTY OF LONDON; OF THE ROYAL MICROSCOPICAL SOCIETY 



OF LONDON; CORRESPONDING MF.MBKK OF THE DUBLIN UNIVERSITY 



ZOOLOGICAL AND BOTANICAL ASSOCIATION; OK TDK PLYMOUTH INSTITUTION, AND 

 DEVON AND CORNWALL NATURAL HISTORY SOCIKTY, ETC. KTC. 



VOL. 111. 



LONDON: 

 PRINTED FOR THE RAY SOCIETY, 



MDCCCLXXIT. 



