"2-! ; 3 <2 ' '= ' ) 



A MONOGRAPH 



SI 



OF THE 



BRITISH SPONGIAM. 



BY 



J. S. BOWERBANK, LL.D., 



K.R.S.. K.I.S., F.G.S., V.7.S., F.R.A 5., 



MEMBEB uF THE ENTOMOLOGICAL SOCIETY OF LONDON; OF THE MICROSCOPICAL SOCIETI 



OF LONDON; CORBESPONDING MEMBER OF THE DUBLIN ITN1VEKSIT1 



ZOOLOGICAL AND BOTANICAL ASSOCIATION; OF THE PLYMOUTH INSTITUTION, AND 



DEVON AND CORNWALL NATURAL HISTORY SOCIETY, ETC. ETC. 



VOL. II. 



LONDON: 



PUBLISHED EOR THE RAY SOCIETY BY 

 ROBERT HARDWICKE, 192, PICCADILLY. 



MDCCCLXVI. 



