CONTENTS. 



PAGE 



PREFACE .... vii 



MEMOIR OF DR. BOWERBANK, BY C. TYLER, F.L.S. . . xiii 



INTRODUCTION ....... 1 



CLASSIFIED LIST OF BRITISH SPONGES ... .5 



GEOGRAPHICAL DISTRIBUTION OF BRITISH SPONGES . . 15 



BRITISH SPONGIAD^, ORDER CALCAREA . . .25 



SILICEA . . . .27 



KERATOSA .... 183 



CATALOGUE OP WORKS AND PAPERS ON SPONGES . . 191 



APPENDIX OF BRITISH SPONGES NOT REFERRED TO BY DR. 



BOWERBANK ..... 225 



A. CALCAREOUS SPONGES OF ERNST HAECKEL . 225 



B. THE GENUS CLIONA SPECIES OF HANCOCK . 233 



C. VARIOUS BRITISH SPONGES . 238 



INDEX . . . 243 



& V / 



