LIST OF PLATES. 



PLATE FACING PAGE 



I. Chalk Polyzoa . . 8 



n. Apical Systems of some Irregular Echinoidea .... 16 



in. Professor A. E. Tornebohm 49 



IV. Tachylite, Cleveland Dyke . 68 



V. Dictyocalamites and Pterophyllum from Kent Coal-field . . 99 



VI. Map of English Channel Eiver-Valley 101 



Vn. Chalk Polyzoa 146 



Vin. Map of South Donegal, showing distribution of ' Drumlins ' . 153 



IX. ' Drumlins ' of South Donegal 158 



X. Portrait of William Carruthers . . . . . . . 193 



XI. Dionide atra, Salter . . 202 



Xn.i Map of Usu-san, Japan 248 



XIII. Usu-san, with the New Mountain, Lake of Toya . . . 250 



XIV. Chalk Polyzoa 294 



XV. Chalk Polyzoa - 296 



XVI. Fibularia Nigeria, Hawkins, sp. nov. ..... 300 



XVn. Portrait of Professor John Milne 337 



XVIII. British Ordovician species of Trinucleus ..... 352 



XIX. 'Fringe' around head-shield of TrimtcZews .... 394 



XX. Brachylepas Naissanti, Hubert, sp. . . . . . ■ 358 



XXI. Archarenicola Rhcetica, Horwood, sp. nov. .... 398 



XXII. New Chalk Polyzoa 433 



XXTTT. Brachylepas (?) fimbriatus and B. (?) tithonicus . . . 508 



XXIV. The Eev. E. Ashington Bullen , 525 



XXV. Cidaris faringdonensis, Wright ...... 529 



XXVT. Cidaris coxwellensis, Hawkins 529 



