PLATES IN VOL. XIX. 



Frontispiece. — Portrait of Dr. Johnston. 



III. Devclo[)nient of Chai-a verticillata. 



IV. Fossils from the Permian System of Durham and Nortliumber- 



hmd. 



Yj" [■Anatomy of Nautilus Pompilius. 



VII. New Echinoilermata. 

 VIII. New British Lieheus. 

 IX. Organization of Infusoria. 



yy" [ Foraminifera from the Coast of Norway. 



r' [•Coleoptera from Old Calabar. 



XII. 

 XIII. 



XIV. Mites and their lai-vsil states. 



XV. Mechanism of Aquatic Respiration in the Cephalopoda. 



XVTT f Development of Pectinibranchiata. 



