PLATES IN VOL. XIX. 



Frontispiece. — Portrait of Dr. Johnston, 

 Pl ATE^I. I ^^^ Diatomace^. 



III. Development of Chara ver^icillata. 



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

 land. 



V. 

 VI. 



r ] 



r* ^Anatomy of Nautilus Pompilius. 



VII. New Echinodermata. 



VIII. New British Lichens. 



IX. Organization of Infusoria. 



X 1 

 vj" fForaminifera from the Coast of Norway. 



XII 1 

 XIII f^oleoptera from Old Calabar. 



XIV. Mites and their larval states. 



XV. Mechanism of Aquatic Respiration in the Cephalopods. 



XVI 1 

 XVII j J^^v^lopment of Pectinibranchiata. 



