PLATES IN VOL. L 



Plate I. ) „ .,. , /. r 



rj > British species of Lagena. 



jy" > Anatomy of Eolis. 



V. Development of Medusae. 

 VI. Development of Medusae. — Cypridina MacAndrei. 

 VII. Cypridina Adamsi. 

 VIII. Anacharis Alsinastrum. 



IX 1 



V* [-Structure and Growth of Monocotyledons. 



XI. "i 

 XII* \ ^^^ genera and species of Diatomaceae. 



XIIL 





^y* i- Ventriculidse of the Chalk. 



XVlJ 

 XVII. Spiridens Balfouriana. 

 XVIII. Grammitis blechnoides. 



XIX 1 



XX I Crasteropodous Mollusca. 



