PLATES IN VOL. XVL 



Plate I. \ Structure of the Carapace in the Crustacea. — Conjugation of 

 II. / the Diatomacese. 



Yy' V New or little-known Marine Animals. 



V 



Palaeozoic Bivalved Entomostraca. 



VI.} 



VII. Young States of some Annelides. — Circulation in the Pycno- 

 gonidse. 



VIII. New or little-known Marine Animals. 



IX. Mechanism of Aquatic Respiration in Invertebrate Animals. 



X. New Species of Brachiopoda. 



XI. Mechanism of Aquatic Respiration in Invertebrate Animals. 



