PLATES IN VOL. XVL 



of the C; 

 the Diatomacese. 



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



■{ \ New or little-known Marine Animals. 



\ Palaeozoic Bivalved Entomostraca. 



IV. 



V. 

 VL 



VIL Young States of some Annelides. — Circulation in the Pyeno- 

 gonidip. 



VIII. New or little-knowTi Marine Animals. 



IX. Mechanism of Aquatic Respiration in Invertebrate Animals. 



X. New Species of Braohiopoda. 



XI. Mechanism of Aquatic Res])iratiou in Invertebrate Animals. 



