PLATES IN VOL. XX. 



Plate I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII." 



XIX. 



XX. 



XXI. 



XXII. 



XXIII. 



Notodelphys ascidicola. 



Notodelphys ascidicola. — Halarachne Halichseri. 



Halarachne Halichseri. 



Conjugation in the Diatomaceae. 



i- Polycystina of Barbados 

 1 Ventriculida3 of the Chalk. 



Fossil Plants and Animals from the Rocks associated with the 

 ' Coal of Australia. 



> New species of Brachiopoda. 



V New species of Butterflies. 



Conjugation in the Diatomaceae. 

 Stethorectus ingens. 



ERRATA IN VOL. XIX. 



Page 380, line 16 from the top, for obsitis read obsito. 



for mesosternum, wherever the word occurs, read postpectus. 





