282 



DESCRIPTION OF PLATES. 



Plate XI. 

 Pig. la. ^Kopionella tasmanica, Ashby, anterior valve, x5. 

 ,, 16. „ ,, ,, median valve, x5. 



,, Ic. ,j ,, „ posterior valve, x5. 



,, Id. ,, ,, ,, showing 3 classes of girdle 



spicules. 

 ,, 2. Haploplax Tnayi, Y&,r. viridis, Ashby, sheU, xlO^. 

 ,, 3, Ischnochiton lineolatus^ Blainville, showing girdle scales, 



x28. 

 ,, 4. ,, crispus, Reeve, showing girdle scales, xl7. 



Plate XII. 

 Fig. 5a. Ischnochiton atkinsoni lincolnensis, Ashby, shell, x6. 



56. ,, ,, ,, ,, showing girdle 



scales, x28. 

 auratus, Ashby, shell, x8. 



,, ,, showing girdle scales and 



.anterior valve, x28. 

 properensis, Ashby, shell, x4^. 



,, ,j showing girdle scales, 



x28. 



Note. — The girdle scales with one exception are the siame 

 magnification, thus showing the relative sizes of the scales. 







6a. 





66. 





7a. 





76. 





