Xll 
EXPLANATION  OF  THE  PLATES. 
Plate 
XVII. 
XVIII. 
XIX. 
XX. 
Page 
I  MicRoscoric  Sections  of  Metamorpiiic  Rocks,  Soap,  to 
illustrate  Messrs.  Alfred  Harker  and  J.  E.  Marr’s  Supple- 
(  mentary  Rotes  on  those  rocks .  359 
("Formation  of  Limestone-nodules,  to  illustrate  Mr.  F. 
>  Rutley’s  paper  on  the  Dwindling  and  Disappearance  of 
[  Limestones .  372 
[  Pitciistone  and  Andesite  of  the  Cir  Miior  Dyke,  micro- 
1  scopic  sections,  to  accompany  Prof.  J.  W.  Judd's  paper  on 
[  Composite  Dykes  in  Arran  .  536 
f  Astroccenia  and  Stelidioseris,  to  illustrate  Mr.  R.  F. 
[  Tomes’s  papers  on  those  fossils  .  569,  574 
