Vol. LII. 
Trans. Roy. Soc. Edin. 
De John M‘Lean Thompson on “ The Anatomy and Affinity of certain Rare and Primitive Ferns.” Part II.— Plate III. 
Fig. 27. 
Fig. 29. 
Fig. 31. 
Fig. 24. 
Fig. 26. 
Fig. 25. 
Fig. 30. 
J. M.‘L. T. del. 
