66 MATONIDIUM. 
their identity with atonidium. The position of the pinne shows 
a gradual convergence towards a point of attachment. 
The elliptical or oval sori are distinctly shown on the lower 
surface of the pinnules. Ecclesbourne. Rufford Coll. 
Fig. 7.—Matonidium Gépperti (Ett.), showing portion of a fertile 
pinna (a) (V. 2218). 
V. 721. Rachis very prominent; some of the pinnules with 
sori. Ecclesbourne. Dawson Coll. 
V. 2208. Very similar to V. 2218. Pieces of six pinne. Note 
the gradual convergence towards the original point of attachment to 
the stout rachis. Ecclesbourne. Rufford Coll. 
V. 2211. Shows the convergence to a common point of attach- 
ment of imperfectly preserved pinne. Kecclesbourne. Rufford Coll. 
V. 2216. Small fragments of ? fertile pinnae. Ecclesbourne. 
Rufford Coll. 
