82 THE AMERICAN NATURALIST. 
venient name of Cycadofilices; and also to the very important 
correlation of structures hitherto regarded as representing distinct 
organisms, but now known to be different members of plants belong- 
ing to the genus Medullosa. 
The specimens of M. anglica studied were obtained from the 
colliery at Hough Hill, Stalybridge, and are of exceptional interest, 
not only as “being the first recorded British specimens of the 
genus," but “also from their geological horizon, which is con- 
siderably more ancient than that of the continental Medullosez.”’ 
They are at the same time the most complete examples of the genus 
hitherto studied, and they thus furnish most important data with 
respect to our knowledge of the entire group. Although lacking in 
some of the most important structural characters (the fructification), 
the material furnishes further and important additions to our knowl- 
edge of the filicoid origin of the cycads. 
BE 
