BY U. ETHERIDGE, JUN. 231 



very faintly visible, although under a low power lens it can he 

 caught in certain lights on the narrow frond on the right-hand. 

 The secondary veins, so far as they can be made out, leave the 

 mid-rib at an obtuse angle, curving gradually outwards, and for 

 quite half their distance are simple. The mesh then occupies the 

 other half of the frond, and forms an acutely rhomboidal net-work. 

 The lower portion of all the leaves in which that part is visible 

 shows a transversely puckered or wrinkled surface. This is not 

 structural, but arises, in all probability, from pressure. 



The upper end of the caudex is rounded. The cicatrices, or 

 leaf-scars, seen on its impression (PL xviii. fig. 2), seem to be ovo- 

 rhomboidal, arranged alternately, or in oblique rows. The internal 

 cast, lying loosely in its impression, bears on its surface a number 

 of ill-preserved rod-like projections (PI. xviii. fig. 3), that in all 

 probability represent the vascular bundles. Some of the leaf-scars, 

 more particularly when taken by a wax mould, show the scars of 

 three vascular bundles to the cicatrix. The lower portion of the 

 internal cast bears a series of concentric undulations, which are 

 probably superinduced (PI. xviii. fig. 4). 



Now, the facts we learn from a study of this specimen are the 

 following : — 



1. A general confirmation of Dana's (and possibly McClelland's) 

 description of the mode of attachment of the fronds, so far as it 

 was known to them. 



2. The leaves did not merely form a clump at the growing end 

 of the root-stalk, but were successively developed along the whole 

 course of the latter, and weie deciduous. 



3. The leaves were both petiolate (Dana's) and sessile (PI. xviii. 

 fig. 1, PI. XIX. fig. 1), or probably sub-sessile. 



4. The leaf-scars were probably ovo-rhomboidal, and to each 

 there appear to have been three bundles of vessels. 



