\ 
152 THE MEDALS OF CREATION. Cuap. VI. 
preservation ; and in the fluvio-marine deposits of the Oolite 
of Yorkshire, many specimens of great beauty have been 
collected. 1 know not another locality in England so rich 
in fossils of this kind, as the cliffs along the coast near 
Scarborough ; Gristhorpe Bay is well known to collectors. — 
Not only the leaves, but also the fruits or cones occur, and 
of these, examples are to be seen in most public museums.* 
The leaves are carbonized, but the venation is well pre- 
served. 
The leaflet of the recent Cycas is dis- 
tinguished by a strong nervure, which 
runs along the middle; that of Zamia — 
has no mid-rib, but fine parallel veins 
that pass direct to the margin. 
PTEROPHYLLUM compTUM. Lign.46. 
—The general aspect of these fossils _ 
is shown in this figure of a leaf, re- — 
ferred to the genus Pterophyllum, 
which is characterized by leaflets, — 
often slightly united at their base, 
truncated at the summit, of a qua- 
drangular or oblong form, and having ~ 
fine, straight, parallel veins. The 
leaves are ten or twelve inches long, — 
and have fine lanceolate leaflets ; 
they are abundant in the same beds, © 
and are often associated with the cones 
ee cece: a leaf of or fruitt figured in Lign. 48. 
OMPTUM ; 
nat. ZAMITES PECTINATUS. Lign. 47. — 
mee: Scarborough. In the Stonesfield slate, collocated 
with remains of reptiles, fishes, insects, and mollusks, — 
leaves and fruits of cycads are occasionally met with. 
* British Museum : see Petrifactions, p. 54, Room 1, Case F. 
+ Brit. Mus. Petrifactions, p. 55. ‘ 
