THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
[FIFTH SERIES.] 
No. 74. FEBRUARY 1884. 
VII.—On a Specimen of Pecopteris (? polymorpha, Brongn.) 
tn Cuircinate Vernation, with Remarks on the Genera 
Spiropteris and Rhizomopteris of Schimper. By Ropert 
Kipston, F.G.8.* 
[Plate V. fig. 1.] 
ALTHOUGH the beautiful specimen which forms the subject of 
this communication does not throw any additional light on 
the growth of fossil ferns, yet as none of the figures of cir- 
cinate vernation with which I am acquainted surpass this 
example, I have ventured to give a short description and a 
figure of it. 
The fossil is about 3 inches long; but if we measure the 
full length of the circinately rolled-up portion as if it were 
straightened out, it is fully 6 inches inlength. The specimen 
is, however, incomplete at its lower extremity ; so its original 
size cannot now be ascertained. 
_ The rachis is thick and still shows slight traces of the little 
scales with which its surface was once covered. ‘he inner side 
of the rachis bears about thirty-three circinately rolled-up pinne. 
* Read before the Royal Physical Society of Edinburgh, December 19, 
3 
Ann. & Mag. N. Hist. Ser. 5. Vol. xiii. 6 
Pe AS ee 1 
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