‘Prof. O. Heer on the Miocene Flora of the Polar Regions. i 
Fig. 2. Portion of the same, enlarged: showing the solid axis, the com- 
mon canal, and the cellules. 
Fig. 3. Transverse section of Diplograpsus teretiusculus, His. : showing 
the axis as a transverse plate or partition. 
_ Fig. 4. Diplograpsus teretiusculus, His., nat. size: showing the proximal 
extension of the axis, or radicle (a), and the distal extension (6). 
Fig. 5. Central portion of Dichograpsus Logani, Hall, sp., from a speci- 
men sbflected by the author from the Skiddaw Slates: show- 
: ing the branched funicle and the celluliferous stipes. 
Fig. 6. Central disk and funicle of Dichograpsus octobrachiatus, Hall, 
sp. One of the divisions of the funicle (a) is shown prolonged 
into a celluliferous style (0). 
Fig. 7. Diplograpsus, n. sp.: showing a disk at the proximal extremity. 
Collected by the author at Garple Linn, near Moffat. - 
Figs. 8, 9,10. Varieties of Diplograpsus bicornis, Hall. Fig. 8. Normal 
form. Fig. 9. Variety with a rudimentary disk or cup; col- 
lected by Prof. Harkness at. Glenkiln Burn, Dumfriesshire. 
Fig. 10. Variety with a fully developed disk, after Hall. 
Fig. 11. Diplograpsus vesiculosus, n. sp.: showing the distal extremity of 
the axis expanded into a pointed vesicle. Collected by the 
author at Dobb’s Linn, near Moffat. 
Fig. 12. Germ of a monoprionidian Graptolite, enlarged. 
Fig. 13. Germ of a diprionidian Graptolite, enlarged. 
Fig. 14, Didymograpsus flaccidus, Hall, nat. size (recently described by 
Mr. W. Carruthers under the name of D. elegans). This form 
ag obviously never have been attached, but must have been 
ee. 
Fig. 15. Helicograpsus (Graptolithus) gracilis, Hall, sp., nat. size: a, 
_ funicle: 8, 6, celluliferous stipes. From a specimen collected 
, by the author at Glenkiln Burn, Dumfriesshire. 
Fig. 16. Non-celluliferous stem, or funicle, of Dendrograpsus Hallianus, 
Prout, after Hall. This species may perhaps have been 
attached. 
Fig. 17. Portion of the celluliferous branches of the same. 
Fig. 18. Diplograpsus resembling D. teretiusculus, His., but furnished 
with two lateral spines in addition to the central radicle. 
Fig. 19. Corynoides calicularis, Nich., enlarged. This form is allied to 
the Graptolites, but probably represents a different order. 
Fig. 20. Tetragrapsus quadribrachiatus, Hall, sp.: showing the funicle, 
radicle, and celluliferous stipes. 
X.—On the Miocene Flora of the Polar Regions. 
By Professor O. HEER *, 
THE numerous expeditions sent some years ago into the 
arctic regions have been, in every respect, productive in a 
scientific point of view. The bold navigators who explored 
the polar regions, surmounting the greatest difficulties, used 
every effort to bring back whatever they supposed might pos- 
sess interest. Geology has had its share in the results of 
these researches. A considerable number of fossil plants 
* Translated by W. 8. Dallas, F.L.S., from the ‘ Bibliothéque Univer- 
selle,’ Archives des Sciences, Nov. 25, 1867, pp. 218-231. 
