W. Ireland (W. of France, Spain, Portugal and
shores of Mediterranean).

11. _Dabeocia polifolia._ W. Ireland (W. of France, Spain and
Portugal).

{365} 12. _Pinguicula grandiflora._ S. W. Ireland (Spain, Pyrenees,
Alps of France and Switzerland).

13. _Neotinea intacta._ W. Ireland (S. France, Portugal, Spain, and
shores of Mediterranean).

14. _Spiranthes romanzoviana._ S. W. Ireland (North America).

15. _Sisyrinchium angustifolium._ W. Ireland (North America, Arctic and
Temp.).

16. _Potamogeton lonchites._ Ireland, Mr. Arthur Bennett informs me
that this is certainly not British or European, but may possibly be
identical with _P. fluitans_ _var._ _Americanus_ of the U. States.

17. _Potamogeton kirkii_ (_natans_ sub.-sp.). W. Ireland. (Arctic
Europe?)

18. _Eriocaulon septangulare._ W. Ireland, Skye, Hebrides (North
America).

19. _Carex buxbaumii._ N. E. Ireland, on an island in Lough Neagh
(Arctic and Alpine Europe, North America).

20. _Deyeuxia neglecta_ (_var._ _Hookeri_). On the shores and islands
of Lough Neagh. (And in Germany, Arctic Europe, and North America.)

We find here nine south-west European species which probably had a wider
range in mild preglacial times, and have been preserved in the south and
west of Ireland owing to its milder climate. It must be remembered that
during the height of the glacial epoch Ireland was continental, so that
these plants may have followed the retreating ice to their present stations
and survived the subsequent depression. This seems more probable than that
so many species should have reached Ireland for the first time during the
last union with the continent subsequent to the glacial epoch. The Arctic,
Alpine, and American plants may all be examples of species which once had a
wider range, and which, owing to the more favourable conditions, have
continued to exist in Ireland while becoming extinct in the adjacent parts
of Britain and Western Europe.

As contrasted with the extreme scarcity of peculiar species among the
flowering plants, it is the more interesting and unexpected to find a
considerable number of peculiar mosses and Hepaticae, some of which present
us with phenomena of distribution of a very remarkable character. For the
following lists and the information as to the distribution of the genera
and species I am indebted to Mr. William Mitten, one of the first