Report On The Mosses From The Arctic Bed

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Abstract
The moss-remains sent to me from the Arctic Beds at Ponder's End represented four separate gatherings. The first was a general collection from the deposit, while the others were taken from three superimposed beds, and are referred to as the Upper, Middle, and Lowest Beds. I have been able to determine with scarcely any doubt some forty or more species. A certain number at present unnamed may yet be determined, but these are so few that they cannot modify to any appreciable extent the conclusions to be drawn from those already determined. I give here a table showing the forms so far detected, with their distribution through the different beds. The fragmentary or patchy nature of the three superimposed beds left some doubt as to how far they represented different periods of deposit, or how far one or other of the upper layers might be simply a redistribution of the subjacent layers; and also as to the relation of any of them to the deposit from which the first sample was collected. The foregoing Table gives, I think, some reply to these problems. Leaving the Upper Bed out if the question for the present, it will be seen that of the forty of so forms determined from the remaining three beds, fourteen at least occured in all three. Of about 24 species determined from the Middle Bed, 16 at least are also in the Lowest, and 15 at least in the General Collection. Of about 32 determined from the General

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