MARINE ALGiE.— G. DICKIE. 
45 
V , — Marine Alga; {exclusive of the Diutomacea;'). 
By G. Dickie, A.M., M.D., D.L.S., Professor of Botany in the University of 
Aberdeen. 
The total number of marine species of Algce known to be indigenous to Kerguelen 
Island (excluding Diotonmeea;) is 71. The collections upon which this estimate is 
based are those made respectively by — 
Dr. Hooker (Antarctic Expedition) in the winter of 18 lO (iMay — July), chiefly 
at Christmas Harbour, comprising 39 species ; 
IMr. Moseley (Challenger Expedition) in the summer of 1871 (January and 
February), chiefly at Christmas Harbour and the eastern coast as far as Betsy Cove, 
comprising 37 species ; 
Dr. Kidder (American Transit of Venus Expedition) in the spring and first part 
of the summer of 187-1-5 (Sept, to Jan.) near Molloy Point, towards the entrance 
of Iloyal Sound, comprising 22 species ; 
And the llcv. A. E. Eaton (English Transit of Venus Expedition) in the spring 
and summer of 1871-5 (Oct. 11 — Feb. 27), in the interior of Iloyal Sound (Obser- 
vatory Bay) and in Swain’s Bay, comprising 53 species. 
The botanical results of the German Transit of Venus and Surveying Expedition, 
which was stationed for about two months at Betsy Cove, are not yet made known. 
Mr. Eaton was at Observatory Bay during October, November, most of Decem- 
ber, and the whole of February, during which time he made frequent use of the 
grapple. In Swain’s Bay he collected Algce on nine occasions betw'ccn the 15th 
and the 30th of January inclusive. Of the 63 species in his collection 11 were 
obtained in Swain’s Bay, and only 32 at Observatory Bay : 21 species (probably 27 
or 28, vide infra) arc common to both of the areas, 21 occurred (to Mr. Eaton) only 
in Swain’s Bay, and 8 (from which 3 or 4 should be deducted, and added to the 
species common to both) were collected only in Observatory Bay. The preponde- 
rance of the Swain’s Bay gatherings may partly be accounted for by the distance of 
Observatory Bay from the open sea. For Mr. Eaton noticed that in some very 
retired parts of Swain’s Bay the components of the iVlga flora and their state of 
growth were very similar to those prevailing at Observatory Bay. In advancing 
from the more sheltered to more open waters ho observed considerable regularity 
maintained in the rate of change proceeding in the composition of the Alga flora ; 
so that it was possible, while collecting in one place, to conjecture beforehand with 
tolerable accui-acy the number of additional species that would be found in other- 
positions more exposed to the slight swell that enters the bay from the outer sea. 
And he was of opinion that if it had been possible to have visited the coast external 
