1102 Proceedings of Royal Society of Edinburgh. [sess. 
complied with my request. The section Phytoplankton (pp. 1 106— 
1 1 28) is therefore entirely his work. The common results have been 
prepared by both of us ; the rest of the paper is worked out by me. 
Our knowledge of the Icelandic fresh- water plankton is at this 
moment but slight. De Guerne and Richard (1892, p. 310) com- 
municated the zoological results arrived at by examination of some 
samples gathered by M. Rahot in three different regions of Iceland. 
One is gathered in the northern part near Akureyri, one in the 
western part in the neighbourhood of Reykiavik, and one in the 
eastern part, Lagarfjot, near Eskifiord. The samples contained 
29 species : 16 Cladocera, 8 Copepoda, 2 Ostracoda, 2 Rotifers, and 
1 Protozoan. The greater part of these species are bottom or 
shore animals, and only a smaller part of them are plankton 
animals. In Thingvallavatn M. Rabot had gathered the following 
species : Scapholeberis mucronata, O.F.M. ; Bosmina arctica, Lillj. ; 
Eurycercus lamellatus , O.F.M. ; Acroperus leucocephalus, Kock ; 
Alona affinis , Leyd. ; Chydorus sphoericus, Jurine. ; Polyphem,us 
pediculus, De Geer ; Diaptomus minutus, Lillj. ; Cyclops strenuus, 
Fischer ; Cyclops viridis , Fischer. 
In the samples from Lagarfjot, De Guerne and Richard have found 
Holopedium gibberum i Zaddach ; Diaptomus minutus , Lillj. ; and 
D. glacialis, Lillj. 
The result of the exploration may he summed up thus : Iceland 
takes an intermediate position between the arctic and the temperate 
region. 
The phytoplankton in a sample from a lake in south Iceland, 
63° 28' lat. N. and 18° 55' long., has later on been described by 
Mr Ostenfeld (1904, p. 331). This paper will he mentioned in 
the botanical part. Besides this, several small papers by Hariot 
Bellocq and Borgesen deal with some fresh-water algae, among 
which a few plankton species may occur. 
As I wished, as far as possible, to test the tps. reported to me, 
I applied to the Meteorological Institute of Copenhagen, which 
also has meteorological stations in Iceland. Mr Willaume 
Jantzen, second director of the Institute, kindly informed me of the 
fact that there were no stations situated at the two lakes. But 
as there was one at Reykiavik, it thus became possible to test the 
tp. measured in Thingvallavatn. Another was situated at Storinupur, 
