106 
Gregory, on Fossil DiatomaceoB. 
composition absolutely identical with that of the Lillhaggsjon 
Lapland deposit I have described. Not only the species are 
the same, but they are in the same proportions. In both 
Eunotia triodon presents in abundance its strange variations ; 
in both the long sigmoid form, and also the sickle-like form, 
occur. 
In short, I can detect no difference between these two de- 
posits ; besides the forms I have named, both contain Eunotia 
incisa, chiefly var. /3 ; and both alike contain such forms as 
Eunotia serra, Tetracyclus lucustris, and others, inasmuch that 
I think it more probable that one of them has been misnamed, 
than that two deposits, in places so distant as Liineburg in 
Hanover, and Lillhaggsjon in Lapland, should be identical in 
composition. Since all the specimens of earth from Oberrohe 
near Liineburg, and the Liineburg heath, that I have examined 
(and I have seen several different specimens in the natural 
state), differ from the Lapland earth, and since the Lapland 
earth is referred to its locality by the Zurich Association, I 
conclude that the earth in Mr. Norman's hand is really not 
from Liineburg, but from Lapland. Perhaps there may be a 
place called Liineburg in Lapland, near Lillhaggsjon ; but this 
I have not been able to ascertain. In the mean time, this 
so-called Liineburg deposit will supply observers with the 
two forms I have now described. I have noticed it in some 
other forms which I believe to be undescribed ;^to these I 
shall return on some future occasion. 
