4 c 22 The Hon. Mr. Strangways on the 
as the purplish beds, have a texture sometimes crystalline, and the 
cavities are lined with minute cubic crystals of brown spar, of a 
red colour, together with well defined nail-headed crystals of white 
calcareous spar. The brown spar frequently encrusts the ortho- 
ceratites, and though forming a mass by no means compact, is of 
considerable hardness. 
The highest beds of the limestone, and which are at the same 
time at the greatest elevation above the level of the sea, compose 
the hills of Doudorof and Taply Sad. They are dry and sandy, 
of a pale straw colour, much resembling that of the English and 
Irish magnesian lime. The cavities which it contains are lined 
with very perfect crystals of white calcareous spar, and often with 
brown spar and pearl spar, of a pale, or sometimes of a bright 
yellow. It contains but very few organic remains ; and those which 
are found in it are not common in the lower beds, I must 
particularise 
A very large helicite, found by Mr. Havenschild, near Gatchina, 
in whose collection it now is. 
A species of elongated terebratulite, never quite perfect. 
A circular indented body, probably a fungite, the nature of 
which I cannot exactly ascertain, which I found near Poudost. 
Hysterolites, sometimes with wrinkled edges, These are found 
in the other beds, but rarely. 
Entrochi, very rarely. I found them at Skoovitza, 
It is evident that the summits of Doudorof and Teply Sad are 
only outliers or portions of these upper beds which have perished, 
the fragments of which are found scattered over the plateau, 
especially towards Gatchina. 
The heights of Tocotela and Paiola, which connect those hills, 
