EXPLANATION OF THE PLATES. 
" PLATE 27 . 
j fig. 1. View of the Pulcovca coloured geologically. The colours correspond 
with those in plate 25. See page 390. 
Fig. 2 & 3. Two Sections of the Pulcovca outlier. 
Fig . 4. Section of the Strata along the course of the Pulcovca, to explain the 
relative situation of the disturbed beds. 
^ PLATE 28. 
Map of the environs of St. Petersburg. 
* PLATE 29. 
Fig. 1. Section of the heights of Crasno Celo, near St. Petersburg, from N.E. 
to S.W. See page 401. 
Fig. 2. Section of the hills on the east side of the Ligovca. See page 401. 
Fig. 3. Clay veins on the Coirovca. See page 407. 
Fig . 4. Represents a Section of the country on the right bank of the Neva. 
See page 414. 
' PLATE 30. 
The upper part of the valley of the Ligovca, coloured geologically. See page 
429. 
- PLATE 31. 
Fig. 1. View near Gertova on the right bank of the Tosna. See page 447. 
" PLATE 32. 
Map of the Island of Antigua, coloured geologically. See Dr. Nugent’s paper, 
page 459. 
- PLATE 33. 
Sections of the Island of Antigua, coloured geologically ; the directions in 
which the Sections are taken are marked on the map, plate 32. 
