EXPLANATION OF THE PLATES, 
v PLATE 21. 
This represents the view looking out from the most distant of the arched rocks 
in Plate 21. 
' PLATE 22. 
Fig. 1. Represents a new Pentacrinus found lately at Lyme Regis, consider- 
ably resembling that called by Mr. Parkinson the Briarean. 
Fig. 2. Is the part from which the arms spring. 
Fig. 3. Represents the lower part of the stem, which is so nearly circular, that 
at first it was thought to be an encrinus. 
Fig. 4. Part of the stem to wards the head, exhibiting decidedly the^entagonal 
form. See 379. 
' PLATE 23 . 
Fig. 1. A new and peculiar species of Encrinus. See page 3S0. 
Fig. 2, 3, 4, & 5, Represent a separated Pelvis belonging to the Briarean 
Pentacrinus. See page 380. 
" PLATE 24. 
Map of part of the course of the brook Pulcovca, near Petersburgh. 
PLATE 25. 
Views on the brook Pulcovca, coloured geologically. 
* PLATE 26. 
Fig . 1. Landslip of the dark green clay on the right bank of the Pulcovca, 
marked a in the plan and section. See page 390 and 391. 
Fig. 2. View looking down the Pulcovca. x and^ are dykes in the limestone 
rock, filled with diluvium. These plates represent the natural colours of 
the rocks. See page 390. 
