434 
REFERENCES TO THE PLATES. 
(sparingly)—from East Looe to Gerran Bay, and finds 
that they take a course across the county to the north-west 
coast, appearingin the slate at St. Anne’s, so that, conformably 
with the transition strata, they pursue a direction east and 
west. Table 6.— Fig. 1 is an Encrinital head and piece 
of the stem attached, taken from the slate rock where it 
closely joins to limestone under Mount Edgcumbe, by the 
Rev. R. Hennah, who has kindly allowed it to be employed 
for the benefit of this work. The stem seems to have a 
twisted appearance like a bit of coarse cord, and has its 
counterpart at Fig. 5, which pourtrays a specimen taken 
by me from the slate rock at Staddon Heights on the op¬ 
posite side of the harbour. Fig. 2 represents the largest 
of a great number of Encrinital heads of varying shapes 
which I found in one small spot under Puslinch on the 
Yealm. The rock seems to he of that kind intermediate 
between slate and sandstone, these being on either hand, 
while the structure of the fossil itself—which is always 
curiously enclosed in a sort of rude case or shell, allowing 
the relique itself to be withdrawn and replaced at pleasure, 
in the same way as a cast fits into its mould—is of a some¬ 
what cheesy texture, greasy as it were to the feel, and 
having on its surface very often curious small markings of 
organic remains. The present specimen is different from 
all others I have procured in possessing a joint of the stem 
of the animal apparently peculiar in its character. I have 
observed the same fossil in one particular spot at Boveysand, 
as also in a part of the rock—arenaceous schist—at the 
mouth of the Erme. The scarcity of encrinital heads has 
been noticed as observable in the lime, but it is equally 
so in the slate, indeed the present are nearly all the kinds 
which I have seen, though encrinital columns of several 
species are noticed in all directions, more indeed than the 
present series of engravings exhibits. Fig. 4 gives a view 
of a sort of encrinital column from Boveysand, which bears 
on its surface in regular order a number of tubercles, dis¬ 
tinct in fact from all other kinds. Procured by Master Jones. 
Fig. 3 is a beautiful specimen from the slate at Mudstone ; 
it has a groove running along its whole length, and is of a 
compressed or flattened figure. Table 7.— Fig. 1 is a view 
of an encrinital column from the coarse grauwacke slate 
