432 
REFERENCES TO THE PLATES. 
of the animal remains of the above named rocks, hitherto 
so little known. Fig. 3 seems to be an Alcyonium. Fig. 4 is 
is apparently allied to that in slate at Fig. 2. Fig. 5 is a 
fragment of that beautiful and rare corallite the Pocillipora 
which I believe occurs likewise in our slate, and undoubtedly 
in the lime, as at the Thatcher rock in Torbay for instance, 
where I collected specimens. Table 4.— Fig. 1 presents 
us with a view of a most singular and rare fossil from the 
slate at Cann quarry ; it appears to have a little circle for 
its centre, the other ovoid shapes being arranged around it. 
I presume it may be the impression of some zoophyte, and 
probably of the Alcyonium tribe. I do not recollect that 
it has occurred to me elsewhere. Fig. 2 is perhaps some¬ 
thing of the same description, though here to each of 
the circular marks, is a central dot; the specimen is from 
Boveysand. Both have been designated Strombodes by 
some who have inspected these specimens. Figs. 3 and 5 
represent a univalve similar in shape to the Haliotis, and 
one valve of a bivalve perhaps similar to the Area, which 
were found by me in the “ grey duns tone” (a schist not dis¬ 
tinctly laminating, and having a different texture from our 
slates properly so called) at Mount Batten. I had been 
induced, prior to this discovery, to consign this modified 
form of slate to the series devoid of fossils, though properly 
speaking I know of no reason why it should be wanting in 
those reliques found in the rocks into which it graduates. 
These and other fossils of this spot are greatly marked and 
stained by iron, but fossils do by no means occur in the 
iron itself, nor do they even impress their shapes on its free 
surfaces as I have unfortunately been induced to state at 
p. 54 from the representations made to me by several 
geologists. Fig. 4 shews a somewhat indifferent specimen 
of an Orthoceratite from Boveysand, obtained by Master 
T. Jones. I might have given a view of a larger one, 
(not so perfect however as the present,) and indeed I suspect 
from the forms which I occasionally see in large blocks of 
slate, that this description of fossil shell is not very rare with 
us, and that moreover there are several kinds. Mr. Peach 
of Goran lately shew me a most beautiful and satisfactory 
specimen of a sort different from the present, and I then 
immediately perceived that the specimen, which, following 
