430 
REFERENCES TO THE PLATES. 
collectors. Turbinolites occur both in limestone and in 
sandstone. Table 2. — Figs. 1 and 3 represent two kinds 
of Cyathophyllum from the slate at Mudstone, the first 
being of an ivory whiteness. Fig. 2 appears to be of an 
Astrea which I procured from the same locality ; the spe¬ 
cimen itself is not more than i inch deep, is of a pink 
colour, and is surrounded by a space of pure white, as the 
engraving well exhibits. Caryophyllites probably occur in 
our slate, as they undoubtedly do in our sandstone and 
limestone, and I believe I may affirm that the sandstone 
participates in the genus Cyathophyllum, of which speci¬ 
mens are found in our slate as above mentioned. Fig. 4 is 
an excellent engraving of a very rare description of Astrea 
found by me in the roofing quarry at Yeo near Yealmpton, 
and which I have seen only twice since in a quarry at 
Elburton ; the figure itself gives but the impression made 
by the end of the creature, there being a cylindrical and 
long tube of the same diameter in the slate and leading 
down to it, occupied of course in the first instance before 
dissolution occurred, by the body of this zoophyte ; lying 
on the centre of this impression or cast and fitting exactly 
its markings, there is a thin and loose fragment of hard 
material probably part of the remains of the animal sub¬ 
stance. Astreas are I believe present in our sandstone, as 
they are in the slate and lime; something of the sort I found 
plentiful in sandstone at Newton Ferrers. Fig. 5. presents 
a view of I believe a Berenicea, several specimens of which 
I collected in a roofing-slate quarry at Coffleet, and once 
or twice since, elsewhere. The engraving I am sorry to 
say is hardly satisfactory, (a remark I shall not have occa¬ 
sion to repeat) the specimen being in fact an aggregation 
of small, inclined cells rather pitcher-shaped, imitating 
indeed very remarkably the modern B. utriculata. Fig. 6 
is a small fragment of Coral , (but from what genus I do 
not pretend to determine) taken from the slate at Mud¬ 
stone. There are altogether several kinds of Coral to be 
discriminated in the slate of Devon and Cornwall, and one 
in particular which is very common in that same locality and 
less so in some other spots, is somewhat analagous in 
its fan-shaped expansions and perforations to the Gorgonia 
ftabellum. We see commonly, only the impressions which 
