REFERENCES TO THE PLATES 
435 
of Jenny Cliff near Plymouth, where fragments of the 
same species are not unfrequently perceived; but I have 
seen this kind no where else. Fig. 2 is a representation 
of a fine description of encrinital column which I pro¬ 
cured at Mudstone, and where it seems to be not very 
rare, but I have never noticed the same species in any 
other locality. Fig. 3 (already noticed) Fig. 4 are 
encrinital joints of a particular kind, from the loose and 
poor clay-slate at Kitley Point, where I have never obtained 
above three specimens in the same perfection, though the 
impression of the surfaces of these joints is to be observed 
in several quarries and other spots around Plymouth, as at 
Staddiscombe, a specimen from the roofing-slate of which 
is represented at Fig. 7, but besides this common kind of 
impression of encrinital joints, there are others very similar 
to it, but yet apparently specifically distinct. Fig. 5 pre¬ 
sents a view of a beautiful sort of encrinital vertebrae which 
I found in Hangers quarry near Newhouse; the rim of 
each joint is marked with oblique lines similar to those we 
see on the rims of penny-pieces. Fig. 6 is given because 
in connexion with Fig. 7, it will afford the collector a 
knowledge of the two commonest fossils presented by our 
slate, and which indeed appear in the generality of quarries, 
and in the generality of the common clay-slate of the county; 
it presents very thin laminae for its joints, and the present 
figure gives only the pillar traversing through their centres, 
with the remains only of the plates at their attachment round 
the little stem ; the impression made by these plates is very 
frequently discerned, but the occurrence of the vertebral 
column in mass is rare ; three of the joints somewhat per¬ 
fect are engraved at Fig. 8, Table 2, (right hand fossil) and 
it often occurs to us to find the same remain or one similar 
presenting many partitions or transverse plates, and the 
central pillar removed by decomposition, the case being the 
reverse of Fig. 6 in the present Table. Fig. 8 is an en¬ 
graving of a small series of encrinital joints, possessing 
distinctive characters from all others, which I found in clay 
slate at Elburton. But besides the present, there are other 
varieties of encrinital reliques to be detected in our slate, 
though not admitting of being engraved, or of being defined 
by mere words. Indeed nothing but very considerable ex- 
3 I) 2 
