406 Miscellanies. 
leave to state, that a few days since I ebtained a petrifacation from 
the surface of a fragment of limestone from Becraft’s mountain, 
which, after cleaning, proved to be a perfect specimen of the second 
variety of encrinite, called by Parkinson the cap encrinite. This is 
the first and only specimen of this family of fossils which has been 
found in this vicinity. The fossil vertebral remains of this animal con- 
stitute the principal part of the rocks of this mountain. Having no 
figures of the above named fossil in my possession, I cannot conclu- 
sively determine whether this be the cap or the pear encrinite; [am 
however inclined to the opinion of its being the former. I would also 
state, that I have recently discovered an excellent locality of calca- 
reous tufa about:a mile from this city. It is mostly stalactical and 
very compact, some being susceptible of a beautiful polish. Im- 
pressions of fern I lately discovered on shale overlying a narrow 
vein of coal, about a mile and a half south of this place. I mention 
the above as being altogether new in this neighborhood. 
Hudson, May 224, 1837. S. A. Row.ey. 
11. Description of a New Trilobite ; by Jacos Green, M. D. 
Prof. of Chem. in Jefferson Med. Coll. 
CatyMeneE Row. Green. 
The outline of this fossil as it lies upon the rock presents a very 
regular oval figure. ‘The buckler and the body are a good deal ele- 
vated, and measure longitudinally nearly an inch and two thirds. 
The buckler is lunate, and is edged round its whole border with a 
little groove or channel. Its front or middle lobe is elevated above 
the cheeks, is rounded at its anterior part and gradually enlarges as 
it approaches the middle lobe of the abdomen. ‘There are no tu- 
bercles or folds upon it, but its posterior angles are so truncated as 
to form a subtriangular protuberance on each side of the commence- 
ment of the vertebral column. The cheeks are shaped like spher- 
ical triangles, and seem from our specimen, to have projected on 
each side to the fourth articulation of the abdomen. The oculife- 
rous tubercles are large and lunate; they are placed close to the 
front and seem almost to forma part of it; they are situated just be- 
fore the protuberances above mentioned. 
The abdomen and tail can readily be distinguished. There are 
twenty three articulations in both. The middle lobe is very promi- 
nent, is separated from the lateral ones on each side by a deep chan- 
