a > 
85 
abdomine in spinam atcnaall acutam utrinque ex- 
tenso. | 
The exact contour of this species cannot be per- 
fectly ascertained from our specimen; it seems, how- 
ever, to have been lunate. The horns of the crescent 
which form the posterior angles, are very distinct, 
and they project like curved spines, some distance on 
each side of the head. The middle lobe or front is 
faintly scalloped on each side along the cheeks.4 ‘The 
cheeks are rather large, and are furnished with two 
small oculiform tubercles, very remote fromeach other, 
and quite near to the anterior portion of the buckler. 
The abdomen is composed of twelve articulations. 
The lateral lobes of the abdomen are flat, and each of 
the ribs, at about half their extent, is marked on the 
upper surface, with an elevated pimple. These little 
pustules are nearly on a line with the oculiferous tu- 
bercles of the buckler, and present two parallel ranges 
down the body, one on each side of the middle lobe, 
and are terminated by a curved spine, which projects 
to some distance beyond the tail of the animal. 
Length one inch and a fourth. 
This remarkable organic relic was found near 
Newport, in the State of New York. It is embedded 
in black limestone shale, and so exceedingly dépress- 
ed is this animal, that a very thin lamen of the slate 
removed from the surface would destroy every ves- 
tige of its appearance. I am indebted to my early 
friend, Professor T. R. Beck, for the use of this valu- 
able petrifaction, which now belongs to the cabinet» 
of the Albany Institute. 
H 
rr 
