20 
PALEONTOLOGY OF NEW YORK. 
Facial Sutures very rarely discernible. Occasional examples, in unusually 
perfect state of preservation and favorably weathered, or compressed in such 
manner as to slightly separate the cephalon along these lines, show that they 
take their origin on the lateral margins just in front of the genal angles, pass 
along the posterior edge of the visual area, thence forward along the margin 
of the palpebrum, following the frontal fnrrow of the glabella until they 
meet, thus taking the normal direction for the facial sutures in the PhacopidcR. 
It is probable that the separate parts of the cephalon, in all stages of growth, 
are virtually anchylosed along these lines, as the cheeks are rarely, if ever, 
found detached. 
Glabella large, gibbous, filling all the space between the palpebral lobes, 
and separated from them by deep furrows. Outline sub-pentagonal; greatest 
width anteriorly. Transverse lateral furrows three on each side, of which 
the first two are obsolescent, often discernible only on casts of the under 
surface. In well-preserved specimens their existence is indicated by obscure 
depressions in the ornamentation of the surfiice. The third pair of trans¬ 
verse furrows is very strong, extending entirely across the posterior limb 
of the glabella, making a narrow annulation in front of the occipital ring. 
In favorably preserved specimens there are faint indications of short, longi¬ 
tudinal furrows parallel to the ocular sulci, and in front of the first pair of 
transverse glabellar furrows. 
Cheeks abruptly sloping to the margin nearly in a plane with the visual 
area, narrowing anteriorly and reflected ventrally to form the doublure. 
This doublure or infolded margin is broad at the genal angles, narrowing 
somewhat beneath the eyes, thence forward, widening beneath the glabella to 
form the broad depressed epistoma. A strong sulcus passes along the doub¬ 
lure just below the margin, widening into a broad groove upon the epistoma, 
and toward the genal extremities its margins bear five or six crenulations 
which become finer as they approach the angles. 
Eyes prominent, scarcely reaching the height of the glabella in uncom¬ 
pressed specimens. Palpebral lobe strong, scarcely as high as the palpehrum 
and extending to the occipital furrow. Palpebrum crescentic. Visual area 
