6 
38 
CO 
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The American Geologist. June, 1892 
the extremity of the pygidium, and is rounded at the anterior 
corners. 
Locality. St. John group, at Porter’s brook. 
This species is of the type A, parvifrons Linrs. 
Section III, LIMBATI. General form subquadrate, head 
has a broad limb, basal lobes large. The cheeks in front of the 
glabella are not divided by a central. groove or grooved at the 
sides. The pygidium is usually produced into lateral spines. 
(Agnostus rex Barr, pl. x fig. 138). 
Series A. (REGID). Distinguished by its broad limb, dimin- 
ishing cheeks and side lobes of the pygidium. Both the anterior 
lobe of the glabella and the posterior lobe of the pygidium ex- 
pand. (Type Aghostus rex Barr). 
Series B. (FALLACES). This series has a smaller head, and 
moderately broad limb. Cheeks large; basal lobes rather large 
with a broad posterior lobe to the axis of the pygidium. (Type 
Agnostus fallax Linrs, pl. x, fig. 2). 
AGNOSTUS VIR Matthew, 1885. Pl. x, fig. 14. 
Diagnosis. —Head elongate, semi-elliptical, with straight sides 
and angulated behind. Dorsal furrow distinct. Marginal fold 
and groove rather flat and broad. Glabella subconical, obtuse in 
front, expanded behind. Length about five-sevenths of that of 
the head. The anterior lobe of the glabella is about two-fifths 
of its length; it is elliptically rounded in front, and obtusely 
behind; the posterior lobe is narrowed behind, and in that part is 
decidedly elevated above the rest of the head; a sigmoid furrow 
cuts off a depressed basal lobe on each side. The cheeks are 
moderately elevated, and of equal width all around the glabella. 
The thorax consists of two segments, the first is divided into 
three lobes of which the outer pair is globose, the axis is elon- 
gated, transverse and indented on the front side by two strong 
furrows extending $ way across; the second segment is similar to 
the first, except that there are no grooves on the axis. 
The pygidium is subquadrate, and armed with two lateral 
spines; its width one-fifth greater than its length. Axis cylin- 
dro-conical, obtusely pointed behind, and bears an elongated 
tubercle pointed backwards. The side lobes of the pygidium are - 
about 5 the width of the axis and narrowed towards the posterior 
end of the pygidium, where they connect. The marginal furrow 
