F. R. Cowper Reed— Fossils from Dufton Shales. 215 
completely circumscribed, except first pair. Basal lobes large, oval, 
swollen, half the length and one-third the width of the glabella, and 
placed parallel to its longitudinal axis. Middle lateral lobes sub- 
circular, invading sides of axial lobe of glabella. Anterior lateral 
lobes very small, imperfectly separated from anterior lateral angles of 
axial lobe. Axial lobe of glabella sub-cylindrical, rather more than 
one-third the width of glabella at base, expanding again between 
basal and middle lateral lobes and again in front, with anterior lateral 
angles small and overhanging anterior lateral lobes; anterior end of 
glabella sub-truncate. 
Fixed cheek narrow, curved, convex, rounded, increasing slightly 
in width posteriorly, embracing side of glabella back to eye, where it 
has about one-fifth the basal width of the glabella; behind eye 
descends steeply to narrow neck-ring ; posterior lateral wing of fixed 
cheek somewhat flattened, extending horizontally outwards to facial 
suture. Ocular ridge forming very narrow rounded band outside fixed 
cheek, running back to eye. Eyes small, situated very far back, lying 
behind the middle of basal lobes of glabella, and at about two-thirds 
their width from axial furrows. Facial sutures curving steeply back- 
ward to eyes, running almost parallel to axial furrows; behind eyes 
bending out very sharply (nearly at right angles to anterior branch) 
to follow a course nearly parallel to posterior margin of head-shield 
before curving back to cut this margin at a distance from the axial 
furrows nearly equal to width of glabella. 
Occipital segment forming broad flattened band projecting behind 
cheeks, and having a width equal to nearly one-third the length of 
the glabella, narrowing laterally behind basal lobes where it rises into 
a pair of small oval nodules. Occipital furrow strong, straight. 
Neck-segment very narrow. Free-cheek triangular, convex, sloping 
down from eye to concave marginal part, with strong raised narrow 
angulated border, bearing about twelve equidistant recurved short 
spines, successively increasing in length towards genal angle. Whole 
surface of head-shield tuberculated. 
Pygidium (imperfectly known), broadly semicircular, with strongly 
convex prominent short sub-cylindrical axis, one-third the width of 
pygidium and not reaching posterior margin, composed of two distinct 
rings (with traces of a third) of which the first is by far the most 
prominent, and is ornamented with a single row of tubercles. Margin of 
pygidium armed with five pairs of spines, of which the first two 
pairs are small, short, slender, sub-equal, and directed radially out- 
wards (these are somewhat indistinct and uncertain); third pair 
stouter and longer than the rest, nearly as long as pygidium, slightly 
divergent and connected as curved ridges across lateral lobes with 
first axial ring; two posterior and inner pairs of spines sub-parallel, 
slender, sub-equal, and directed backwards. 
Dimensions, Length of head-shield . 
Width of glabella 
Length of glabella : : 
Length of pygidium (without spines) 
wna aos 
SHnoOs 
Remarks,—T wo good head-shields, one free-cheek, and a somewhat 
