126 RESEARCH IN CHINA. 
Glabella large, truncato-conical in outline, and marked by three pairs of short 
furrows; the posterior pair of furrows forms a rounded pit near the margin, and con- 
tinues obliquely outward as a shallow furrow to the central third of the glabella, 
separating a short, rounded lobe on each side; the middle pair of furrows is short and 
very lightly impressed; the anterior pair of furrows is indicated by a short, smooth, 
narrow space at the anterior fourth of the glabella; occipital furrow of medium width, 
rounded at the bottom, and rather deep; it curves backward slightly at the sides and 
then arches gently forward at the middle; occipital ring of medium width, curving 
slightly backward at the ends and forward at the center, rounded on top; dorsal 
furrow strongly marked all about the glabella and passing posteriorly into a narrow 
but well-defined furrow within the posterior margin of the postero-lateral limb; the 
front of the glabella almost overhangs a strong furrow within the frontal border,that 
separates the frontal border from the fixed cheeks; frontal border or rim strong, 
rounded, and arching slightly upward in front of the glabeila. 
Fixed cheeks a little more than one-half the width of the glabella; they slope 
gently back to the furrow on the postero-lateral limb and rather rapidly downward, 
in front of the palpebral lobe, to the furrow within the frontal border; a clearly 
defined, low, rounded palpebral ridge extends opposite the anterior fourth of the 
glabella to the palpebral lobe, into the rim of which it merges; postero-lateral limb 
about one and one-third times as long as the width of the glabella at its base, and back 
of the palpebral lobe about one-third the length of the cephalon; palpebral lobe a 
little less than one-third the length of the cephalon, elevated at the outer rim, and 
rather narrow. ‘The facial sutures cut through the rounded frontal margin of the 
cephalon obliquely and then extend around backward, passing almost directly to the 
anterior margin of the palpebral lobe; curving around the rather small eye-lobe, they 
pass obliquely outward and backward, cutting the border of the head a little back of 
the postero-lateral angle. 
Free cheeks roughly subtriangular, with the outer margin bordered by a thick- 
ened, rounded rim, which gradually increases in width to the base of the long 
postero-lateral spine; back of the spine to the facial suture the border narrows 
rapidly ; the body of the cheek rises at a uniform slope to the base of the eye-lobe. 
Thorax with a convex axis that narrows gradually from the anterior segment, 
where the width is 15 mm., to the twelfth segment, where itis 12 mm. One speci- 
men preserves twelve segments, with the pygidium, and, it may be, other segments 
broken off. The segments are nearly transverse, except at the geniculation on the 
pleural lobes, where the falcate extremities bend slightly backward; pleural lobes 
flattened three-fourths of the distance out, where they curve slightly downward to 
the extremities of the pleure; pleural groove occupying nearly the entire width of 
the pleura, except near the axis, where it narrows toward the front margin; at the 
outer extremity it fades out where the pleura curves outward and backward. There 
is some difference in the strength and width of the pleural groove in different speci- 
mens; in some it has practically the same width from the axis out to its extremity, 
while in others it is narrow toward the axis and not quite so broad through the 
central portions. 
Pygidium large, semicircular; axial lobe divided by four well-defined transverse 
furrows, that arch slightly forward, into four moderately convex rings and a some- 
what elevated terminal portion, which has the appearance of a thickened ring with a 
strong node on each side of the center and a slightly defined furrow on its front slope; 
the terminal ring slopes rapidly downward to the border; lateral lobes broad, slightly 
convex, and marked by a narrow anterior ring, which joins the thorax, and four 
strong, rather broad furrows that separate three rings and a broad, obscure terminal 
