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 glabella. 



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 it is 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 pleurae; 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 



