112 RESEARCH IN CHINA. 



bellar furrows are indicated by slight, short depressions at the sides next to the 

 dorsal furrow; back of the posterior pair of depressions a low, rounded ridge extends 

 out onto the fixed cheek, forming a low, oval-shaped tubercle or lobe that is appar- 

 ently the continuation of the postero-lateral lobe of the glabella ; a small pit occurs 

 just back of it, from which the occipital furrow starts; the latter is shallow, clearly 

 defined, and extends slightly backward and then forward toward the center; occip- 

 ital ring of medium width at the sides, broadening out to a somewhat flat, rather 

 strong segment at the center; dorsal furrow obscure, and interrupted by the small 

 lobe at the postero-lateral angle of the glabella, and by the palpebral ridge at its 

 antero-lateral angle. 



Fixed cheeks about two-thirds the width of the central portion of the glabella ; 

 they rise somewhat rapidly from the dorsal furrow to the palpebral lobe, and slope 

 gently back to the posterior furrow and, in front of the palpebral ridge, rather rap- 

 idly to the furrow within the frontal rim; palpebral ridges strong and rather promi- 

 nent ; they originate against the antero-lateral angle of the glabella, extend obliquely 

 backward across the fixed cheek, and merge into the rim of the palpebral lobe; 

 palpebral lobe elevated above the fixed cheek, prominent, and about one-third of 

 the entire length of the cephalon ; a shallow groove extends from the thick, strong, 

 broad, elevated rim down to the fixed cheek ; postero-lateral limb about as long from 

 the dorsal furrow to its extremity as the length of the glabella and occipital ring; 

 a narrow furrow within the sharp posterior margin gives it an almost concave form ; 

 frontal border transverse or slightly incurved; it is elevated, rounded, and separated 

 from the front of the glabella by a narrow, sharply defined furrow that extends 

 outward and slightly forward between the rim and the fixed cheeks; it is nearly 

 flat, broad at the center, narrowing toward the facial suture. 



The associated free cheek is subrhomboidal in outline, with a narrow rim that 

 is slightly flattened in front, becoming more rounded toward the postero-lateral 

 angle, which has a short, sharp, backward-extending spine; the body of the cheek 

 is slightly convex, rising broadly from the border to the base of the eye-lobe; the 

 posterior border is short, being cut a short distance within the postero-lateral angle 

 by the facial suture; the facial sutures, cutting the frontal limb, extend directly back- 

 ward, with a slight outward curve, to the eye-lobe, around which they curve; back 

 of the eye-lobe the sutures continue with a slight sigmoid flexure outward and back- 

 ward, cutting the posterior margin a short distance within the postero-lateral angle. 



The associated pygidium, which is doubtfully referred to this species, is trans- 

 versely semicircular, with a short, conical, convex axis; the axis is divided by two 

 narrow, shallow, transverse furrows into two anterior segments and a terminal 

 segment about as long as the two anterior segments. Pleural lobes depressed, 

 nearly flat for a short distance, and then sloping gently down to a narrow, flattened 

 margin ; they are marked by three shallow furrows, which separate a strong, anterior, 

 narrow, elevated rim, two slightly convex segments, and a posterior segment at 

 the end of the axis; the furrows and segments stop at the line of the flattened margin, 

 with the exception of the anterior elevated rim, which continues across the margin 

 and is extended into a strong spine that curves outward and backward ; the border 

 is narrow, slightly flattened, and transverse, but somewhat incurved posteriorly; 

 it has four or more short, broad, backward-extending spines. 



The surface of the central portions of the cephalon is apparently smooth under 

 a strong lens, with the exception of a few scattered, depressed tubercles; the free 

 cheeks have a few irregular, raised, inosculating lines extending from the base of the 

 eye outward toward the rim ; the surface of the associated pygidium appears to have 

 a very few minute tubercles that can be seen only with the aid of a very strong lens. 



