212 RESEARCH IN CHINA. 



has the same characteristic surface marking. Glabella slightly convex and marked 

 by three pairs of very faintly indicated furrows; it has a length of 16 mm., with a 

 width of 12 mm. near the base; it narrows slightly toward the rounded front. A 

 fragment of the fixed cheek indicates that the latter was nearly flat between the 

 glabella and palpebral lobe; the frontal lobe is nearly flat for a distance of 4 mm., 

 when it slopes downward to the thickened frontal rim, no line of demarcation dis- 

 tinguishing the frontal rim. 



The free cheek indicates a moderate convexity for the cephalon ; also that the 

 margin, which is very narrow at the front, widens out gradually toward the postero- 

 lateral angle of the cephalon ; the base of the eye-lobe shows that the palpebral lobe 

 and eye were relatively small; the line of facial suture, as shown by the free cheek, 

 shows that the postero-lateral limb of the fixed cheek was large and more than half 

 the width of the cheek; also that the antero-lateral limb was strong. 



The surface of the glabella is marked by shallow pits varying greatly in size and 

 form; the pits are so closely crowded that the lines of the demarcation between 

 them in places form an irregular network; on the posterior portions of the glabella, 

 and on the frontal limb, the shallow pits are more or less scattered, giving a some- 

 what coarsely punctate appearance; the fixed cheeks and free cheeks are marked 

 by strong, but not large, pits or punctae, scattered somewhat thickly over the surface ; 

 the surface of the associated pygidium is much like that of the cheeks. 



The associated pygidium has a width of 26 mm. and a length of 12 mm. ; it is 

 moderately convex, with a prominent axial lobe and a broad, slightly concave border 

 that merges above the slightly convex pleural lobes. Axial lobe convex with the 

 elevated portion about five-sixths of the length of the glabella; it slopes abruptly 

 downward and backward from the elevated portion to a low, slightly convex termi- 

 nation near the posterior margin ; divided by five well-marked transverse furrows 

 that separate it into five segments and an obtuse terminal segment which has two 

 rather large, rounded nodes, outlined by a slight depression at the center; the 

 pleural lobes are grooved by the extension of the furrows crossing the axis; also by 

 pleural grooves, both of which extend outward across the pleural lobe and curve 

 backward across the broad, planulate border of the margin. 



Formation and Locality. Middle Cambrian: (C'2) Lower shale member of the 

 Kiu-lung group [Blackwelder, 19070, pp. 37 and 40 (part of the third list of fossils), 

 and fig. 10 (beds 4 and 5), p. 38], 2 miles (3.2 km.) south of Yen-chuang, Sin-t'ai 

 district, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Coosia decelus (Walcott). 

 Plate 21, Figure 8. 



Anomocare decelus WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix. p. 52. (Species described as 

 below. 



Of this species only the anterior central portions of the cephalon arc known. 

 It is characterized by a broad, nearly flat, frontal rim that, with the frontal limb in 

 front of the glabella, has a slightly convex slope interrupted only by a shallow, 

 narrow groove ; the frontal limb is ornamented with raised, narrow, irregular, more 

 or less inosculating lines that radiate from the front of the glabella and palpebral 

 ridges down to the narrow groove separating the limb from the frontal margin. 



The fixed cheeks are about half the width of the glabella ; they are nearly flat 

 and interrupted by a rather strong palpcbral ridge. The glabella is large, broadly 

 rounded in front, with the sides subparallel from opposite the center of the palpebral 



