162 RESEARCH IN CHINA. 



rounded furrow within the narrow, slightly elevated posterior margin; frontal rim 

 rounded, narrow, and separated from the glabella by a strong, rounded, rather deep 

 furrow, which becomes more shallow in front of the fixed cheeks. 



Surface marked by numerous, medium-sized punctae, with very fine punctae, 

 visible only under a strong lens, between them. 



The largest cephalon of the species has a length of 5.5 mm., with a width at the 

 palpebral lobes of 8 mm. ; the glabella has a length of 3 mm., with a width of 2.5 mm. 



This species differs from the other species of the genus in its shorter, broader 

 glabella, and more convex fixed cheeks. 



Formation and Locality. Upper Cambrian: (041) Lower part of the Ch'au- 

 mi-tien limestone [Blackwelder, 19070, p. 36 (part of the first list of fossils)], 2.7 miles 

 (4.3 km.) southwest of Ch'au-mi-tien, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Pagodia lotos Walcott. 

 Plate 15, Figures 12, 120. 



Pagodia lotos WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 64. (Described and discussed as a 

 new species essentially as below.) 



Glabella moderately convex, elongate, with the sides converging very slightly 

 toward the broadly rounded front ; obscure traces of two pairs of furrows that extend 

 a short distance inward and backward occur upon the sides ; occipital furrow strong, 

 rounded, and arching slightly forward at the center; occipital ring of medium width 

 and rounded; dorsal furrow strong but shallow, and merging into the transverse 

 furrow in front of the glabella. 



Fixed cheeks about one-half the width of the cephalon opposite the palpebral 

 lobes, slightly convex, and sloping gently posteriorly to the furrow within the mar- 

 gin, and anteriorly to the transverse furrow within the frontal rim; palpebral lobes 

 small, short, not much more than one-fifth the length of the cephalon; a very slight 

 trace of a palpebral ridge is shown upon the cast of the interior of the crust, but no 

 evidences of it have been seen on the outer surface ; frontal rim narrow, rounded so 

 as to give it a thickened appearance, with a slightly flattened slope into the furrow 

 back of it ; it is separated from the glabella and fixed cheeks by a sharp furrow that 

 almost cuts back under the front of the glabella. 



The crust is thick ; it appears to be smooth on the outer surface over the gla- 

 bella and fixed cheeks, with the exception of scattered, shallow punctae. 



The type specimen has a length of 6 mm., with a width at the palpebral lobes 

 of 8 mm. 



The associated pygidium is convex, subsemicircular in outline, and strongly 

 trilobed, except at the margin. Axial lobe convex, conical, and divided by three 

 transverse furrows into three rings and a terminal, rounded, subtriangular portion. 

 Pleural lobes nearly flat toward the front near the dorsal furrow, and from there 

 curving abruptly downward toward the side and posterior margins; the furrows of 

 the axis extend about two-thirds of the distance across the pleural lobes and merge, 

 with the flat segments between them, into the margin; the margin slopes up from the 

 sharp outer edge with a slight concavity where it merges into the pleural lobes and 

 touches the posterior end of the axis. 



This species differs from Pagodia macedo [p. 163] and P. dolon [p. 161] in its 

 frontal rim and the slight convergence of the sides of its glabella toward the front. 

 It is most nearly related to Pagodia bia [p. 161], with which it is associated. The 

 latter species differs from P. lotos in its narrower and proportionately longer gla- 



