184 RESEARCH IN CHINA. 
Fixed cheeks narrow, rising abruptly from the dorsal furrow and extending 
laterally to the furrow within the rim of the palpebral lobe; they slope gently back- 
ward to the postero-lateral limb, and more abruptly forward to a strong furrow 
that separates the frontal, rounded margin of the cephalon from the glabella; 
frontal limb and rim combined in a rounded frontal border, which corresponds in 
its section to about the same curvature as the section of the furrow between the 
border and the glabella; postero-lateral limbs about as long as the width of the 
glabella, and marked by a broad, rather deep groove within the narrow posterior 
margin. 
Surface of the cast of the interior of the test with numerous rather large, 
scattered puncte, and very fine puncte seen only with the aid of astrong lens; a 
fragment of the outer surface shows it to have been strongly punctate, with fine 
puncte corresponding to the puncte seen on the interior. 
The largest cephalon in the collection has a length of 13 mm. 
This species is strongly characterized by the broad, strong posterior furrow and 
narrow posterior lobe of the glabella, and the subquadrate, moderately convex 
frontal lobe; also the elevated occipital ring and punctate surface. 
Formation and Locality—Upper Cambrian: (C64) Upper limestone member 
of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 42 (first list of fossils), and 
fig. 10 (bed 20), p. 38], 2.7 miles (4.3 km.) southwest of Yen-chuang, Sin-t’ai district, 
Shan-tung, China. 
Collected by Eliot Blackwelder. 
Ptychaspis calyce Walcott. 
Plate 16, Figures 15, 15a. 
Ptychaspis calyce WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxx, p. 72. (Characterized as a new 
species as below.) 
In general form, convexity, and size the corresponding parts of this species 
follow those of P. ceto [plate 16, fig.17]. It differs fromthe latter inhaving a strongly 
pustulose surface instead of irregular, more or less concentric ridges and furrows. 
The largest specimen of the cephalon in the collection has a length of 17 mm. 
Formation and Locality—Upper Cambrian: (C42) In the central part of the 
Ch’au-mi-tién limestone [Blackwelder, 1907a, p. 36 (second list of fossils)], 1.8 miles 
(2.9 km.) west-southwest from the temple on Tsing-lung-shan, 7.5 miles (12 km.) 
east of Ch’au-mi-tién, Shan-tung; also (C64), upper limestone member of the Kiu- 
lung group [idem, pp. 37 and 42 (first list of fossils), and fig. 10 (bed 20), p. 38], 2.7 
miles (4.3 km.) southwest of Yen-chuang, Sin-t’ai district, Shan-tung, China. 
Collected by Bailey Willis and Eliot Blackwelder. 
Ptychaspis campe Walcott. 
Plate 16, Figure 16. 
Ptychaspis campe WALcort, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 73. (Described as a new 
species essentially as below.) 
This species is represented by a fragment of a small cephalon that is so distinct 
in its surface granulation, large eye-lobe, and frontal portion of the cephalon that it 
can not be readily confused with any other species. The glabella is divided by two 
narrow, transverse, slightly backward curving furrows into two narrow lobes and a 
large anterior lobe that is marked by two pairs of short, very narrow furrows on the 
lateral slopes; the anterior lobe is about as long as wide, slightly convex behind and 
