154 RESEARCH IN CHINA. 
Surface finely punctuate under a strong lens. The largest cephalon in the col- 
lection has a length of 6 mm. 
This species is characterized by the tumid frontal limb and the ridge within 
the palpebral lobe on the fixed cheek. 
Formation and Locality—Middle Cambrian: (C70) Oolitic limestone about 30 
feet (9 m.) above the base of the Ki-chéu limestone [Willis and Blackwelder, 1907, 
p. 144 (last list of fossils)], 4 miles (6.4 km.) south-southwest of Tung-yii, Shan-si, 
and (C75) limestone near the base of the Ki-chéu formation [idem, p. 143], 4.5 
miles (7.2 km.) south of Wu-t’ai-hién, Shan-si, China. 
Collected by Eliot Blackwelder. 
Inouyia ? regularis (Walcott). 
Plate 14, Figure 18. 
Agraulos regularis WALCOTT, 1906, Proc. U.S. Nat. Mus., vol. xxx, p. 578. (Species described essen- 
tially as below.) 
This species is represented by a few specimens of the central portions of the 
cephalon, exclusive of the free cheeks. These indicate that the cephalon was rather 
strongly convex, and semicircular in outline. Glabella convex, truncato-conical, 
rounded in front, and with traces of two pairs of short glabellar furrows that divide 
it into three subequal portions; occipital furrow narrow but clearly defined; occip- 
ital ring narrow at the sides, increasing slightly in width toward the center, where 
it rises to form the base of a small node; dorsal furrow deep and rather broad. 
Fixed cheeks convex, rising abruptly from the dorsal furrow, the posterior 
furrow of the cephalon, and the anterior margin; in front they merge into the 
rounded, convex frontal limb with a trace of an intervening furrow and narrow 
palpebral ridge; palpebral lobes small and situated opposite the central portion 
of the glabella. 
Surface, under a strong lens, shows traces of being very finely punctate. The 
average length of three specimens of the cephalon is 2 mm. 
The cephalon representing this species has the rounded, full fixed cheeks and 
frontal limb of Inoujia ? acalle [p. 150], but it differs in having a proportionately 
shorter and broader glabella, and in being broader between the facial sutures. 
Formation and Locality—Middle Cambrian: (C73) Conglomeritic limestones 
near the top of the Ki-chdéu limestone [Willis and Blackwelder, 1907, p. 145 (fourth 
list of fossils)], 4 miles (6.4 km.) east of Fang-lan-chén, Shan-si, China. 
Collected by Eliot Blackwelder. 
Inouyia thisbe Walcott. 
Plate 14, Figure 21. 
Inouyia ? thisbe WaLcort, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, p. 81, plate 14, fig. 14. 
(Described and discussed as a new species essentially as below.) 
This species is represented by two broken specimens of the cranidium. These 
show that the glabella is much like that of Inouyia titiana (Walcott) [plate 14, 
fig. 9]; also the fixed cheeks and palpebral lobes. It differs in the transverse swelling 
of the frontal limb. In J. thisbe the frontal limb rises with a slight slope in front 
of the glabella, and curves gently downward to the margin without a trace of a 
frontal border as in Inouyia inflata (Walcott) [plate 14, fig. 10]. In J. titiana the 
frontal limb is abruptly convex and there is an almost flattened border. 
The surface of J. thisbe is distinctly punctate and in this respect resembles 
Agraulos dryas [plate 14, fig. 20]. 
The type specimen of the cranidium has a length of 5.5 mm. 
