136 RESEARCH IN CHINA. 
fig. 8a (bed 20), p. 28], on the southeast slope of Hu-lu-shan, 2.5 miles (4 km.) south- 
west of Yen-chuang, Sin-t’ai district, Shan-tung, China. 
Collected by Eliot Blackwelder. 
Ptychoparia (Emmrichella) eriopia (Walcott). 
Plate 13, Figures 4, 4a. 
Anomocare eriopia WALCOTT, 1906, Proc. U.S. Nat. Mus., vol. xxx, p.582. (Discussed as a species of 
Anomocare.) 
This species was first placed under the genus Anomocare, but with the grouping 
of species under a subgenus of Piychoparia, that have a cranidium somewhat similar 
to that of P. (Emmrichella) theano [plate 13, fig. 2], the species eriopia appears to 
belong with them. In form of the frontal limb and rim and the posterior position of 
the palpebral lobes it is close to P. (E.) theano [fig. 2]. Its glabella is more like that 
of P. (E£.) mantoensis [fig. 1]. 
Formation and Locality.—Middle Cambrian: (C23) Upper part of thin-bedded 
gray oolitic limestone at the base of the Ch’ang-hia formation [Blackwelder, 1907a, 
p. 32 (second list of fossils), and fig. 6 (bed 20), p. 25], 50 feet (15 m.) below the base 
of the cliffs 1 mile (1.6 km.) east-southeast of Ch’ang-hia, Shan-tung, China. 
Collected by Eliot Blackwelder. 
Ptychoparia (Emmrichella) mantoensis (Walcott). 
Plate 13, Figures 1, 1a—c. 
Ptychoparia mantoensis WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxrx, p. 79. (Described as a 
new species as below.) 
Only the central portions of the moderately convex cephalon of this species are 
definitely known. It is characterized by the broad frontal space and flat frontal 
rim. ‘The sides of the glabella converge slightly toward the front margin, which is 
broadly rounded; glabellar furrows indicated by three very faint depressions on each 
side; occipital furrow relatively shallow and rounded. 
Fixed cheeks rather broad; the eye-lobe occupies the central third of the distance 
from the posterior margin to the anterior flattened rim; palpebral ridges not strongly 
marked. ‘The outlines of the free cheeks and the course of the facial sutures are 
shown in the outline figures. 
Surface slightly roughened by almost microscopic, irregular, raised lines. 
An associated free cheek has a long, slender postero-lateral spine. 
Formation and Locality.—Lower Cambrian: (C20) Central part of the Man-t’o 
shale formation [Blackwelder, 1907a, p. 26 (last list of fossils), and fig. 6 (bed 14), 
p. 25], on the west side of an isolated butte 1 mile (1.6 km.) south of Ch’ang-hia, 
Shan-tung, and (C81) gray crystalline limestone in the central portion of the 
Man-t’o shales [idem (first list of fossils), and fig. 6 (bed 12), p. 25], at Ch’ang-hia, 
Shan-tung, China. 
Collected by Eliot Blackwelder. 
Ptychoparia (Emmrichella) theano (Walcott). 
Plate 13, Figure 2. 
Ptychoparia theano WALCOTT, 1905, Proc. U.S. Nat. Mus., vol. xxix, p.82. (Described and discussed 
as below.) 
Cephalon small, moderately convex. Glabella subquadrilateral, moderately 
convex, a little narrower in front than at the base, and without glabellar furrows; 
occipital ring practically a continuation of the glabella, as the shallow occipital 
furrow barely indicates it; dorsal furrow narrow at the sides of the glabella, and 
very obscure in front of it. 
