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, 40. 



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 Ptychoparia, 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.~) thcaiw [fig. 2]. Its glabella is more like that 

 of P. (.) mantoensis [fig. i]. 



Formation and Locality. Middle Cambrian: (023) Upper part of thin-bedded 

 gray oolitic limestone at the base of the Ch'ang-hia formation [Blackwelder, 19070, 

 p. 32 (second list of fossils), and fig. 6 (bed 20), p. 25], 50 feet (15 m.) below the base 

 of the cliffs i mile (1.6 km.) east-southeast of Ch'ang-hia, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Ptychoparia (Emmrichella) mantoensis (Walcott). 

 Plate 13, Figures i, ifl c. 



Ptychoparia mantoensis WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, 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: (020) Central part of the Man-t'o 

 shale formation [Blackwelder, 190712, p. 26 (last list of fossils), and fig. 6 (bed 14), 

 p. 25], on the west side of an isolated butte i mile ( 1.6 km.) south of Ch'ang-hia, 

 Shan-tung, and (031) 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. 



