134 RESEARCH IN CHINA. 
Ptychoparia ? tolus Walcott. 
Plate 12, Figure 13. 
Ptychoparia tolus WaucorTt, 1905, Proc. U.S. Nat. Mus., vol. xxix, p. 82. (Described as in first 
paragraph below.) 
Of this species only a single, fragmentary cephalon in known; this is much 
like the corresponding parts of the cephalon of Anomocarella thraso, but it differs 
(a) in being less convex, (b) in having a more coarsely granulated surface, (c) stronger 
posterior glabellar furrows, (d) broader fixed cheeks, and (¢) more broadly rounded 
front to the glabella. The length of the cephalon is 10 mm.; of the glabella, 7 mm.; 
width of the cephalon, including palpebral lobes but not fixed cheeks, 12 mm. 
The strong granulation on the surface indicates that P. ? tolus will be found to 
belong to some other genus than Ptychoparia when the entire dorsal shield is known. 
Formation and Locality.—Middle Cambrian: (C52) In the lower part of the 
limestone member of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 39 (second 
list of fossils), and fig. 7 (bed 22), p. 27], near base of cliffs in mountain 1,000 feet 
(305 m.) high, 3 miles (4.8 km.) north-northeast of Sin-t’ai-hién, Shan-tung, China. 
Collected by Eliot Blackwelder. 
Ptychoparia typus (Dames), 
Plate 12, Figures 14, 14a-—c. 
Conocephalites typus DAMES, 1883, China, Richthofen, vol. rv, p. 11, plate 2, figs. 11, 12. (Described 
and figured.) 
Of this species only the central portions of the cephalon and pygidium are 
known. ‘These were described and illustrated by Doctor Dames and in this paper 
examples from the shale are figured. 
Formation and Locality —Middle Cambrian: (350) Fu-chéu series, shales about 
130 feet (40 m.) above the white quartzite [see Blackwelder, 1907), p. 92, for general 
section giving stratigraphic relations]; collected in drainage cuts a short distance 
back from the bluff [see 35n] forming the shore of Tschang-hsing-tau Island, 
east of Niang-niang-kung, Liau-tung, Manchuria, China. 
Collected by J. P. Iddings and Li San. 
EMMRICHELLA Walcott, subgenus of PTYCHOPARIA. 
Emmrichella WALCOTT, 1911, Smithsonian Mise. Coll., vol. 57, No. 4, p.79. (Described and discussed 
as a new genus essentially as below.) 
This subgenus differs from Ptychoparia in its smooth glabella and larger pal- 
pebral lobe; from Liostracus in having an arched or nearly flat frontal limb and 
rim and more convex cranidium; from Conokephalina in its smoother glabella 
and wider fixed cheeks; and from Anomocare in its smoother glabella, usual absence 
of distinct palpebral ridge, and proportionately shorter eye-lobes and glabella. 
Genotype.—Ptychoparia theano Walcott.! 
This subgenus is characterized by a nearly smooth surface on the glabella 
and fixed cheeks, rather large palpebral lobes, and narrow postero-lateral limbs. 
Unfortunately, no entire specimens of the cephalon and thorax are known, and the 
pygidia referred to it may or may not belong to the species to which they are tenta- 
tively assigned. Only when a thorough study is made of all the material within 
the Conokephaline will it be possible to make even a fairly adequate grouping of 
the species. 

lWalcott, 19050, Proc. U. S. Nat. Mus., vol. 29, p. 82; Idem, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, 
plate 14, figs. 9 and 9a. 
