58 RESEARCH IN CHINA. 
slatkowskii Schmidt and Solenopleura ? sibirica Schmidt. ‘The species of Do- 
rypyge is quite unlike Dorypyge richthofent Dames from the Middle Cambrian 
of Shan-tung, and the Solenopleura ? sibirica has no representative in the 
Chinese Cambrianfauna. He also places Microdiscus lenaicus von Toll in the 
Lower Cambrian along with the Torgoschino limestone fauna [von Toll, 1899, 
p. 54]. I see no objection to this arrangement, but I would place the fauna 
as of late Lower Cambrian age. This would bring it in point of time in cor- 
relation with the Redlichia fauna of the Shan-tung and Punjab provinces. 
The Siberian fauna, however, is that of the Lower Cambrian of Australia, 
Sardinia, and North America. ‘This leads to the conclusion that the Siberian 
province was quite distinct in Lower Cambrian time from the Shan-tung and 
Punjab provinces, and that, as von Toll so well states, “The Sinio-Siberian 
sea stood on the one hand in connection with the Pacific-American and on 
the other with the Atlantic-European.”’ [Von Toll, 1899, p. 56.] 
In Middle Cambrian time a group of trilobites lived in the Shan-tung sea 
that I have illustrated on plate 15 under the genera /nouyia and Levisia. 
Among the species described by von Toll from the limestone on the Lena 
river is one that appears to come within the genus Levisia. Ptychoparia 
czekanowskit von Toll [1899, plate 1, fig. 1] is exceedingly close to Levisia 
agenor (Walcott) [plate 14, fig. 19]; and Ptychoparia meglitzkii von ‘Toll 
[1899, plate 1, fig. 2] has the broad, swollen anterior limb, broad free cheeks, 
and conical glabella of some of the Jnouyia [plate 14, figs. 9, 12, 13, 15]. 
Von Toll describes three species of Microdiscus and A gnostus schmidti from 
the Lena limestone; also a species of Hvyolithes, fragments of a trilobite 
doubtfully referred to Olenellus, and two brachiopods, Kutorgina cingulata 
Billings and ? Obolella cf. chromatica Billings. 
The general facies of this Lena limestone fauna led von Toll to place it 
in the Lower Cambrian, but in the absence of forms that are distinctly of 
Lower Cambrian age there remains a doubt. In any event the fauna is, 
with the exception of the two trilobites referred to Ptychoparia by von Toll, 
distinct from the fauna of the Shan-tung Province. 
The two species of trilobites described by Schmidt from the banks of the 
Wilui [von Toll, 1899, p. 3] as Anomocare pawlowskii and Liostracus ? maydelt, 
are clearly Middle Cambrian forms and comparable with species that I have 
referred to the genus Anomocarella [plate 19] in respect to their large 
eyes and broad glabella, but not in their narrow frontal limb and rounded 
frontal rim. ‘These trilobites indicate that in Middle Cambrian time there 
was no direct connection between the Shan-tung and Siberian provinces. 
