58 RESEARCH IN CHINA. 



slatkowskii Schmidt and Solenopleura ? sibirica Schmidt. The species of Do- 

 rvpvge is quite unlike Dorypyge richthofeni Dames from the Middle Cambrian 

 of Shan-tung, and the Solenopleura ? sibirica has no representative in the 

 Chinese Cambrian fauna. 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 Rcdlicliia 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 Inouyia 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 

 czekanowskii von Toll [1899, plate i, fig. i] is exceedingly close to Levisia 

 agenor (Walcott) [plate 14, fig. 19]; and Ptychoparia meglitzkii von Toll 

 [1899, plate i, fig. 2] has the broad, swollen anterior limb, broad free cheeks, 

 and conical glabella of some of the Inouyia [plate 14, figs. 9, 12, 13, 15]. 

 Von Toll describes three species of Microdiscus and Agnostus schmidti from 

 the Lena limestone; also a species of Hyolithes, 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 Anomocarc pawlowskii and Liostracns ? maydeli, 

 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. 



