^2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



addition to sixteen species of the Archseocyathinse, two species of 

 trilobites, Dorypyge slatkowskii Schmidt and Solenopleura ? sibirica 

 Schmidt. The species of Dorypyge is quite unHke Dorypyge richtho- 

 feni Dames from the Middle Cambrian of Shan-tung, and the 

 Solenopleura ? sibirica has no representative in the Chinese Cam- 

 brian fauna. He also places Microdiscus lenaicus von Toll in the 

 L.owrer Cambrian along w^ith the Torgoschino limestone fauna.^ 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 correlation with the Redlichia fauna of the Shan-tung and 

 Pun-jab 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 Pun- jab provinces, 

 and that, as von Toll so well states, " The Sinio-Siberian sea stood 

 on the one hand in connection with the Pacific-Amercian and on 

 the other with the Atlantic-European." ' 



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 riveir is one that appears to come within the 

 genus Levisia. Ptychoparia czekanowskii von TolP is exceedingly 

 close to Levisia agenor (Walcott) [plate 14, fig. 19] ; and Ptycho- 

 paria meglitzkii von Toll * 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 f 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- 

 tune Province. 



' Toll, E. von. Mem. 1' Acad. imp. Sci. St. Petersbourg, 8th ser., vol. 8, No. 

 10, 1899, Beitrage zur Kentniss des sibirischen Cambrium, p. 54. 

 ^ Idem, p. 56. 

 ' Idem, pi. I, fig. I. 

 ^ Idem, pi. I, fig. 2. 



