294 RESEARCH IN CHINA. 
of the Baltic provinces of Russia. These two formations are essentially 
equivalents of American faunas included in the Mohawkian division of the 
Ordovician, and we recognize in this Chinese fauna several species among 
the brachiopods which are identical with or closely allied to North American 
Mohawkian forms. ‘The fauna presents in its entirety a mingling of Baltic 
and North American forms, although the Baltic element is much the more 
pronounced. In age the fauna is clearly not younger than the Mohawkian 
faunas of North America, and it may be safely considered as the essential 
time equivalent of the Black River limestone of North America and of the 
Vaginatus limestone of Russia. 
EXPLANATION OF PLATE 25. 
1I— 2. Strophomena sp. undt. Weller (p. 281). 12-16. Dalmanites testudinaria (Dalman) (p. 283). 
3- 6. Orthis calligramma Dalman (p. 282). 17-18. Clitambonites chinensis Weller (p. 283). 
7— 9. Triplecia polot (Martelli) (p. 281). 19-20. Dalmanella subequata (Conrad) (p. 283). 
10-11. Plectorthis willisi Weller (p. 283). 21-24. Hemipronites tenutstriata Weller (p. 284). 
EXPLANATION OF PLATE 26. 
1. Cornulites sp. undt. Weller (p. 285). rie Proetus? sp. undt. Weller (p. 289). 
2. Crytodonta ? sp. undt. Weller (p. 285). Te Pterygometopus ? sp. undt. Weller (p. 289). 
3-4. Asaphus sp. cf. A. expansus Dalman (p. 287). 12: Tsotelus ? sp. undt. Weller (p.288). 
5. Asaphus asiaticus Weller (p. 287). 14. Asaphus sp. undt. Weller (p. 288). 
6. Asaphus levis Weller (p. 287). 15. Isotelus sp. undt. Weller (p. 288). 
7. Asaphus chinensis Weller (p. 287). 16. Ampyx chinensis Weller (p. 285). 
8. Megalaspis minor Weller (p. 288). 17-18. Bathyurus sp. undt. Weller (p. 285). 
9g. Asaphus sp. undt. Weller (p. 288). 19-20. Asaphus taningensis Weller (p. 286). 
10. Illenus ? bronteoides Weller (p. 289) 21-22. Asaphus blackweldert Weller (p. 286). 
