Vl I. dralxni Ordovician Fossils from North China (l) 7 



from south Chihli, from various parts of Shantung and from Manchuria. The fossils so far 

 obtained from it occur in the upper 10 to 15 meters, but it must be clearly understood 

 that over this entire region of its known-exposure it has suffered pre-Carboniferous 

 erosion, and that beds of late Palaeozoic age - usually Lower Carboniferous or Dinantian, 

 but sometimes Upper Carboniferous or Uralian and in some cases perhaps Permo-Carboni- 

 ferous beds rest upon them. Thus the fossiliferous upper beds arc probably not always of 

 llu- same horizon, though it is possible that Actlnoceras may have only a limited vertical 

 range, in which case the pre-Carboniferous erosion over wide areas was relatively uniform 

 in amount. 



FAUXA OF TIIK MACHIAKOU OR ACTIXOCERAS L1MKSTOXE 







The following species have been obtained from the upper part of the Machiakou 

 or Actinoceras limestone *). 



BRACHIOPODA 



1 Ortltis calliyramtna Dalm. var. orthambonites (de Vern.), Chihli 



* 2 Urtliisf sp., Shantung (VVeller) 



3 Dalmanella cf. testudinaria Dalm., Shantung (Crick, Freeh) 



4 Strophomena cf. inciirvata (Shepard), Chihli 



* 5 Strophomena sp. , Shantung (Weller) 



* 6 Plectambonites sericeus (Sow. ), Shantung (Lorenz) 



PELECYPODA 



7 Ctenodonta symmetrica Grabau, Chihji 

 GASTROPODA 



* 8 Maclurea? or Hdwotomaf sp., Shantung (VVeller) 



* 9 Maclurea logani Salter, Shantung (Lorenz) 



10 Eccylioptcrus kushanensis Grabau, Chihli 



11 Eccyiiomphalus tangshanensis Grabau, Chihli 



12 Lophospira morrisi Grabau, Chihli 



13 Lophospira pulchelliform is Grabau, Chihli 



14 Lophospira trochiformis Grabau, Chihli 

 1") Lophospira acuta Grabau, Chihli 



16 Lophospira gerardi Grabau, Chihli 



17 Lophospira gerardi var. laxa Grabau, Chihli 



*). Ths species preceded by and asterisk are recorded by Crick, Weller, lorenz, Kreclielc. from Shantung and one 

 No. 34, from Manchuria. All of these, except the last, I have not seen. 



