Vol I. 



Grahau — Ordovician Fossils from North China (i) 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, hut it must he clearly understood 

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

 erosion, and that beds of late PaJa-ozoic age usually Lower (;a.rl)oniferous or Dinantian, 

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

 ferous beds rest upon them. Thus the fossihferous upper beds are proljably not always of 

 the same horizon, though it is possible that Adinoceras may have only a hmited vertical 

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

 in amount. 



FAUyA OF THE MACHIAKOU OR ACTLXOCERAS LIMESTONE 



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

 or Actinoceras limestone *). 



BRACHIOPODA 



1 OrtJds calligrmnvia Dalm. var. orthamhonites (de Xern.), Chihli 



* 2 Ori/iisf sp., Shantung (Weller) 



* 3 Dalmanella cf. testvdinarla Dalm., Shantung (Crick, Frccli) 

 4 StrojjJiojnena cf. incvrvafa (She])ar(l), Chiiili 



* 5 ySYro/^'/tomcHa sp., Shantung (Welk'r) 



* 6 Pledamhonites sericeios (How.), Shantung (Lorenz) 



PELECYPODA 



7 Ctenodonta symmetrica Grabau, Chihji 

 GASTROPODA 



* 8 Madureaf or Helicotojna? sp. , Shantung (\Veller) 



* 9 Madwea logani Salter, Shantung (Lorenz) 



10 Ecci/lioptenos hcshanensis Grabau, Chihli 



11 Eccyliomphalus tangshanensis Grabau, Chihli 



12 Lophospira morrisi Grabau, Chihli 



13 Lophospira piddielli for in is Grabau, Chihli 



14 Lophospira trodtij'ormis Grabau, Chihli 



15 Lophospira aada Gral>au, Chihli 



16 Lophospira gcrardi Grabau, Cliihli 



17 Lophospira gerardi var. laxa Graljau, Chihli 



*). Th3 species prooeded by and asterisk are recorded by Crick, Weller, loreaz, Frecli etc. from Shantung and one 

 Noi 34, from Manchuria. All of these, except the last, I have not seen. 



