32 BULLETIN" 16 4, UNITED STATES NATIONAL MUSEUM 



Grabau has described LopJiosfira and Liospira, together with 

 characteristic Bhick River fossils, from the Machiakou formation, 

 while Kobayashi identifies the same forms in the Toufangkou. The 

 vertical range of these genera is very great, extending from the 

 Canadian to the Richmond, but, since the gastropods found in the 

 Ordovician strata of North China and South Manchuria, as well as 

 North Korea, are more like those of the Mosheim stage of the Stones 

 River, and, furthermore, since I have possibly the identical species 

 in the Kangyao formation, my conclusion is that Grabau included 

 some Stones River in the base of his Black River Machiakou forma- 

 tion. Such a mistake is easily made, since all outcrops of Canadian 

 and Ordovician strata in both North China and South Manchuria 

 are deeply weathered limestones much obscured by talus, deep- 

 cultivated soils, or grassy slopes. Consequently the fossils are 

 usually collected from the talus or bowlders, which are liable to 

 lead one into serious error. This condition may therefore explain 

 the inclusion of the two faunas in the Machiakou of the Kaiping 

 Basin and further strengthen the view that the lower portion of 

 that formation may be equivalent to the Kangyao formation of 

 Manchuria. 



In Grabau's descriptions I have been unable to find any fossils 

 that may be referred to the Wuting fauna; consequently, accord- 

 ing to the evidence now available, it seems that rocks equivalent 

 to the Wuting are not developed in North China. This question, 

 however, needs further investigation in the field. On the other 

 hand, part of the Lingchiashan limestone and the Peilintze forma- 

 tion as developed in the Shih-men-chai region, northeastern Chihli, 

 apparently correlate with the Santao as indicated in the following 

 list of the identified species : 



Santao formation : 



Anthaspidellal radiata, new spe- 

 cies. 



Anthaspidcllal planulata, new 

 species. 



Hormotoma sp. 



Cameroceras styliforme Grabau. 



Piloceras mancliuHense, new spe- 

 cies. 



At first glance most of the fossils listed above seem to belong to 

 different species, genera, or families, with little or no real identity. 

 I believe, however, that a comparison of my specimens with 

 Grabau's, which are not too well illustrated, will show that his 

 Archaeocyathus, Fusispira, and Piloceras species are the same or 

 very closely related to those described by me under the genera 

 Anthas'pidella^ Ilormotoma^ and Piloceras. 



Peilintze limestone : 



Archaeocyathus cliiMiense Gra- 

 bau. 



Pusispira sp. 



Piloceras platyventrum Grabau. 

 Lingchiashan limestone: 



Cameroceras styliforme Grabau. 



Piloceras platyventrum Grabau. 



