^^^' ^ C. C. Yu--Ordovician Cephalopoda of Central China (ii) 15 



(b). Lower Ordovician limestone 



Proterocameroceras mathieui Grabau. 

 Cameroceras styliforme Grabau 

 Chihliocerqs nathani Grabau 

 Chihlioceras chingwangtaoense Grabau 

 Piloceras platyventrum Grabau 

 Suecoceras yehliense Grabau 

 Suecoceras attenuatum Grabau, 



b. Mr. T, K. Huang had gathered some cephalopods from Hsi-shan or Western 

 Hills of Peking'. 



(a) Machiakou limestone 



Stereoplasmoceras pseudoseptatum Grabau 

 Actinoceras coulingi Grabau 

 Actinoceras suanpanoides Grabau 



(b) Peilintze limestone 



Proterocameroceras minor Grabau 

 Proterocameroceras mathieui Grabau 

 Piloceras platyventrum Grabau 

 Chihlioceras nathani Grabau 

 Chihlioceras sp. 



3. In Shantung 



Many cephalopods have been obtained. These were described by several authors. 



a. Samuel Couling had collected from the locality near Ching Chow Fu, Kiao- 

 chow, two different forms of cephalopods which G. C. Crick^ described as 

 those named below. Prof. Grabau, 3 however, considered them the same as 

 the forms in brackets from the Machiakou formation. 



Actinoceras (Ormoceras) aff. tenuifilum Hall {= Actinoceras cou- 

 lingi Grabau). 



Gonioceras sp. (cf. Gonioceras shantungense Grabau). 



1. T. K. Huang: On the Cambrian and the Ordovician Formations of Hsishan or Western 

 Hills of Peking. Bulletin of the Geological Society of China, Vol. VI, No. 2. 



2. G. C. Crick: Straight shelled Nautiloidea from North China. Geol. Mag. London., N. S., 

 dec. IV, Vol. X, P. 481. 



3. A. W. Grabau: Loc. cit, pp, 83, 84, 91-93. 



