Fig. 10. Cyrtactinocirax frcclti Grubau p. 89 



A polished section showing part of the curved siphuncle. Natural size. Machiakou 

 limestone, Ching-Chuang, Ning-Yang, Shantung. (Colype, V. K. Ting coll. G. S. 

 Ch. Cat. No. 72). 



Fig. 11. Gonioceras shantungensc Grabau p. 92 



1 la. Polished section of the holotype and only known specimen. Natural size. The 



section shows the siphuncle, empty caraeuc and incomplete septa. In the lower 



. right hand portion the lateral continuation of the septa is shown. Machiakou 



limestone, Seng-Chuang, Ning-Yang, Shantung. (Holotype, V. K. Ting coll., G. 



S. Ch. Cut. No. 10). 



lib. The lower part of the same specimen enlarged twice to show more fully the 

 geniculated portion ot the septa. 



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