Fig. 10. Cyrtactinoceras frechi Grabau p. 89 



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

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

 Ch. Cat. No. 72). 



Fig. 11. Gonioceras shantungense Grabau p. 92 



11a. Polished section of the holotype and only known specimen. Natural size. The 

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

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

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

 S. Ch. Cat. 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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