with part of outline restored. This shell shows n more acute lateral angle (slightly 

 emphasized by compression, and a more nearly circular and proportionately large 

 siphuncle. Machiakou limestone, WSn-Nan, Mon-Yin-Hsien, Shantung. V. K. 

 Ting coll. (G. S. Ch. Cat. No. 108) . 



Fig. 9. Stereoplasmoccras aciinoccriforme Grabau p. 69 



9a. Section through siphuncle, showiug the filling of crystalline limestoue, but without 



regular arrangement as in Actinoccras. Natural size. 



9h. Lower end of the same specimen. Natural size. Machiakou limestone, W6n-Nan, 

 Mon-Yin-Hsien, Shantung. (Cotype, V. K. Ting coll., G. S. Ch. Cat. No. 112). 



Fig. 10. Stere<>plasmoceras actinocerifornie Grabau p. G9 



lOa. Longitudinal section of a specimen showing hollow uummuli of siphuncle below 

 and filling with matrix in upper part. Also irregular pseudosepta and filling of 

 stereoplasm. Natural size. 



1 Ob. Cross-section of the same. Natural size. Machiakou limestone, Kushan, Chihli. 

 (Cotype, V. K. Ting coll. G. S. Ch. Cat. No. 60) . 



Fig. 11. Stereoplasmoccras pseudoseptatum Grabau p. 66 



Longitudinal section of an early portion of a conch, showing character of septa, 

 pnmene and siphuncle. Natural size. Machiakou limestone, South of "\V6n-Nan, 

 Mon-Yin-Hsien, Shantung. V. K. Ting coll. (Cotype. G. S. Ch. Cat. No. 112). 



127 



