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

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

 siphuncle. Machiakou limestone, W§n-Nan, Mon-Yin-Hsien, Shantung. V. K. 

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



Fig. 9. Stereoplasmoceras actinoceriforme Grabau p. 69 



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



regular arrangement as in Adinoceras. Natural size. 

 9b. 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. Stereoplasmoceras actinoceriforme Grabau p. 69 



10a. Longitudinal section of a specimen showing hollow nummuli of siphuncle below 



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



stereoplasm. Natural size. 

 10b. Cross-section of the same. Natural size. Machiakou limestone, Kushan, Chihli. 



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



Fig, 1 1 . Stereoplasmoceras pseudoseptatum Grabau p. 66 



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

 camerte and siphuncle. Natural size. Machiakou limestone, South of AV^n-Nan, 

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



— 127 



