Plate 12 



Page 



Figures 1, 2. Hormotoma pagodai, new species 57 



Two somewhat broken casts of the interior. 

 Middle Ordivieian, Ssuyen formation : 1.5 miles nortli of 

 Pen-hsi-hu, Liao-tung, Manchuria. 



3-8. Maclurites Mgshyi (Hall) 60 



3-5, Top, umbilical, and side views of a specimen. 

 Middle Ordovician, Ssuyen formation : Near Pen-hsi-hu, 

 Liao-tung, Manchuria. 



6, A natural section of the shell. 



Middle Ordovician, Ssuyen formation : Near Tao-yuan- 

 kou, Liao-tung, Manchuria. 



7, 8, Top and side views of a cast. 



Middle Ordovician, Ssuyen formation : Near Niu-hsin-tai, 

 Liao-tung, Manchuria. 



9. Maclurites nitida (Ulrich and Scofield)? 61 



Side view of a cast. 



Locality same as Figures 7 and 8. 



119 



