Pl^TE 38 



Page 



Figures 1, 2. Orthoceras magniclimense, new species 65 



Lateral view of the holotype and a section across the 

 lower part showing location and size of the siphuncle. 

 Ordovician : Near Han-chung-fu, Shensi, China. 



3. Robergia striata, new species 109 



The cephalon ( X 4 ) showing the characteristic surface 



striation. 

 Ordovician : Near Huang pa-yi, Shensi, China. 



4. Cyclocerasi?) shensiense, new species 71 



Vertical section in a lateral direction, showing the 



structure of the siphuncle. 

 Locality same as Figure 1. 



5. Spyroceras species undetermined 73 



A lateral view, showing the annulations and vertical 



striations. 

 Locality same as Figure 1. 



145 



