Plate 39 



Page 



Figure 1. Buthyurus{'i) species undetermined 110 



A cephalon (X 2). 



Ordovician : Near Huans-pa-yi, Sliensi, China. 



2. Cryptolithus nniltiseriatus, new species 110 



An incomplete cephalon (X 2). 



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



3-8. Cryptolithus ivelleri, new species 111 



3-7, Five cephalia (X 2), some showing very fine punctation. 

 Upper Ordovician : Near Cliao-Iuia, Szechwan, China. 

 8, A cephalon ( X 2 ) . 

 Upper Ordovician : Near Chien-lio-hsien, Szechwan, China. 



9. Calynicncil) species undetennined 114 



A cephalon. 



Ordovician : Near Chao-hua, Szechwan, China. 



10. Nileus vmlcotti, new species 113 



Portion of a dorsal shield. 



Ordovician : Near Ning-kiang, Shensi, China. 



11-17. Asaphus asiaticus, new species 112 



11-13, Three cephalia. 

 14-17, Four pygidia. 

 Locality same as Figure 1. 



18-20. Megalaspis insculpta, new species 111 



18, 19, Two pygidia, showing the peculiar striation on the 



surface. 

 20. A cast of a complete pygidium. 

 Locality same as Figure 9. 

 146 



