Plate 35 

 J Page 



Figures 1-6. Ptychoglyptus ulrichi, new species 46 



1-3, Exteriors of three different pedicle valves. 

 4, 5, Exteriors of two bracliial valves. 



6, Enlarged photograpli (X 4) of tlie same specimen as 

 Figure 5, showing the surface marlvings. 



Ordovician : Huang-pa-yi, Sliensi, China. 

 7-12. Clitam'bonites hcmistriatus, new species 47 



7, Exterior of a brachial valve. 



8, A broken pedicle valve, showing surface markings. 



9, 12, Interior of a pedicle valve and an enlargement, 



showing the inner surface markings. 



10, Exterior surface of a broken pedicle valve. 



11, Exterior of a brachial valve. Compare with fig. 12 

 for difference between the exterior and interior sur- 

 face markings (X 4). 



Locality the same as Figures 1-3. 

 142 



