(iv) 66 Paldioidologia Sinica Ser. B. 



Craiiidia, free cheeks, hypostoma and pygidia appear granulated under a strong 

 lens. 



This species is characterized by its finely granulated character, rather short 

 second lobe, broad flat frontal border, absence of pustules and the conical axial lobe of 

 the pygidium. 



The form of the glabella and its size suggest P. acamus Walcott, but it differs 

 from the lattei- in the comparatively narrow second lobe, in the absence of a marked 

 pustulose and punctate character and in the broad frontal border. When the entire 

 specimen of P. acamus is found, other differences will be found. 



The largest specimen (c) 17 mm. in width has a length of IG mm. 



Measurements : — ■ 



Cephalon 8 a 



Length of cranidium — 



Width of cranidium of palpebral lobe — 



Length of glabella 5.5 mm. 



Width (jf glabella at palpebral lobe 4.0 mm. 



Width of anterior lobe 4.5 mm. 



Vridth of second lobe 1.0 mm. 



Width of occipital ring 1.1 mm. 



Hypostoma 8 d 



Length 6.5 mm. 



Width 6.0 mm. 



Free cheeks 8 e 



Width of cheek body at palpebral lobe 3.5 mm. 



8 b 

 11.0 mm. 

 11.5 mm. 



7.5 mm. 



5.5 mm. 



6.0 mm. 



1.3 mm. 



2.0 mm. 



Width of border of free cheeka 

 Pygidium 

 Length 

 Width 



Length of axis 

 Anterior width of axial lobe 



2.0 mm. 



8f 

 5.0 mm. 



4.5 mm. 

 2.0 mm. 



Horizon and Locality:— Upper Cambrian: from thin bedded argillaceous 

 limestone of Sha-Kuo-Tun, Chin-Hsi-Hsien (^mU) from which this species is named. 

 Collected by Dr. J. G. Audersson. 



