78 PROt'EEDim}^ OF THE NATIONAL MUSEUM. vol. xxix. 



PTYCHOPARIA DRYOPE, new species. 



The head ropnvsciitiiiu- thiw species is of the same t^'pe as tliat of 

 PhjchojHLrla titlana^ from the base of the C-haiig' Hsia formation. It 

 differs from it in havinu- a more elongate glabella, which is more traris- 

 verse in front. It is also not probable that species of this character 

 would range through 2,500 feet of limestone. It is often the case that 

 heads that appear to have the general features of Ptychoparia are 

 found to belong to other genera when the thorax and pygidium are 

 known. This species is associated with Ptychaspis ceto., Illxniirus 

 dictys, Menocephalus depressus^ and Cyrtoceras camhria. 



FormMion and locality. — Upper Cambrian, upper portion of Chao 

 Mi Tien formation; Pagoda Hill, 1 mile west-southwest of Tai An Fu, 

 Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



PTYCHOPARIA GRANULOSA, new species. 



The gently convex central portions of the head, exclusive of the 

 free cheeks, are all that is known of this species. These indicate a 

 rather broad, semicircular head, with small free cheeks; wide fixed 

 cheeks; narrow, short, convex glabella and narrow, flattened frontal 

 rim; glabella marked b}^ three pairs of faintly impressed but cleai' 

 glabellar furrows; frontal space between the glabella and rim broader 

 than the frontal rim and slightly convex; ocular ridge narrow, clearl}^ 

 defined, and merging into a rather small eye lobe. 



Surface flnel}^ granulose. 



Fornuitlon and locality. — Lower Cambrian, Man To formation; 

 Chang Hsia, Shangtung, China, 



Collected by Eliot BlackAvelder, of the Carnegie Institution of 

 Washington P^xpedition to China. 



PTYCHOPARIA IMPAR, new species. 



This species is represented by many flne specimens of the rather 

 convex central portions of the head. The form of the parts preserved 

 is not unlike that of Ptychoparia aclls. They differ in being more 

 convex and stronger and in the absence of an occipital spine and the 

 presence of rather faint glabellar furrows. Ocular ridge rounded 

 and rather strong. Surface finely punctate. 



Formation and locality. — Lower Cambrian. Man To formation. 

 Chang Hsia, Shangtung, China. 



Collected ])y Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



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