^iv) 40 P<il.eoiit)ih<-/i(i. Sinicn Ser- B- 



Genus PtYCHOPARIA Corda 



Ptychoparia fongi Sun (sp nov.) 



Plate IT, Figs. 10 a, b. 



This species is representefi by several dorsal shields and the cranidia associated 

 with tliem. 



Cranidinm modei-atelj^ convex; length and width are subeqnal. Glabella moder- 

 ately convex, beconiing narrower toward ihe front, the front part regularly rounded; it is 

 nrnrked by three paii's of distinct glabellar furrows; the anterior pnir (first pair) short, 

 broad and transverse, extending a very short distance from the dorso-lateral furrows; 

 the second pair about the sanre length and nearly p'n-allel to the first pair, but compara- 

 tively broad; the third pair (posterior pair) broad and oblique extending l>ackward3 and 

 inwards. 



The occipital furrow very deep and very pronounced, transverse and connecting 

 the postero-lateval fuirows at both sides. 'J'hc occipital ring moderately convex, very 

 broad at the center, liccoming narrower toward both sides. 



Fixed cheek br(~)ad about two-thirds the width of the glabella opposite the palpe- 

 bral lobe; palpebral ridge distinct extending the anterior part of the palpebral lobe nearly 

 to the antero-lateral angle of the glabella; dorso-lateral furrows rounded and distinct. 



Frontal limb flat or slightly convex aud separated from the frontal rim by a 

 shallow transverse furrow; frontal rim elevated and upturned from the marginal furrow 

 to the margin; its frontal edge very slightly round; its width about the same as the 

 fi'ontal limb. 



The facial sutiiic cuts the frontal rim and then turns directly Imckward and slight- 

 ly inward towiird the palpebral lobe, and curves around this lol)e, and finallj^ extends 

 backward and outward to cut the free cheek from the postero-latei'al limb which is dis- 

 tinctly marked by a ](i-onounc('(l postero-lateral groove. 



The thorax of a small associated individual has tliirteen or fourteen segments with a 

 narrow axial lobe and wide pleural lobes. The pleural furrow starts on the inner front 

 side of the pleural lobe of each segment and, widening nearly to the Avidth of the seg- 

 ment, begins to narrow at the point of geniculation and terminates near the posterior 

 margin at the s,'>mewhat abrupt falcate termination of the pleurae. 



Pygidium small with a broad axis and pleural lobes indistinctly segmented. 



The form of the glabella and the character of the glabellar furrows suggest P. 

 granosa Walcott from the Manto shale of Shantung, but the comparatively narrow frontal 

 limb, the more conical glabella, and the character of the surface serve to distinguish it. 



