80 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



Forriiathm <irid locdTifij. — Lower Cambrian. Man To formation. 

 At Chang- H.sia and 1 mile south, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



PTYCHOPARIA TELLUS, new species. 



All that is known of this species is the central part of the head, 

 exclusive of the free cheeks. The specimens occur on the surface of 

 shal}^ limestone, and are probably somewhat compressed; their con- 

 vexity is relatively slight. Glabella large, convex, and nearly as 

 wide in front as at the base; three pairs of glabellar furrows are 

 indicated on the somewhat eroded outer surface of two specimens; 

 occipital furrow shallow, narrow, and rounded, but quite distinct; 

 occipital ring narrow at the sides, increasing in width and inclining 

 backward toward the middle, where it rises to the base of a strong 

 spine, which is directed upward and backward; the spine is nearl}^ 

 straight, and about as long as the length of the head; dorsal furrow 

 clearl}' delined on the sides and in front of the glabella. 



Fixed cheeks slightly convex and less than half the width of the 

 glabella; palpebral lobes rather large; ocular ridges clearh^ defined 

 and merging into the palpebral lobe; frontal limb short, slightly con- 

 vex, and merging into the flattened frontal rim, the line of demar- 

 cation between the two being very slight; posterior lateral limbs 

 small and short. 



Surface unknown. 



The largest head in the collection has a length of 10 mm. with a 

 width of 11 nnn. at the outer edges of the palpel)ral lobes. 



This species is most nearly related to LonehocepJuihis Jiamulus. It 

 difl'ers in having wider fixed cheeks and in the proportion of length of 

 the frontal limb and rim as compared with the glabella. 



Foriivition and 'locality. — Middle Cambrian. Lower portion of 

 Chang Hsia formation. Two miles south of Yen Chuang, Hsin Tai, 

 Shangtung, China. 



Collected by Elliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



PTYCHOPARIA TENES, new species. 



Of this species only the moderateh' convex central portions of the 

 head are known. Glabella prominent, moderately convex, narrow- 

 ing ver}^ gradually toward the broadl}' rounded front; furrows only 

 faintly indicated; occipital ring strong and bearing a broad base of a 

 spine that extends obliquely upward and backward; occipital furrow 

 shallow on the sides and scarcely perceptible at the center; dorsal fur- 

 row rounded and clearly defined. Fixed cheeks slightl}^ convex and 

 about one-third the width of the glabella; the length of the palpebral 



