NO. 1415. CAMBRIAN FAUNAS OF CHINA— WALCOTT. 73 



.strongh" pustnloso surface instead of irregular, more or less concen- 

 tric rido-es and furrows. The largest specimen of the head in the 

 collection has a length of 17 mm. 



Formation and locallfy. — Upper Cambrian, Chao Mi Tien forma- 

 tion, about the middle of the formation; 7.5 miles east of Chao Mi 

 Tien, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



PTYCHASPIS CAMPE, new species. 



This species is represented by a fragment of a small head that is so 

 distinct in its surface granidation, large eye lobe, and frontal portion 

 of the head that it can not be readily confused with any other species. 

 The glal)ella is diyided by two narrow, transverse, slightly backward- 

 curving furrows into two narrow lobes and a large anterior lobe that 

 is marked by two pairs of short, very narrow furrows on the lateral 

 slopes: the anterior lolje is about as long as wide, slightly convex 

 behind and strongly convex in front, but not at all globose or tumid; 

 it is broadly rounded, almost transverse in front, and has parallel sides; 

 frontal limb very narrow in front of the gla))ella, widening at the 

 sides: it is separated from a downward-sloping frontal rim \)\ a very 

 narrow^ transverse furrow; the frontal rim is very slightly convex, 

 and from two to three times as wide as the frontal lind) in front of 

 the glabella; dorsal furrow narrow and deep on the sides, and little 

 more than a line in front of the glabella. 



Fixed cheeks very narrow at the front and back and merging into a 

 large palpebral lot)e at the center; they rise rapidly from the dorsal 

 furrow^ and arch over into the furrow within the narrow palpebral 

 lobe; palpel)ral lol)e extends from opposite the anterior pair of 

 furrows on the frontal lol)e of the glal)ella back to the posterior 

 transverse furrow. 



Surface marked by large, low, closely arranged granulations or 

 pustules. This is a small species, the type specimen of the glabella 

 having a length of 4 nnn. with a width of 2 nmi. 



Formatlou and locality. — Upper Cambrian, Chao Mi Tien forma- 

 tion, about the middle of the formation: 7.5 miles east of Chao Mi 

 Tien, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



PTYCHASPIS CETO, new species. 



Head, exclusive of the free cheeks, sub-rhoml)oidal in outline, 

 strongly convex. Glabella large, strong, with very convex frontal 

 lobe, sides sub-parallel, front broadly rounded; two strong glabellar 

 furrows cross transversely from side to side, dividing the glabella into 

 two rather narrow posterior lobes and an anterior, globose lobe that 



