NO. 1415. CAMBRIAN FAUNAS OF CHINA— WALCOTT. 63 



Fixed cheeks about one-half the width of the glabella, convex, arch- 

 ing with about the same slope to the palpebral lobe from the front and 

 back; palpebral lobe small, situated about midwaj'^ of the cheek; no 

 evidence of the presence of an ocular ridge; postero-lateral limb short, 

 marked by a distinct gi'oove parallel to the narrow, elevated posterior 

 margin; frontal rim narrow, convex, and separated from the glabelhi 

 and fixed cheeks by a distinct narrow groove. 



Surface with numerous low, medium-.sized, scattered pustules. The 

 tj^pe and only specimen of the head in the collection has a length of 

 4.5 mm. 



This species is doubtfulh' referred to the genus Menocephalus. It 

 is most nearly related to 3L ocis, but differs in having a less convex 

 glabella and narrower fixed cheeks. 



Formation and locality i — Upper Cambrian, lower portion of Chao 

 Mi Tien formation, in a fossiliferous gray limestone, where it is asso- 

 ciated with Solenoplura helus; Pagoda Hill, a mile west-southwest of 

 Tai An Fu, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



MENOCEPHALUS, species undetermined. 



This form is represented by the anterior half of the glabella and 

 fixed cheeks. These parts indicate that the glabella was strongly con- 

 vex, rounded in front, and marked by two pairs of very slight, short 

 furrows. The fixed cheeks are about two-thirds the width of the 

 glabella and moderatel}" convex; palpebral lobes small and placed 

 about their own length from the frontal rim; frontal rim apparently 

 very narrow, and separated from the glabella and fixed cheeks by a 

 narrow distinct groove. Surface finely pustulose under a strong 

 lens. 



Formation and locality. — Middle Cambrian, near upper portion of 

 Chang Hsia formation, in a compact, hard, gray limestone, about 3 

 miles southwest of Yen Chuang, Hsin Tai, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



Genus PAGODIA, new genus. 



This genus is proposed to include a few species from the Upper 

 Cambrian zone which do not appear to be closely related to any 

 described genus. Only the central portions of the head are avaihible 

 for description. 



Diagnosis. — Glabella oblong, with obscure traces of furrows at the 

 sides. Eyes small, central, and without trace of ocular ridge. Facial 

 sutures cut the front margin opposite the eye lobe, and the posterior 

 margin within the postero-lateral angles. 



