NO. 1416. CA MBRIA N FA UNAS OF CHINA— WA L CO TT. 6 1 



Formation and locality. — Upper Cambrian, upper portion of Chang 

 Hsia formation, in granular gray limestone; Chao Mi Tien, Shang- 

 tung, China. 



Collected b>' Eliot Blaokwelder of the Carnegie Inscitution of 

 Washington Expedition to China. 



MENOCEPHALUS ADMETA, new species. 



Glabella strongly convex, with sub-parallel sides and rounded front; 

 occipital furrow narrow and deep; occipital ring narrow at sides, 

 increasing in width toward the center, slightly convex, rising with a 

 backward slope from the bottom of the occipital groove; dorsal fur- 

 row narrow and strongly defined. 



Fixed cheeks about two-thirds of the width of the glabella, slightly 

 convex opposite the palpebral lobe, and sloping downward to a strong- 

 furrow within the rounded rim of the short postero-lateral limb; 

 frontal rim narrow and slightly rounded. 



Surface apparentl}^ minutely punctate under a strong lens. The 

 only head of this species in the collection has a length of less than 

 2 mm. 



This species is distinguished from M. acla by the form of the con- 

 vex glabella, flattened instead of wire-like frontal rim, and punctate 

 surface. It does not appear to be closely related to any other species. 



Fortnatlon a)id locality. — Upper portion of Chang Hsia formation, 

 in dense mottled and crystalline limestone. Chang Hsia, Shangtung, 

 China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



MENOCEPHALUS ADRASTIA, new species. 



This is a minute head, having a strongly convex, almost globular 

 glabella that rises abruptly from the deep dorsal furrow. A shallow 

 furrow outlines small postero-lateral lobes at the base of the glabella; 

 occipital furrow narrow and distinct; occipital ring slightly convex 

 back of the occipital furrow, narrow at the sides and widening gradu- 

 ally toward the center. 



Fixed cheeks about one-half the width of the glabella, strongly con- 

 vex; frontal limb obsolete; frontal rim about half as wide as the 

 fixed cheeks, slightly convex, and separated from the fixed cheeks by 

 a transverse, narrow, shallow groove. 



The above is all that is known of this form. Its globose glabella, 

 convex fixed cheeks, and occipital ring distinguish it from other 

 species. The length of the glabella and frontal rim is 2.5 mm. in one 

 specimen, with an occipital ring about 1 mm. long. 



