NO. 4 CAMBRIAN FAUNAS OF CHINA 85 



palpebral lobe small ; palpebral ridge narrow, low, and situated so as 

 to cross the fixed cheek obliquely where the downward slope to the 

 front is most marked ; postero-lateral limbs long, with a strong fur- 

 row within the strong rounded rim ; the front of the glabella passes 

 into the broad groove that merges into the upward sloping, narrow 

 frontal limb ; frontal rim rounded and marked by rather strong 

 striae parallel to the front border. 



Surface smooth to the unaided eye ; a strong lens shows a slight, 

 irregular pitting where the outer surface is intact. The type speci- 

 men of the cephalon has a length of 20 mm. 



Observations. — This species was at first confused with Chuangia 

 batia. It differs from the latter in the form of the g'labella, and the 

 size of the palpebral lobes and frontal limb. The same features dis- 

 tinguish it from Chuangia nitida and C. fragmcnta. 



Formation and locality.- — -Upper Cambrian: (C64) upper lime- 

 stone member of the Kiu-lung group, 2.7 miles (4.3 km.) southwest of 

 Yen-chuang, Sin-t'ai District, Shan-tung, China. 



Collected by Eliot Blackwelder. 



CHUANGIA NITIDA, new species 



Plate IS, fig. 6 



Only the central portions of the moderately convex cephalon of 

 this species is known. Within the facial sutures the outline is sub- 

 quadrangular, exclusive of the short postero-lateral limbs. Glabella 

 slightly convex, truncato-conical, with a very slight trace of short, 

 slightly oblique posterior glabellar furrows ; the latter are shown 

 more distinctly on the cast of the interior ; occipital furrow shallow 

 and clearly defined ; occipital ring slightly convex and rather broad 

 toward the center ; dorsal furrow shallow at the sides of the glabella. 



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

 vex; palpebral ridges strong, low, and passing obliquely backward 

 to the rim of a rather large palpebral lobe ; the latter is a little longer 

 than one-third the length of the cephalon. The frontal limb is repre- 

 sented by the short concave space in front of the glabella which forms 

 a sharp angle in uniting with the frontal limb. 



Surface, slightly pitted when seen through a strong magnifying 

 glass. Length of cephalon, 7 mm. 



Observations. — This species is much smaller than the type species, 

 Chuangia batia. It differs from the latter in its narrower frontal 



