I5O RESEARCH IN CHINA. 



Fixed cheeks slightly convex, about half the width of the glabella; between the 

 glabella and palpebral lobes the cheeks are almost flat, posteriorly they slope rapidly 

 downward to the short postero-lateral limbs, in front they also slope rapidly down- 

 ward and merge into the frontal limb ; palpebral lobes small ; palpebral ridges narrow 

 and faintly denned ; frontal limb slightly prominent at the central portions, where it 

 merges into the rounded frontal rim, the line of demarcation between the two being 

 very slightly denned ; at the sides the frontal rim narrows and is elevated about the 

 lateral extension of the frontal limb; dorsal furrow very distinctly denned. 



Surface apparently smooth under a strong lens, with the exception of very indis- 

 tinct, irregular lines that radiate from the front of the glabella outward across the 

 frontal limb. 



The one specimen of the cephalon of this species in the collection has a length of 

 5 mm., exclusive of the occipital spine. The width at the palpebral lobes is 5 mm. 



This species is clearly separated from other forms by its strongly defined gla- 

 bella and prominent limb, which is formed by the union of the true limb and the 

 frontal margin. It will probably be referred to some other genus when entire speci- 

 mens of the dorsal shield are found. 



Formation and Locality. Middle Cambrian: (09 and 07 just above 09, same 

 section) Lower limestone member of the Kiu-lung group [Blackwelder, 19070, pp. 

 37 and 39 (the third and the last list of fossils), and fig. Sa (bed 33), p. 29], 3 miles 

 (4.8 km.) and 2.2 miles (3.5 km.) southwest of Yen-chuang, Sin-t'ai district, Shan- 

 tung, China. 



Collected by Eliot Blackwelder. 



Inouyia ? acalle (Walcott). 



Plate 14, Figure 15. 

 Agraulos acalle WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 43. (Species described as below.) 



Central portions of the cephalon, exclusive of free cheeks, moderately convex. 

 Glabella truncato-conical, convex, short, scarcely more than one-half the length of 

 the cephalon, and without traces of furrows; occipital furrow not much more than 

 a depressed line; occipital ring broad, almost subtriangular in outline, and rising 

 at the center to a small node. 



Fixed cheeks about as wide as the glabella, strongly convex, and merging into 

 a frontal limb of about equal width and convexity; palpebral lobe minute, situated 

 opposite the central portions of the glabella ; postero-lateral limbs short, and marked 

 by a narrow furrow parallel to the margin. 



Surface smooth under a strong lens. 



The cephala vary in length from 3 to 4 mm. A specimen 3 mm. in length has 

 a width of 2.5 mm. at the palpebral lobes. 



Formation and Locality. Middle Cambrian: (C12) Gray limestone near the 

 top of the middle limestone member of the Kiu-lung group [Blackwelder, 1907(2, pp. 

 37 and 41 (part of the first list), and fig. 10 (bed 7), p. 38], 3.25 miles (5.2 km.) south- 

 west of Yen-chuang, Sin-t'ai district, Shan-tung, China. 



Collected by Eliot Blackwelder and Li San. 



Inouyia ? armata (Walcott). 



Plate 14, Figures 17, 172. 

 Agraulos armatus WALCOTT, 1906, Proc. U. S. Nat. Mus., p. 576. (Species described as below.) 



This species is represented by a finely preserved specimen of the central portions 

 of the cephalon, exclusive of the free cheeks. The glabella is strongly convex, with 

 the sides slightly converging toward the rounded front; it is marked by three pairs 



