DESCRIPTION OF GENERA AND SPECIES. 159 



posterior margin ; frontal limb and rim in front of the glabella moderately convex ; 

 on each side a broad, shallow furrow indicates that the dividing line between the 

 frontal limb and rim was about half way between the front of the glabella and the 

 frontal margin of the cephalon. 



Surface apparently smooth. The type specimen of the cephalon is 7.5 mm. 

 in length. 



This species indicates a type somewhat similar to Inouyia melie [p. 153]. 

 It differs from the latter in not having a swollen frontal limb, in the absence of 

 palpebral ridges, and in having a smaller, flat occipital ring. From Inouyia dim 

 [p. 152] it differs in the presence of the side furrows delimiting the frontal limb and 

 rim, narrower and more convex fixed cheeks, and less strongly marked occipital ring. 



Formation and Locality. Middle Cambrian: (069) Limestone in shales about 

 65 feet (19.5 m.) above the base of the Ki-chou limestone [Willis and Blackwelder, 

 1907, p. 145 (first list of fossils)], 4 miles (6.4 km.) east of Fang-lan-chon, Shan-si, 

 China. 



Collected by Eliot Blackwelder. 



Agraulos sorge Walcott. 

 Plate 15, Figure 9. 



Agraulos sorge WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, p. 82, plate 15, fig. i. 

 (Described and discussed as a new species essentially as below.) 



This species is represented by a single specimen of the central portions of the 

 cephalon. Among the Chinese species referred to Agraulos it may be compared 

 with A. dryas Walcott [plate 14, fig. 20], from which it is readily distinguished by 

 its broader, less convex glabella and its almost smooth, instead of strongly punctate, 

 surface. 



Agraulos sorge appears to have had a strong occipital spine that projected up- 

 ward and backward from the occipital ring ; only the base of the spine is preserved. 



Surface slightly roughened by a minute, irregular, shallow pitting. 



Formation and Locality. Middle Cambrian: (35 n) Fu-chou series, limestones 

 near the base of the series just above the white quartzite [see Blackwelder, 19076, 

 p. 92, for general section giving stratigraphic relations], collected in a low bluff 

 on the shore of Tschang-hsing-tau Island, east of Niang-niang-kung, Liau-tung, 

 Manchuria, China. 



Collected by Eliot Blackwelder. 



Agraulos uta Walcott. 

 Plate 15, Figure 7. 



Agraulos uta WALCOTT, 1906, Proc. U. S. Nat. Mus., vol. xxx, p. 579. (Discussed as a new species as 

 below.) 



This species is based upon a single cephalon, preserving the glabella and fixed 

 cheeks, and frontal rim. It resembles Inouyia capax [p. 151], but differs in having 

 a narrower fixed cheek, less convex and swollen limb, and flatter frontal rim. The 

 glabella is without traces of furrows, and the occipital ring is separated from it by 

 a very shallow, scarcely noticeable, transverse furrow; the frontal limb is rather 

 broad and slightly swollen in front of the glabella ; the general plane of the frontal 

 limb and fixed cheeks is the same from a line drawn through the posterior end of the 

 palpebral lobes. 



Surface slightly roughened by a fine network of narrow, slightly elevated, inos- 

 culating lines. The type specimen has a length of 5.5 mm. 



