DESCRIPTION OF GENERA AND SPECIES. 203 



Fixed cheeks narrow, almost lost in the palpebral lobes; in front of the latter 

 they extend forward and downward, as narrow, convex ridges, merging into the 

 frontal limb; palpebral lobes strong, about one-third the length of the cephalon; 

 palpebral ridge merged into the fixed cheek on the back side and defined by a short, 

 steep slope on the front side; frontal limb of medium width, sloping with very little 

 convexity to the narrow furrow separating the frontal limb from the relatively broad, 

 flattened frontal rim ; the length of the latter in front of the glabella is a little more 

 than that of the frontal limb. 



vSurface slightly roughened by elevated, irregular, more or less inosculating 

 lines upon which numerous, minute nodes occur. The result is that on some por- 

 tions the surface appears to be finely granulose, and on others finely punctate, the 

 interspaces between the inosculating lines giving the punctate appearance and the 

 nodes on the lines the granulose appearance. A cephalon 4.5 mm. in length has the 

 same width at the palpebral lobes, exclusive of the free cheeks. 



The nearest related species is Lisania bura [plate 15, fig. 15]. It differs from the 

 latter in having a short frontal limb between the glabella and frontal rim, relatively 

 larger palpebral lobes, and a stronger dorsal furrow about the glabella. 



Formation and Locality. Middle Cambrian: (077) Limestone interbedded in 

 green shales not more than 300 feet (90 m.) above the Man-t'o shales [Willis and 

 Blackwelder, 1907, p. 144 (first list of fossils)], 4 miles (6.4 km.) southeast of Yau-t'o, 

 near Wu-t'ai-hien, Shan-si, China. 



Collected by Eliot Blackwelder. 



Anomocarella macar V/alcott. 

 Plate 20, Figures 6, 6a-d. 



Anomocarella macar WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, p. 92, plate 15, figs, n, 

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



Of the Chinese species of Anomocarella, the cranidium of this species may be 

 compared with that of A. tatian [plate 21, fig. i] in that the frontal limb curves 

 more abruptly down toward the frontal margin than in most species of the genus, 

 and the frontal margin also bends downward to a greater degree. The outline of 

 the glabella and fixed cheeks is almost similar in the two species. The associated 

 pygidia are more elongate than those referred to A. tatian and have a greater num- 

 ber of segments in the axial and pleural lobes. 



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 showing 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 J. P. Iddings and Li San. 



Anomocarella smith! Walcott. 

 Plate 19, Figures 16, i6o-&. 



Annmocardlu smitlii WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, pp. 92-94, plate 17, 

 figs. 3 and 30. (Described and discussed as a new species essentially as below.) 



Dorsal shield of medium size, elongate-elliptical in outline, convex, with the 

 axial lobe strongly defined and convex. Cephalon semicircular in outline with the 

 genal angles extended into short, sharp spines; a narrow, flattened border extends 

 across the front of the cranidium and continues along the free cheeks until it passes 

 into the genal spines; the posterior margin is narrow and distinctly defined by a 



