198 RESEARCH IN CHINA. 



Anomocarella bigsbyi (Walcott). 



Plate 21, Figures 3, $a-b. 



Anomocare bigsbyi WALCOTT, 1906, Proc. U. S. Nat. Mus., vol. xxx, p. 581. (Described and discussed 

 as a new species essentially as below.) 



Of this species only the central portions of the cephalon, exclusive of the free 

 cheeks, are known. Glabella moderately convex ; a glabella 9 mm. in length has a 

 width of 9 mm. at the base and 6 mm. in front; front rounded from the anterior side 

 of the palpebral ridges; surface marked by a pair of faintly impressed posterior 

 furrows that extend obliquely backward from the dorsal furrow toward the center ; 

 a second pair of furrows is indicated by a smooth place on the surface; occipital 

 furrow very shallow at the center, broader and slightly deeper toward the sides, with 

 a shallow pit near the dorsal furrow ; occipital ring of medium width, very slightly 

 convex; dorsal furrow shallow, but clearly indicated at the sides and front of the 

 glabella. 



Fixed cheeks narrow, flat opposite the palpebral lobes ; they curve gently down 

 toward the posterior furrow and more abruptly in front ; palpebral lobes small, less 

 than one-fifth the length of the cephalon ; the marginal rim is prominent, and passes 

 obliquely into the low, broad palpebral ridge which crosses the cheek obliquely to 

 the antero-lateral angle of the glabella; frontal limb slightly concave, passing with 

 very slight interruption into the flattened rim, the line of demarcation between the 

 limb and rim being little more than the angle formed by the union of the sloping 

 limb with the more nearly horizontal rim. 



Surface minutely granular, the granules being irregularly distributed, and rising 

 abruptly from the general surface. A cephalon of 15 mm. in length has the same 

 width at the palpebral lobes. 



This species may be compared with Anomocarella iemcnns [plate 20, fig. 7], 

 from which it differs in its broader glabella and less distinctly marked line between 

 the frontal limb and rim. The small palpebral lobe is like that of Anomocarella 

 bergioni [plate 19, fig. 13). 



Formation and Locality. Middle Cambrian: (C71) Massive cliff-making lime- 

 stone in the central portion of the Ki-chou formation [Willis and Blackwelder, 1907, 

 pp. 139 and 145 ("second list of fossils)], 4 miles (6.4 km.) southwest of Tting-yii, 

 Shan-si, China. 



Collected by Bailey Willis and Eliot Blackwelder. 



Anomocarella biston ( Walcott i. 

 Plate 21, Figure 2. 



Anomocare biston WAI.COTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 49. (Described as a new species 

 essentially as below.) 



This species is represented by some fragments of the central portion of the 

 cephalon. Glabella moderately convex, subquadrilateral in outline, narrowing 

 slightly toward the broadly rounded, almost transverse front; surface marked by 

 three pairs of slightly impressed, short furrows; occipital furrow rounded, distinctly 

 marked, transverse ; occipital ring narrow at the sides, broadening toward the center 

 to form the base of a moderately strong spine; dorsal furrow narrow, rounded, and 

 distinct. 



Fixed cheeks narrow, scarcely more than a ridge between the dorsal furrow 

 and the palpebral lobe; palpebral lobe about one-third the length of the cephalon, 

 separated from the fixed cheek by a narrow, deep groove; palpebral ridge short, 

 distinct, and merging into the rim of the palpebral lobe; postero-lateral limb about 



