210 RESEARCH IN CHINA. 



Anomocarella undata (Walcott:). 



Plate 21, Figure 5. 

 J'lyiiin/'ririn itnJalu WALCOTT, 1906, Proc. U.S.Nat. Mus., vol. XXX, p. 589. (Described as a new species.) 



This species is represented by four specimens of the central portions of the 

 cephalon, exclusive of the free cheeks. These show that the cephalon was semi- 

 circular in outline and rather strongly convex. Glabella convex, irregularly sub- 

 quadrangular in outline; it narrows slightly from the base toward the front; the 

 postero-lateral angles are rounded, and the anterior angles more broadly rounded 

 into the slightly curved front ; three pairs of glabellar furrows are indicated by slight 

 depressions that extend in from the margin about one-half the distance to the median 

 line; the posterior pair extends obliquely backward so as to indicate oval postero- 

 lateral lobes; occipital ring rounded and strongly denned, narrow at the sides, 

 gradually widening toward the center, which is slightly above the plane of the 

 surface of the glabella; occipital furrow narrow, rounded, distinct, and curving 

 slightly forward toward the center; dorsal furrow rather sharply defined at the sides 

 and shallow in front of the glabella. 



Fixed cheeks narrow and elevated into a ridge opposite the palpebral lobe, 

 which is separated by a narrow, curved furrow; palpebral ridge low, narrow, and 

 passing obliquely from the anterior end of the palpebral lobe to the antero-lateral 

 angle of the glabella ; postero-lateral limb narrow, about as long as the width of the 

 front of the glabella, and marked by a rather strong furrow within an elevated, 

 narrow posterior rim, frontal limb narrow, merging in front into the narrow, slight 

 furrow produced by the union of the frontal limb and frontal rim; frontal rim of 

 medium width, moderately convex, and rounding down to meet the frontal limb. 



Surface appears to be minutely and irregularly punctate under a lens of moderate 

 power. Under a strong lens it is shown to be formed by a network of irregularly 

 inosculating, raised lines, so interrupted in places as to give a granular appearance 

 to the surface. The largest cephalon in the collection has a length of 5 mm. 



This species is most nearly related to Anomocarella comus [plate 19, fig. 9]; it 

 differs in having a proportionately shorter glabella, and a more convex, thickened 

 frontal rim. It differs from A. thraso [plate 19, fig. 14] in its shorter frontal limb 

 and proportionately longer glabella. 



This species is associated with Anomocarella comus [p. 201] and Solenopleura 

 pauperata [p. 169]. 



Formation and Locality. Middle Cambrian: ((.'71) 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 Tung-yu, 

 Shan-si, China. 



Collected by Bailey Willis and Eliot Blackwelder. 



Genus COOSIA Walcott. 



Coosia WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, p. 94. (Described and discussed as a 

 new genus essentially as below.) 



The description of the genotype Coosia superba and the observations accom- 

 panying it may be taken as the description and discussion of the genus. 



Genotype. Coosia superba Walcott [1911, pp. 94-97, plate 16, figs, i, ia]. 



Coosia ? bianos (Walcott). 



Plate 21, Figures 10, ioa. 



AnomocarebianosWAi.con. 1905, Proc. U.S. Nat. Mus., vol.xxix, p. 48. (Species described as below ) 



This species is represented by a portion of the glabella and the frontal limb. 



The glabella appears to have been quadrilateral in outline, broadly rounded in front 



