DESCRIPTION OF GENERA AND SPECIES. 2OI 



The pygidium has a narrow, planulate margin and a rather narrow, convex axis, 

 marked by four or five transverse furrows, which divide it into four or five rings, and 

 a small terminal portion ; the furrows extend across the pleural lobes and faintly on 

 the margin. 



Surface minutely punctate under a strong lens. 



The largest specimen of the cephalon has a length of 12 mm. 



This species is well represented by fragments in limestone and by entire speci- 

 mens flattened in argillaceous shale, in the collection made by Prof. J. P. Iddings 

 in Manchuria. 



Anomocarc commune Lorenz is illustrated by drawings of the cranidium that 

 are identical with some of the variations of Anomocarella chinensis in which the 

 arching inward of the posterior margin of the frontal border is not definitely shown. 

 [Lorenz, fig. 10.] 



Both A. chinensis Walcott and Anomocare commune Lorenz are associated with 

 Dolichomctopus deois Walcott [ = Baikyuriscus asiaticus Lorenz and Amphototi stein- 

 manni Lorenz]. 



The most nearly related form to Anomocarella clihicusis is A. albion [p. 195]. 

 The latter differs in having a proportionately shorter frontal limb and rim, and in 

 the form of the glabella. 



Formation and Locality. Middle Cambrian : (("2) Lower shale member of the 

 Kiu-lung group [Blackwelder, 190717, pp. 37 and 40 (part of the third list of fossils), 

 and fig. 10 (beds 4 and 5), p. 38], 2 miles (3.2 km.) south of Yen-chuang, Sin-t'ai 

 district, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Also from Locality 057, limestone nodules in the lower shale member of the 

 Kiu-lung group [Blackwelder, 19070, pp. 37 and 40 (first list of fossils)], 3 miles 

 (4.8 km.) south of Kao-kia-p'u, and 4 miles (6.4 km.) north of Sin-t'ai-hien, Sin-t'ai 

 district, and (C62) earthy layer in the middle limestone of the Kiu-lung group, 

 [idem (last list of fossils), and fig. 10 (base of bed 7), p. 38], 2.5 miles (4 km.) south 

 of Yen-chuang, on the north-northeast spur of Hu-lu-shan, Sin-t'ai district, Shan- 

 tung, China. 



Collected by Li San. 



Also from Localities 35 n and 35 r, 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, and (36 g) shale about 130 feet 

 (40 m.) above the white quartzite [see idem, for general section showing stratigraphic 

 relations], collected in drainage cuts a short distance back from the bluff [see 35 n] 

 forming 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 comus (Walcott). 

 Plate 19, Figures 9, ga. 



Ptvchoparia comus WALCOTT, 1906, Proc. U. S. Nat. Mus., vol. xxx, p. 586. (Species described 

 essentially as below.) 



Of this species only the central portions of two small cephala are known. The 

 glabella and fixed cheeks are convex; glabella convex, truncato-conical, and marked 

 by three pairs of faint furrows; occipital furrow rather broad, rounded, and moder- 

 ately deep ; occipital ring narrow at the sides, widening gradually toward the center, 

 where it is a little elevated above the plane of the glabella and not much wider than 



