DESCRIPTION OF PLATE 21. 
Anomocarella tatian (Walcott) (p. 206). 
1. Dorsal and side views of type specimen of cranidium, X 1.5. From Locality C23, Middle Cambrian, 
east-southeast of Ch’ang-hia, Shan-tung. U.S. Nat. Mus., Cat. No. 58198. 
1a. Associated free cheek, X 1.5. (C23.) U.S. Nat. Mus., Cat. No. 58199. 
1b. Associated pygidium X 1.5. (C23.) U.S. Nat. Mus., Cat. No. 58200. 
Anomocarella biston (Walcott) (p. 198). 
2. Type specimen of cranidium of this species, and side outline, X 3. From Locality C2, Middle Cam- 
brian, Kiu-lung group, south of Yen-chuang, Shan-tung. U.S. Nat. Mus., Cat. No. 58201. 
Anomocarella bigsbyi (Walcott) (p. 198). 
3. Cranidium with smooth glabella, X 2.5. U.S. Nat. Mus., Cat. No. 58219. 
3a. Cranidium and side outline, X 1.5. U.S. Nat. Mus., Cat. No. 58220. 
3b. Associated pygidium referred to this species, X 2. U.S. Nat. Mus., Cat. No. 58221. 
The three specimens illustrated are from Locality C71, Middle Cambrian, Ki-chéu formation, south of 
Tung-yii, Shan-si. 
Anomocarella tenes (Walcott) (p. 207). 
4. Cranidium and side outline view of type specimen, * 4. From Locality C28, Middle Cambrian, 
Ch’ang-hia limestone, east-southeast of Ch’ang-hia, Shan-tung. U.S. Nat. Mus., Cat. No. 
58222. 
Anomocarella undata (Walcott) (p. 210). 
5. Cranidium and side outline of type specimen, X 4. From Locality C71, Middle Cambrian, Ki-chéu 
formation, southwest of Tung-yii, Shan-si. U.S. Nat. Mus., Cat. No. 58202. 
Coosia superba Walcott (p. 213). 
6. A nearly entire dorsal shield, with exception of free cheeks of cephalon. Natural size. From 
Locality 91, Middle Cambrian, Conasauga formation, Coosa River at Cedar Bluff, Alabama. 
U.S. Nat. Mus., Cat. No. 57589. 
6a. Side view of specimen represented by fig. 6. U.S. Nat. Mus., Cat. No. 57589. 
Coosia carme (Walcott) (p. 211). 
7. Dorsal view and side outline of type specimen of cranidium, X 1.5. From Locality C38, Upper 
Cambrian, Ch’au-mi-tién limestone at Ch’au-mi-tién, Shan-tung. U.S. Nat. Mus., Cat. No. 
58226. 
Coosia decelus (Walcott) (p. 212). 
8. Dorsal view and side outline of type specimen, showing cranidium. Natural size. From Locality 
C9, Middle Cambrian, Kiu-lung group, southwest of Yen-chuang, Shan-tung. U. S. Nat. 
Mus., Cat. No. 58227. 
Coosia robusta Walcott (p. 213). 
g. Dorsal and side views of type specimen of cranidium. Natural size. From Locality 107, Middle 
Cambrian, Rome formation limestone at Bull Run, Copper Ridge, northwest of Knoxville, 
Tennessee. U.S. Nat. Mus., Cat. No. 57590. 
ga. Associated pygidia, X 2. U.S. Nat. Mus., Cat. No. 57591. 
Coosia ? bianos (Walcott) (p. 210). 
10. Dorsal view and side outline of type specimenof cranidium. Natural size. From Locality C64, 
Upper Cambrian, Kiu-lung group, southwest of Yen-chuang, Shan-tung. U.S. Nat. Mus., 
Cat. No. 58228. 
1oa. Associated pygidium with broad border broken away. U.S. Nat. Mus., Cat. No. 58229. 
Coosia ? daunus (Walcott) (p. 211). 
11. Fragment of a cranidium, showing glabella and a portion of frontal limb. Natural size. U. S. 
Nat. Mus., Cat. No. 58230. 
11a. Fragment of a free cheek associated with specimen represented by fig. 11. Natural size. U.S 
Nat. Mus., Cat. No. 58231. 
11). Pygidium associated with specimens represented by figs. 11 and 11a. Natural size. U.S. Nat. 
Mus., Cat. No. 58232. 
11¢c. Enlargement to show the peculiar, punctate outer surface. 
All of the specimens illustrated are from Locality C2, Middle Cambrian, Kiu-lung group, south of Yen- 
chuang, Shan-tung. 
Coosia (?) limbata (Angelin) (p. 214). 
12. Cranidium somewhat flattened in limestone matrix. Natural size. From Locality 8w, Middle 
Cambrian, Andrarum limestone, Andrarum, Sweden. U.S. Nat. Mus., Cat. No. 58233. 
12a. Associated pygidium. U.S. Nat. Mus., Cat. No. 58234. 
Dolichometopus deois Walcott [see plate 22] (p. 216). 
13. Cranidium curled down and flattened in shale, X 2. U.S. Nat. Mus., Cat. No. 58235. 
13a. Matrix of a cranidium flattened in shale, X 2. U.S. Nat. Mus., Cat. No. 58236. 
13b. Free cheek associated with figs. 13 and 13a, X 2. U.S. Nat. Mus., Cat. No. 58237. 
13c. Matrix of a pygidium associated with fig. 13a, X 2. U.S. Nat. Mus., Cat. No. 58238. 
13d. Pygidium with test removed, X 2. U.S. Nat. Mus., Cat. No. 58239. 
All of the specimens represented by figs. 13, 13a-d are in argillaceous shale from Locality 350, Middle 
Cambrian, Fu-chéu series, Liau-tung, Manchuria. 
Ptychaspis ? spp. undt. Walcott [see plate 17, figs. 1, 6-8] (p. 186). 
14. A large free cheek. Natural size. From Locality C64, Upper Cambrian, upper limestone of Kiu- 
lung group, southwest of Yen-chuang, Shan-tung, China. U.S. Nat. Mus., Cat. No. 58127. 
15. Portion of a large glabella. Natural size. From Locality C54, Upper Cambrian, Ch’au-mi-tién 
limestone, west of Tsi-nan, Shan-tung, China. U.S. Nat. Mus., Cat. No. 58128. 
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