DESCRIPTION OF PLATE; 21. 



Anomocarella tatian (Walcottl (p. 206). 



i Dorsal and side views of type specimen of cranidium, X 1.5. From Locality ( Ztf, Middle Cambrian, 



east-southeast of Ch'ang-hia, Shan-tung. U. S. Nat. Mus., Cat. No. 58198. 

 i i. Associate 1 free ch -rk, X 1.5. (C23.) U. S. Nat. Mus., Cat. No. 58199. 

 j/'. Associated pygidium X 1.5- (023.) U. S. Nat. Mus., Cat. No. 58200. 

 Anomocarella biston (Walcott) (p. 198). 



j T\ pe specimen of cranidium of this species, and side outline, X 3. From Locality C _. Middle Cam- 

 bri MI, Kiu-lung group, south of Yen-chuang, Shan-tung. U. S. Nat. Mus., Cat. No. 58201. 



Anomocarella bigsbyi (Walcott) (p. 198). 



i. Cranidium with smooth glabella, X 2.5. U. S. Nat. Mus., Cat. No. 58219. 



30. Cranidium and side outline, X 1.5. U. S. Nat. Mus., Cat. No. 58220. 



56. 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-chou formation, south of 



Tung-yu, Shan-si. 

 Anomocarella tenes (Walcott) (p. 207). 



4. Cranidium and side outline view of type specimen, X 4. From Locality C'2H, Middle Cambrian, 



Ch'ang-hia limestone, east-southeast of Ch'ang-hia, Shan-tung. U. S. Nat. Mus., Cat. No. 

 58222. 

 Anomocarella undata (Walcott j (p. ,?io). 



5. Cranidium and side outline of type specimen, X 4. From Locality C71, Middle Cambrian, Ki-chou 



formation, southwest of Tung-yu, Shan-si. U. S. Nat. Mus., Cat. No. 58202. 

 Coosia superba V/alcott (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 C31!, Upper 



Cambrian, Ch'au-mi-tien limestone at Ch'au-mi-tien, Shan-tung. U. S. Nat. Mus., Cat. No. 

 58226. 

 Coosia deceius (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). 



9. Dorsal and side views of type specimen of cranidium. Natural sixe. From Locality 107, Middle 



Cambrian, Rome formation limestone at Bull Run, Copper Ridge, northwest of Knoxvillc, 

 Tennessee. U. S. Nat. Mus., Cat. No. 57590. 

 9<j. Associated pygidia, X 2. U. S. Nat. Mus., Cat. No. 57591. 

 Coosia ? bianos (Walcott) (p. 210). 



10. Dorsal view and side outline of type specimen of cranidium. Natural size. From Locality (.'(>!, 



Upper Cambrian, Kiu-lung group, southwest of Yen-chuang, Shan-tung. U. S. Nat. Mus., 

 Cat. No. 58228. 



ion. Associated pygidium with broad border broken away. U. S. Nat. Mus., Cat. No. 58229. 

 Coosia ? daunus (Walcott) (p. Ji i ). 



11. Fragment of a cranidium, showing glabella and a portion of frontal limb. Natural size. U. S. 



Nat. Mus., Cat. No. 58230. 



i ia. Fragment of a free cheek associated with specimen represented by lig. i i. Natural size. I'. S. 

 Nat. Mus., Cat. No. 58231. 



1 1/). Pygidium associated with specimens represented by figs. 11 and nu. Natural size. U. S. N;it. 

 Mus., Cat. No. 58232. 



i ic. 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 !>\v, Middle 



Cambrian, Andrarum limestone, Andrarum, Sweden. U. S. Nat. Mus., Cat. No. 58233. 

 I2. 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. 

 130. Matrix of a cranidium flattened in shale, X 2. U. S. Nat. Mus., Cat. No. 523(>. 

 i$b. Free cheek associated with figs. 13 and 130, X 2. U. S. Nat. Mus., Cat. No. 58237. 

 I3C. Matrix of a pygidium associated with fig. 130, X 2. U. S. Nat. Mus., Cat. No. 58238. 

 \3<L. Pygidium with test removed, X 2. U. S. Nat. Mus., Cat. No. 58239. 



All of the specimens represented by figs. 13, i^a-d are in argillaceous shale from Locality :>."i<>, Middle 



Cambrian, Fu-chou series, Liau-tung, Manchuria. 

 Ptychaspis ? spp. undt. Walcott [see plate 17, figs, i, 6-8] (p. 1861. 



14. A large free cheek. Natural size. From Locality 064, 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-tien 



limestone, west of Tsi-nan, Shan-tung, China. U. S. Nat. Mus., Cat. No. 58128. 



270 



