DESCRIPTION OF PLATE 7. 



Agnostus parvifrons latelimbatus Lorenz (p. 102). 



1. Cephalon, X 5. [After Lorenz, 1906, plate v, fig. 10.) 



ic. Pygidium, X 5. Reproduced from a photograph of the specimen illustrated by Lorenz. Now in 

 collection of University Museum at Freiburg, Germany. [ Lorenz, 1906, plate iv, fig. 90.) 



2. A cephalon, X 4, that occurs on the slab of limestone illustrated on plate n. This may possibly 



belong to this species. From Locality C6, Middle Cambrian, Kiu-lung group, southwest of 

 Yen-chuang, Shan-tung. U. S. Nat. Mus., Cat. No. 57847. 



Agnostus douvillei Bergeron [see plate n, figs. 6, 7] (p. 100). 



3 and 30. Pygidia, X 4, as they occur on a slab of limestone. From Locality C6, Middle Cambrian, 



Kiu-lung group, southwest of Yen-chuang, Shan-tung. U. S. Nat. Mus., Cat. No. 578450. 

 36. Associated cephalon, X 4. (C6.) U. S. Nat. Mus., Cat. No. 578456. 

 8 and Sa. Cephalon and pygidium. [After Monke, 1903, plate in, figs, i and 4.] 



Agnostus chinensis Dames (p. 99). 



4 and 40. Cephala and pygidia compressed in argillaceous shale, X 4. From Locality 36 g, Middle 



Cambrian, Fu-chou series, Liau-tung, Manchuria. U. S. Nat. Mus., Cat. No. 57822. 

 46. An associated entire dorsal shield, X 4. U. S. Nat. Mus., Cat. No. 57823. 



5 and 50. Cephalon and pygidium of a typical form of the species, X 4. U. S. Nat. Mus., Cat. Nos. 



57824 and 57825. 



56. Thoracic segment, X 7. U. S. Nat. Mus., Cat. No. 57826. 

 $c. Cephalon differing slightly in detail from that represented by fig. 5. U.S. Nat. Mus., Cat. No. 57827. 



The specimens represented by figs. 5, 5<z-c are from Locality C 1, Middle Cambrian, Kiu-lung group, 

 south of Yen-chuang, Shan-tung. 



6 and 6<z. Cephalon and pygidium. [After Dames, 1883, plate II, figs. i8a and 190.] 



Agnostus kushanensis Walcott (p. 101). 



7. Typical form of cephalon, X 4. U. S. Nat. Mus., Cat. No. 57840. 



70. Segment of thorax, X 4. U. S. Nat. Mus., Cat. No. 57841. 



7&. Typical form of pygidium, X 4. U. S. Nat. Mus., Cat. No. 57842. 



From Locality C57, Middle Cambrian, Kiu-lung group limestone nodules, north of Sin-t'ai-hien, 

 Shan-tung. 



Shumardia sp. undt. Walcott. 



9. A pygidium referred to this genus, X 6. From Locality C51, Middle Cambrian, Ch'ang-hia lime- 



stone at Ch'au-mi-tien, Shan-tung. U. S. Nat. Mus., Cat. No. 57843. 



Microdiscus orientalis Walcott (p. 102). 



10. View of interior of cephalon of type specimen, X 7. From Locality C 32, Middle Cambrian, Ki-sin- 



ling limestone, river drift, Southern Shan-si. U. S. Nat. Mus., Cat. No. 57844. 



Redlichia chinensis Walcott [see plate 24, figs, i, ia] (p. 104). 



11. Central parts of cephalon, exclusive of postero-Iateral limbs; and side outline of same. Natural 



size. From Locality C 16, Lower Cambrian, Man-t'o shale, south of Ch'ang-hia, Shan-tung. 



U. S. Nat. Mus., Cat. No. 57848. 

 lia. Free cheek associated with cephalon represented by fig. n. Natural size. U. S. Nat. Mus., 



Cat. No. 57849. 



1 1 b. Fragment of a thoracic segment. Natural size. From Locality C 27 [same as C 16], Lower Cam- 

 brian, Man-t'o shale (fig. n) at Ch'ang-hia, Shan-tung. U. S. Nat. Mus., Cat. No. 57850. 

 nc. Weathered specimen showing 7 thoracic segments. Natural size. From Locality CIS [same as 



C27, fig. 1 1 6], Lower Cambrian, Man-t'o shale at Ch'ang-hia, Shan-tung. U. S. Nat. Mus., 



Cat. No. 57851. 

 lid. Fragment of thoracic segment, with strong median spine. Natural size. From Locality C16 



[same as fig. n]. Lower Cambrian, Man-t'o shale, south of Ch'ang-hia, Shan-tung. U. S. 



Nat. Mus., Cat. No. 57852. 



Redlichia nobilis Walcott (p. 105). 



12. Broken specimen of cranidium restored in outline from other specimens; and side outline, X 1.5. 



U. S. Nat. Mus., Cat. No. 57853. 



I2a. Free cheek associated. U. S. Nat. Mus., Cat. No. 57854. 

 126. A cranidium with frontal border outlined from an associated specimen, X 1.5. U. S. Nat. Mus., 



Cat. No. 57855- 

 I2C. Associated minute cranidium, X 10, tentatively referred to this species. U. S. Nat. Mus., Cat. 



No. 57856. 



I2d. Associated hypostoma, X 3. U. S. Nat. Mus., Cat. No. 57857. 

 I2e. Associated thoracic segment, X 2. U. S. Nat. Mus., Cat. No. 57858. 



All of the specimens illustrated by figs. 12, 12a-e are from Locality C 3, Lower Cambrian, Man-t'o shale, 

 southwest of Yen-chuang, Shan-tung. 



241 



