DESCRIPTION OF PLATE 7. 
Agnostus parvifrons latelimbatus Lorenz (p. 102). 
1. Cephalon, X 5. [After Lorenz, 1906, plate v, fig. 10.] 
1a. 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 rv, fig. 9a.] 
2. A cephalon, X 4, that occurs on the slab of limestone illustrated on plate 11. 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 douvilléi Bergeron [see plate 11, figs. 6, 7] (p. 100). 
3 and 3a. 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. 57845a. 
3b. Associated cephalon, X 4. (C6.) U.S. Nat. Mus., Cat. No. 57845). 
8 and 8a. Cephalon and pygidium. [After Monke, 1903, plate 101, figs. 1 and 4.] 
Agnostus chinensis Dames (p. 99). 
4 and 4a. Cephala and pygidia compressed in argillaceous shale, X 4. From Locality 36g, Middle 
Cambrian, Fu-choéu series, Liau-tung, Manchuria. U.S. Nat. Mus., Cat. No. 57822. 
~4b. An associated entire dorsal shield, X 4. U.S. Nat. Mus., Cat. No. 57823. 
5 and 5a. Cephalon and pygidium of a typical form of the species, X 4. U.S. Nat. Mus., Cat. Nos. 
57824 and 57825. 
55. Thoracic segment, X 7. U.S. Nat. Mus., Cat. No. 57826. 
5c. Cephalon differing slightly in detail from that represented by fig.5. U.S. Nat. Mus., Cat. No. 57827. 
The specimens represented by figs. 5, 5a-c are from Locality C 1, Middle Cambrian, Kiu-lung group, 
south of Yen-chuang, Shan-tung. 
6 and 6a. Cephalon and pygidium. [After Dames, 1883, plate m1, figs. 18@ and 19a.] 
Agnostus kushanensis Walcott (p. 101). 
7. Typical form of cephalon, X 4. U.S. Nat. Mus., Cat. No. 57840. 
7a. Segment of thorax, X 4. U.S. Nat. Mus., Cat. No. 57841. 
7b. 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-hién, 
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-tién, 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 C32, 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. 1, 1a] (p. 104). 
11. Central parts of cephalon, exclusive of postero-lateral limbs; and side outline of same. Natural 
size. From Locality C16, Lower Cambrian, Man-t’o shale, south of Ch’ang-hia, Shan-tung. 
U.S. Nat. Mus., Cat. No. 57848. 
11a. Free cheek associated with cephalon represented by fig. 11. Natural size. U.S. Nat. Mus., 
Cat. No. 57849. 
11>. Fragment of a thoracic segment. Natural size. From Locality C27 [same as C16], Lower Cam- 
brian, Man-t’o shale (fig. 11) at Ch’ang-hia, Shan-tung. U.S. Nat. Mus., Cat. No. 57850. 
11c. Weathered specimen showing 7 thoracic segments. Natural size. From Locality C15 [same as 
C27, fig. 116], Lower Cambrian, Man-t’o shale at Ch’ang-hia, Shan-tung. U.S. Nat. Mus., 
Cat. No. 57851. 
11d, Fragment of thoracic segment, with strong median spine. Natural size. From Locality C16 
{same as fig. 11], 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. 
12a. Free cheek associated. U.S. Nat. Mus., Cat. No. 57854. 
12b. A cranidium with frontal border outlined from an associated specimen, * 1.5. U.S. Nat. Mus., 
Cat. No. 57855. 
12c. Associated minute cranidium, X 10, tentatively referred to this species. U.S. Nat. Mus., Cat. 
No. 57856. 
12d. Associated hypostoma, X 3. U.S. Nat. Mus., Cat. No. 57857. 
12e. Associated thoracic segment, X 2. U.S. Nat. Mus., Cat. No. 57858. 
All of the specimens illustrated by figs. 12, 120-e are from Locality C3, Lower Cambrian, Man-t’o shale, 
southwest of Yen-chuang, Shan-tung. 
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