DESCRIPTION OF PLATE 17—Continued. 
Solenopleura pauperata Walcott (p. 169). 
18. Type specimen showing portions of central parts of cephalon; and side outline of same, X 5. From 
Locality C71, Middle Cambrian, Ki-chéu formation, southwest of Tung-yii, Shan-si. U. S. 
Nat. Mus., Cat. No. 58074. 
Solenopleura sp. undt. Walcott (p. 170). 
19. Pygidium doubtfully referred to this genus, X 4. From Locality C21, Middle Cambrian, Ch’ang- 
hia formation at Ch’ang-hia, Shan-tung. U.S. Nat. Mus., Cat. No. 58075. 
Chuangia batia (Walcott) (p. 170). 
20. Central parts of cephalon of a specimen from which the test has been exfoliated, from Locality 
C64, Upper Cambrian, Ch’au-mi-tién limestone, Kiu-lung group, southwest of Yen-chuang, 
Shan-tung. Natural size. U.S. Nat. Mus., Cat. No. 58062. 
20a. Top view and side outline of a fragment of the central parts of a cephalon from Locality C44, 
Upper Cambrian, Ch’au-mi-tién limestone, at Ch’au-mi-tién, Shan-tung. Natural size. 
U.S. Nat. Mus., Cat. No. 57606. 
20b. Top view and side outline of a fragment of the central parts of a cephalon from Locality C 33a, 
Upper Cambrian, Ch’au-mi-tién limestone, 9 miles (14.4km.) north of Sin-t’ai-hién, Shan-tung. 
Natural size. U.S. Nat. Mus., Cat. No. 58063. 
20c. Pygidium from Locality C11, Upper Cambrian, Ch’au-mi-tién limestone, 2.1 miles (3.4 km.) south- 
west of Yen-chuang, Shan-tung. Natural size. U.S. Nat. Mus., Cat. No. 58064. 
2od. Cast of interior of a pygidium, associated with cephalon represented by fig. 20a. Natural size. 
From Locality C44, the same as 20a, Upper Cambrian, Ch’au-mi-tién limestone, at Ch’au-mi- 
tién, Shan-tung. U.S. Nat. Mus., Cat. No. 57576. 
Chuangia nitida Walcott (p. 172). 
21. Top view and side outline of a fragmentary specimen of central parts of a cephalon from the Ch’au- 
mi-tién limestone near Yen-chuang, X 3. From Locality C11, Upper Cambrian, southwest 
of Yen-chuang, Shan-tung. U.S. Nat. Mus., Cat. No. 57609. 
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