DESCRIPTION OF PLATE 17 Continued. 



Solenopleura pauperata Walcott (p. 169). 



1 8. Type specimen showing portions of central parts of cephalon; and side outline of same, X 5. From 



Locality C71, Middle Cambrian, Ki-ch6u 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 



CGI. Upper Cambrian, Ch'au-mi-tien limestone, Kiu-lung group, southwest of Yen-chuang, 

 Shan-tung. Natural size. U. S. Nat. Mus., Cat. No. 58062. 



2oa. Top view and side outline of a fragment of the central parts of a cephalon from Locality C'44, 

 Upper Cambrian, Ch'au-mi-tien limestone, at Ch'au-mi-tien, Shan-tung. Natural size. 

 U. S. Nat. Mus., Cat. No. 57606. 



206. Top view and side outline of a fragment of the central parts of a cephalon from Locality C3:5u, 

 Upper Cambrian, Ch'au-mi-tien limestone, 9 miles (14. 4km.) north of Sin-t'ai-hien, Shan-tung. 

 Natural size. U. S. Nat. Mus., Cat. No. 58063. 



2oc. Pygidium from Locality C 11, Upper Cambrian, Ch'au-mi-tien limestone, 2.1 miles (3.4 km.) south- 

 west of Yen-chuang, Shan-tung. Natural size. U. S. Nat. Mus., Cat. No. 58064. 



20</. Cast of interior of a pygidium, associated with cephalon represented by fig. 2oa. Natural size. 

 From Locality C44, the same as 2oa, Upper Cambrian, Ch'au-mi-tien limestone, at Ch'au-mi- 

 tien, 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-tien limestone near Yen-chuang, X 3. From Locality Oil, Upper Cambrian, southwest 

 of Yen-chuang, Shan-tung. U. S. Nat. Mus., Cat. No. 57609. 



262 



