DESCRIPTION OF PLATE 15 Continued. 



Lisania cf. bura (Walcott) (p. 166). 



14. Dorsal view and side oulline of central parts of cephalon, X 4. From Locality C 77, Middle Cam- 

 brian, Ki-chou formation, southeast of Yau-t'o near Wu-t'ai-hien, Shan-si. U. S. Nat. Mus., 

 Cat. No. 58046. 



Lisania bura iWalcott) (p. 166). 



1.5. Dorsal view and side outline of type specimen, showing central parts of cephalon, X 5. From 

 Locality C22, Middle Cambrian, Ch'ang-hia limestone, Ch'ang-hia, Shan-tung. U. S. Nat. 

 Mus., Cat. No. 57605. 



Lisania ? belenus iWalcott) (p. 166). 



1 6. Dorsal and side views of type specimen, showing central parts of cephalon, X 4. F'rom Locality 



C 19, Middle Cambrian, Ch'ang-hia limestone, Ch'ang-hia, Shan-tung. U.S. Nat. Mus., 

 Cat. No. 58047. 



Lisania agonius (Walcott) (p. 164). 



17. Dorsal and side views of central parts of cephalon, X 4. From Locality Cl, Middle Cambrian, 



Kiu-lung group, south of Yen-chuang. Shan-tung. U. S. Nat. Mus., Cat. No. 58048. 

 i -ja. Free cheek, X 3. From Locality C 2 (same as C 1 but a little above it in the section). U. S. Nat. 

 Mus., Cat. No. 58049. 



Lisania ajax (Walcott) (p. 165). 



1 8. Dorsal and side views of type specimen, showing central parts of cephalon, X 4. From Locality 



C 12, Middle Cambrian, Kiu-iung group, southwest of Yen-chuang, Shan-tung. U. S. Nat. 

 Mus., Cat. No. 58050. 



iSa. Free cheek, X 4. From Locality C 4(1, about the same horizon and locality (C 12) as above. U.S. 

 Nat. Mus., Cat. No. 58051. 



Lisania alala (Walcott) (p. 165). 



19. Fragment of central parts of cephalon, and side outline, X 4. U. S. Nat. Mus., Cat. No. 58052. (C'-M.i 

 iga. Fragment of central parts of cephalon, differing somewhat from specimen represented by fig. 19, 



X 4. From Locality C 4. Middle Cambrian, Kiu-lung group, southwest of Yen-chuang, Shan- 

 tung. I'. S. Nat. Mus., Cat. No. 58055. 



196. Free cheek referred to this species, X 3. ((.'>!.) U. S. Nat. Mus., Cat. No. 58053. 



igc (X 4, 051) and igd (X 4). Top and side views of pygidia referred to this species. From Locality 

 ('22, Middle Cambrian, Ch'ang-hia limestone, Ch'ang-hia, Shan-tung. U.S.Nat. Mus., Cat. 

 Nos. 58054 and 58056. 



The specimens represented by figs. 19, igb, and lye are from Locality C'31, Middle Cambrian, 

 Ch'ang-hia formation, Ch'au-mi-tien, Shan-tung. 



Lisania sp. undt. (a) Walcott (p. 167). 



20. Dorsal and side views of pygidium from Locality C30, Middle Cambrian, Ch'ang-hia limestone, 



Ch'ang-hia, Shan-tung. U. S. Nat. Mus., Cat. No. 58060. 



Lisania sp. undt. (b) Walcott (p. 1671. 



-M. Dorsal and side views of a pygidium from Locality C41, Middle Cambrian, Ch'au-mi-tien lime- 

 stone, near Ch'au-mi-tien, Shan-tung. U. S. Nat. Mus., Cat. No. 58061. 



258 



