DESCRIPTION OF PLATE 9. 



Teinistion lansi Monke (p. in). 



i Cranidium of a typical specimen. [After Monke, 1903, plate rv, fig. 2.] 



1 a. Enlargement of cranidium of a very young individual, showing a slightly arched frontal margin, 



instead of concave margin as in fig. i. [After Monke, 1903, plate IV, fig. 5.] 

 i b. Free cheek. [After Monke, 1903, plate IV, fig. 7-1 



Teinistion typicalis (Walcott) (p. in). 



2 and 20. Parts of cranidium of two specimens showing variations in detail of frontal rim, X 8. U. S. 



Nat. Mus., Cat. Nos. 57892 and 57893- 



26 Associated free cheek, X 6. U. S. Nat. Mus., Cat. No. 57894. 

 ic. Associated pygidium, X 6. U. S. Nat. Mus., Cat. No. 57895- 



The four specimens illustrated are from Locality C 12, Middle Cambrian, Kiu-lung group, southwest of 

 Yen-chuang, Shan-tung. 



Teinistion alcon (Walcott) (p. no). 



3. Type specimen of portion of cranidium, X 2. From Locality 012, Middle Cambrian, Kiu-lung 



group, southwest of Yen-chuang, Shan-tung. U. S. Nat. Mus., Cat. No. 57896. 



Teinistion ? sp. undt. Walcott (p. 222). 



4. Pygidium doubtfully referred to this genus, X 4. From Locality 054, Upper Cambrian, Ch'au-mi- 



tien limestone, west of Tsi-nan, Shan-tung. U. S. Nat. Mus., Cat. No. 57897. 



Blackwelderia sinensis (Bergeron) (p. 121). 



5. 50, and si. Three specimens of cranidium showing variations in frontal margin and glabella. Nat- 



ural size. U. S. Nat. Mus., Cat. Nos. 57898, 57899, 57900, respectively. 

 5C. Associated free cheek. Natural size. U. S. Nat. Mus., Cat. No. 57901. 

 5</. Associated hypostoma, X 2. U. S. Nat. Mus., Cat. No. 57902. 



5?. Associated pygidium referred to this species. Natural size. U. S. Nat. Mus., Cat. No. 57903. 

 5/. Associated thoracic segment, X 1.5. U. S. Nat. Mus., Cat. No. 57904. 

 5g. Small pygidium supposed to belong to this species. U. S. Nat. Mus., Cat. No. 57905. 



All of the specimens illustrated are from Locality C 6, Middle Cambrian, Kiu-lung group, southwest of 

 Yen-chuang, except those represented by figs. 52, 5/, and 5g, from Locality C 55, in isolated hills 

 380 feet (i 14 m.) above the W6n-ho, 12 miles (igkm.), south 80 east of Tsi-nan, Shan-tung. 



Blackwelderia cilix (.Walcott) (p. 119). 



6. Broken cranidium. Natural size. From Locality C73, Middle Cambrian, Ki-chou limestone east 



of Fang-lan-chon, Shan-si. U. S. Nat. Mus., Cat. No. 57907. 

 6a. Associated free cheek. Natural size. U. S. Nat. Mus., Cat. No. 57908. 

 6b. Associated pygidium. Natural size. U. S. Nat. Mus., Cat. No. 57909. 

 6c. Pygidium from Locality 055, Middle Cambrian, Ch'au-mi-tien limestone, south of Tsi-nan, 



Shan-tung. U. S. Nat. Mus., Cat. No. 57910. 



Blackwelderia alastor (Walcott) (p. 117). 



7. Type specimen, showing a fragment of cranidium, X 7. U. S. Nat. Mus., Cat. No. 57911. 



^a. Associated pygidium referred to this species, X 1.5. From Locality C12, Middle Cambrian, Kiu- 

 lung group, southwest of Yen-chuang, Shan-tung. U. S. Nat. Mus., Cat. No. 57912. 



Damesella bellagranulata Walcott (p. 125). 



8. Type specimen of cranidium, X 1.5. From Locality C 13, Middle Cambrian, Kiu-lung group, south- 



west of Yen-chuang, Shan-tung. U. S. Nat. Mus., Cat. No. 57913. 

 8a. Under side of free cheek (X 2) on the same slab of rock as the specimen represented by fig. 8. 



Doubtfully referred to the species. U. S. Nat. Mus., Cat. No. 57914. 

 86. Free cheek associated with and referred to this species, X 1.5. U. S. Nat. Mus., Cat. No. 57915. 



Damesella brevicaudata Walcott (p. 128). 



9. Top and side views of type specimen of pygidium, X 2. From Locality C19, Middle Cambrian, 



Ch'ang-hia limestone at Ch'ang-hia, Shan-tung. U. S. Nat. Mus., Cat. No. 57916. 



Damesella sp. undt. (a) Walcott. 



10. Fragment of free cheek. Natural size. From Locality C46, Middle Cambrian, Ch'ang-hia lime- 



stone at Ch'au-mi-tien, Shan-tung. U. S. Nat. Mus., Cat. No. 57917- 



Damesella sp. undt. (b) Walcott. 



11. Free cheek, X 1.5, from same limestone as the specimen represented by fig. 10. (046). U.S. Nat. 



Mus., Cat. No. 57918. 



Damesella sp. undt. (c) Walcott (p. 128). 



12. Matrix of pygidium described. From Locality 3Bo, Middle Cambrian, Fu-ch6u series, Liau-tung, 



Manchuria. U. S. Nat. Mus., Cat. No. 57919. 



246 



