120 PROCEEDINGS OP THE NATIONAL MUSEUM vol.78 



Plate 8 



Pag- 

 Figure 1. Aluta eris (Walcott) 5' 



The imperfect type specimen, a right valve, X 10 



(after Walcott) . 

 Middle Cambrian: Shensi, China. 



2. Aluta fragilis (Walcott) 57 



The type, a right valve, X 6. 

 Middle Cambrian: Shensi, China. 

 3, 4. Aluta bergeroni (Walcott) 52 



3. Photograph of the type specimen, a left valve, X 5. 



4. A drawing of the same specimen, X 10 (after Walcott). 

 Middle Cambrian: Shensi, China. 



5, 6. Aluta enyo (Walcott) 54 



5. Photograph of the type specimen, a left valve, X 5. 



6. Drawing of the same specimen, X 10 (after Walcott). 

 Middle Cambrian: Shensi, China. 



7,8. Aluta woodi (Walcott) 56 



7. Photograph of the type specimen, a left valve, X 6. 



8. Drawing of the same specimen, X 10 (after Walcott). 

 Middle Cambrian: Shensi, China. 



9, 10. Aluta stereope (Walcott) 55 



9. View of the type specimen, a right valve, X 5. 

 10. Drawing of the same, X 10 (after Walcott). 

 Middle Cambrian: Shensi, China. 



11, 12. Aluta primordialis (Linnarsson) 59 



View of a left valve and cardinal edge view of the same, 



X 2 (after Linnarsson). 

 Middle Cambrian: Vestergotland, Sweden. 



13,14. Aluta flexilis Matthew 62 



13. Matthew's figure of this species, X 6. 



14. Drawing of the same specimen properly oriented and 



with the matrix cleared away, X 4. 

 Middle Cambrian (Acadian, Clcl): Porter's Brook, St. 

 Martins, New Brunswick. 



15-17. Aluta troyensis (Ford) 58 



16. Sketch of Ford's type, X 3, a right valve. 

 Lower Cambrian: Troy. N. Y. 



16. Cast of a left valve, X 2. (15, 16, after Walcott). 



17. Photograph of the same specimen, X 4. 

 Lower Cambrian: Washington County, N. Y. 



18, 19. Ahita rot undata (Walcott) 60 



18. Drawing of a right valve, X 2}^ (after Walcott). 



19. Photograph of a left valve. X 4. 



Lower Cambrian: Washington Countv, N. Y. 



