406 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 67 



PAGE 



Saukia pepinensis ( Owen) 381 



Fig. I. (Natural size.) The type cranidium of Owen from La Grange 

 Mountain, near Red Wing, Minnesota. U. S. National 

 Museum, Catalogue No. 17868. 

 This specimen is figured by Owen, 1852, pi. i, fig. ga. 



2 and 20. (Natural size.) Dorsal and side views of pygidium 



from Owen's collection, associated with the cranidium rep- 

 resented by fig. I. U. S. National Museum, Catalogue 

 No. 58629. 



3 and 3a. (Natural size.) Dorsal and side views of pygidium illus- 



trated by Owen, 1852, pi. i, fig. gb. U. S. National Museum, 

 Catalogue No. 17868. 



4 and 4a. (X I-5-) Dorsal and side views of a cranidium that is 



very slightly compressed. U. S. National Museum, Cata- 

 logue No. 58630. 



5. (Natural size.) A flattened cranidium, varying slightly in out- 



line of glabella and frontal rim from the type cranidium of 

 the species, fig. i. U. S. National Museum, Catalogue 

 No. 58631. 



6. (X 2.) Small pygidium enlarged for comparison with figs. 2 



and 3. U. S. National Museum, Catalogue No. 58632. 



7. (X 2.) Small cranidium enlarged for comparison with adults, 



figs. I, 4, and 5. U. S. National Museum, Catalogue 

 No. 58633. 



8. (Natural size.) A large cranidium showing entire palpebral 



lobe. U. S. National Museum, Catalogue No. 58634. 



9. (Natural size.) Matrix of free cheek with parts of doublure 



and genal spine. U. S. National Museum, Catalogue 

 No. 58635. 

 TO. (Natural size.) Free cheek. U. S. National Museum, Cata- 

 logue No. 58636. 



11. (X 2.) Thoracic segment. U. S. National Museum, Catalogue 



No. 58637. 



12, 12a, 13, and 130. (Natural size.) Dorsal and side views of two 



unusually perfect pygidia that vary slightly in details from 



figs. 2 and 3. U. S. National Museum, Catalogue Nos. 58638 



and 58639. 



The specimens represented by figs. 1-130 are from locality 113, 



Upper Cambrian : St. Lawrence formation at La Grange Mountain 



(or Barn Bluff), near Red Wing, Goodhue County, Minnesota. 



Saukia leucosia Walcott 379 



Figs. 14 and 14a. (Natural size.) Dorsal and side views of the type 

 specimen of the cranidium. U. S. National Museum, Cata- 

 logue No. 58640. 

 15. (Natural size.) Free cheek. U S. National Museum, Cata- 

 logue No. 58641. 



