408 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 68 



PAGE 



Conokephalina misa ( Hall) 387 



Fig. t. (Natural size.) Fragment of a cranidium showing frontal limb 

 and margin. U. S. National Museum, Catalogue No. 58661. 



2. (Natural size.) A cranidium showing general characters of the 



species. U. S. National Museum, Catalogue No. 58662. 



3. (Natural size.) Fragmentary pygidium associated with the 



cranidia represented by figs, i and 2. U. S. National 

 Museum, Catalogue No. 58663. 



The specimens represented by figs. 1-3 are from locality 83^ 

 Upper Cambrian : Green-sand horizon in the Franconia forma- 

 tion below the " fifth trilobite bed " of Owen, at Trempealeait, 

 Trempealeau County, Wisconsin. 



Osceolia osccola ( Hall ) 386 



Figs. 4 and 4a. (X i-5-) Dorsal and side views of cranidium. U. S. 



National Museum, Catalogue No. 58664. 

 5. (Natural size.) Free cheek. U. S. National ]\Iuseum, Cata- 

 logue No. 58665. 

 6 and 6a. (X 2.) Dorsal and side views of small cranidium. 



U. S. National Museum, Catalogue No. 58666. 

 7. (Natural size.) Cranidium with right free cheek attached. 



U. S. National Museum, Catalogue No. 58667. 

 8 and 9. (X 2.) Pygidia associated with cranidia represented by 



figs. 4 and 6. U. S. National Museum, Catalogue Nos. 58668 



and 58669. 

 ID. (Natural size.) Pygidium photographed from wax cast of 



natural matrix. U. S. National Museum, Catalogue 



No. 58670. 



The specimens represented by figs. 4-10 are from locality 78, 

 Upper Cambrian : St. Lawrence formation ; quarry near St. Croix 

 River, in suburbs of Osceola, Polk County, Wisconsin. 



« 



Calvinclla spiniger (Hall) 390 



Fig. II. (Natural size.) Cranidium with slender occipital spine. (83".) 

 U. S. National Museum, Catalogue No. 58648. 

 12. (Natural size.) Free cheek. (83^) U. S. National Museum, 



Catalogue No. 58649. 

 13- (X 1-25.) Nearly entire cranidium flattened in shaly sand- 

 stone. (83'.) U. S. National Museum, Catalogue 

 No. 58650. 



14. (Natural size.) Matrix of free cheek. (83^) U. S. National 



Museum, Catalogue No. 58651. 



15. (X 1-25.) Cranidium varying in details from figs. 11 and 13. 



(83'.) U. S. National Museum, Catalogue No. 58652. 



16. (X 1-25.) Pygidium flattened in shaly sandstone. (i35d.) 



U. S. National Museum, Catalogue No. 58653. 



